Introduction to Modern Mathematical Modeling with R:

A User’s Manual to Train Mathematical Consultants

 

A Cambridge University Press book by

SSP Shen

 

 

R Code written by Dr. Samuel Shen, Distinguished Professor
San Diego State University, California, USA
https://shen.sdsu.edu
Email:

 

Compiled and Edited by Joaquin Stawsky
San Diego State University, August 2022

 

 

 

Chapter 5: Mathematical Modeling By Linear Algebra

Kirchhoff’s Laws and Solution of an Electric Circuit

#Step 4: Solution to the mathematical model equations
a <- matrix(c(1,8,0,-1,0,6,1,-3,3), 
            nrow=3, ncol=3) 
b <- matrix(c(0,10,15), 
            nrow=3, ncol=1)
solve(a, b)
##           [,1]
## [1,] 1.5000000
## [2,] 2.1666667
## [3,] 0.6666667
#Step 5: Interpretation of the Modeling Results
c <- solve(a, b)
a %*% c #verify the solution: a*c = b 
##              [,1]
## [1,] 1.110223e-16
## [2,] 1.000000e+01
## [3,] 1.500000e+01

 

Leontief Production Model: A Balance of Output and Input

B <- matrix(c(1-0.3, -0.2, -0.3,
              -0.2, 1-0.2, -0.2,
              -0.2, -0.1, 1-0.3), nrow=3, ncol=3)
D <- matrix(c(3000, 500, 1500), nrow=3, ncol=1) 
solve(B, D)
##          [,1]
## [1,] 6875.000
## [2,] 3090.278
## [3,] 5972.222
I <- diag(3) #3-dim identity matrix
A <- matrix(c(0.4102, 0.0301, 0.0257,
              0.0624, 0.3783, 0.1050,
              0.1236, 0.1588, 0.1919),
            byrow = TRUE, nrow = 3)
D <- c(39.24,60.02,130.65)
solve(I-A, D)
## [1]  82.40041 138.85497 201.56523

 

The Fundamental Idea of SVD: Space-Time-Energy Separation

SVD demo for generated data: A = UDV’

#Demonstrate SVD for a simple 2X3 matrix 
a1 <- matrix(c(1,1,0,
               -1,-1,0),
             nrow=2) 
a1
##      [,1] [,2] [,3]
## [1,]    1    0   -1
## [2,]    1   -1    0
svda1 <- svd(a1) 
U <- svda1$u 
DE <- svda1$d 
V <- svda1$v
U
##            [,1]       [,2]
## [1,] -0.7071068 -0.7071068
## [2,] -0.7071068  0.7071068
V
##            [,1]          [,2]
## [1,] -0.8164966  1.110223e-16
## [2,]  0.4082483 -7.071068e-01
## [3,]  0.4082483  7.071068e-01
DE
## [1] 1.732051 1.000000
D <- diag(DE) #forms the SVD diagonal matrix 

#Verification of SVD: A = UDV'
#round() removes decimal places
#This yields the original data matrix a1
round(U%*%D%*%t(V)) 
##      [,1] [,2] [,3]
## [1,]    1    0   -1
## [2,]    1   -1    0
#Graphically show the U column vectors, aka EOFs
#Figure 5.2
par(mar=c(1,0,0.5,0.5))
#plot.new()
#par(mfrow = c(2,2), byrow = TRUE) 
layout(matrix(c(1,2,3,4), nrow=2, byrow = TRUE) )
par(mgp=c(2,1,0), mar=c(4,4,3,1)) 

plot(NULL,
     xlim = c(0.5, 2.5),
     ylim = c(-2,2),
     xaxt = "n", yaxt = "n",
     xlab="", ylab="",
     bty = 'n',
     main="EOF1 = U[,1]")
points(1, 0, pch = 16, 
       cex=5*0.707, col = 'blue')
text(1, -1.2, 'Spatial1', cex =1.3)
text(1, 1.2, '-0.707', cex =1.3)
points(2,0, pch = 16, 
       cex=5*0.707, col = 'blue')
text(2, -1.2, 'Spatial2', cex =1.3)
text(2, 1.2, '-0.707', cex =1.3)

par(mgp=c(2,1,0),mar=c(4,4,3,1))
plot(1:3, V[,1],
     type = 'o',
     xlim = c(1, 3),
     ylim = c(-1,1),
     xlab="Time", ylab="Scale",
     bty = 'n',
     main="PC1 = V[,1]")
grid(nx = NULL, ny = NULL)

par(mgp=c(2,1,0),mar=c(4,4,3,1))
plot(NULL,
     xlim = c(0.5, 2.5),
     ylim = c(-2,2),
     xaxt = "n", yaxt = "n",
     xlab="", ylab="",
     bty = 'n',
     main="EOF2 = U[,2]")
points(1, 0, pch = 16, 
       cex=5*0.707, col = 'blue')
text(1, -1.2, 'Spatial1', cex =1.3)
text(1, 1.2, '-0.707', cex =1.3)
points(2,0, pch = 16, 
       cex=5*0.707, col = 'red')
text(2, -1.2, 'Spatial2', cex =1.3)
text(2, 1.2, '0.707', cex =1.3)

par(mgp=c(2,1,0),mar=c(4,4,3,1))
plot(1:3, V[,2],
     type = 'o',
     xlim = c(1, 3),
     ylim = c(-1,1),
     xlab="Time", ylab="Scale",
     bty = 'n',
     main="PC2 = V[,2]")
grid(nx = NULL, ny = NULL)

 

Example: 5.2

#SVD demo for generated data

#Generate random data on a 10-by-15 grid with 20 time points 
#SVD for 2D spatial dimension and 1D time rm(list=ls())
#remove the R console history
dat <- matrix(rnorm(10*15*20),ncol=20)
x <- 1:10
y <- 1:15
udv <- svd(dat) 
U <- udv$u 
D <- udv$d 
V <- udv$v

dim(U)
## [1] 150  20
dim(V)
## [1] 20 20
length(D)
## [1] 20
#Plot spatial pattern for EOF1 
umat <- matrix(U[,1],nrow=15) 
dim(umat)
## [1] 15 10
#Figure 5.3
plot.new() 
#start a new figure from blank 
par(mar=c(4.5,4.5,2,1))
filled.contour(x, y, t(umat),key.title = title(main = "Scale"),
               plot.axes = {axis(1,seq(0,10, by = 2), cex.axis=1.3) 
                 axis(2,seq(2, 15, by = 3), cex.axis=1.3)},
               plot.title = title(main = "Spatial Pattern: EOF1", 
                                  xlab="Spatial x Position: 1 to 10",
                                  ylab="Spatial y Position: 1 to 15", 
                                  cex.lab=1.5),
               color.palette = colorRampPalette(
                 c("red", "white", "blue")))

#Plot time pattern PC1
par(mfrow=c(1,1))
par(mar=c(4,4,2,1))
plot(1:20, V[,1],type="o",col="red",lwd=2,
     main="Temporal Pattern: Time Series",xlab="Time", 
     ylab="PC1 Values [Dimensionless]",cex.lab=1.3, cex.axis=1.3)
grid(nx = NULL, ny = NULL)

 

SVD Analysis for El Niño Southern Oscillation Data

#setwd("~/sshen/mathmodel")
Pta <- read.table("~/Desktop/RMathModel/data/PSTANDtahiti.txt", header=F)
# Remove the first column that is the year
ptamon <- Pta[,seq(2,13)]
#Convert the matrix into a vector according to months: Jan 1951, Feb 1951,
# ..., Dec 2015
ptamonv <- c(t(ptamon))
xtime <- seq(1951, 2016-1/12, 1/12)

# Figure 5.4
# Plot the Tahiti standardized SLP anomalies
plot(xtime, ptamonv,type="l",xlab="Year",ylab="Pressure",
     main="Standardized Tahiti SLP Anomalies", col="red",
     xlim=range(xtime), ylim=range(ptamonv))
grid(nx = NULL, ny = NULL)

# Do the same for Darwin SLP
Pda <- read.table("~/Desktop/RMathModel/data/PSTANDdarwin.txt", header=F)
pdamon <- Pda[,seq(2,13)]
pdamonv <- c(t(pdamon))
plot(xtime, pdamonv,type="l",xlab="Year",ylab="Pressure",
     main="Standardized Darwin SLP Anomalies", col="blue",
     xlim=range(xtime), ylim=range(pdamonv))
grid(nx = NULL, ny = NULL)

#Plot the SOI index
plot(xtime, ptamonv-pdamonv,type="l",xlab="Year",
     ylab="SOI Index", col="black",xlim=range(xtime), ylim=c(-4,4), lwd=1)
grid(nx = NULL, ny = NULL)
#Add ticks on top edge of the plot box
axis(3, at=seq(1951,2015,4), labels=seq(1951,2015,4))
# Add ticks on the right edge of the plot box
axis(4, at=seq(-4,4,2), labels=seq(-4,4,2))
# If put a line on a plot, use the command below
lines(xtime,ptamonv-pdamonv,col="black", lwd=1)

cnegsoi <- -cumsum(ptamonv-pdamonv)
plot(xtime, cnegsoi,type="l",xlab="Year",ylab="Negative CSOI Index",
     col="black",xlim=range(xtime), ylim=range(cnegsoi), lwd=1)
grid(nx = NULL, ny = NULL)

#Time-space data format
ptada <- cbind(ptamonv,pdamonv)
#Space-time data format
ptada <- t(ptada)
dim(ptada)
## [1]   2 780
svdptd <- svd(ptada)
# Verify that recontd = ptada
recontd <- svdptd$u%*%diag(svdptd$d[1:2])%*%t(svdptd$v)
recontd
##      [,1]          [,2] [,3] [,4] [,5] [,6] [,7] [,8] [,9] [,10] [,11] [,12]
## [1,]  1.3  1.110223e-16 -1.4 -0.9 -0.7 -1.3 -1.8 -0.5 -1.5  -1.0  -0.7   0.1
## [2,] -1.3 -1.600000e+00 -1.2 -0.4  0.4 -1.6 -0.1 -0.2  0.2   0.6   0.5   1.4
##      [,13] [,14] [,15] [,16] [,17] [,18] [,19] [,20] [,21] [,22] [,23] [,24]
## [1,]  -1.5  -0.8   0.8   0.0   0.2   0.8   0.4  -0.6  -0.5  -0.1  -1.1  -1.1
## [2,]   0.0   0.2   0.0   0.4  -1.1  -0.4  -0.4  -0.7  -0.1  -0.8  -1.1   0.9
##      [,25] [,26] [,27] [,28] [,29] [,30] [,31] [,32] [,33] [,34]         [,35]
## [1,]   0.7  -0.4  -0.6  -0.6  -1.3  -0.2   0.4  -2.3  -1.2   0.1 -2.775558e-17
## [2,]   0.2   0.4  -0.3  -0.9   1.5  -0.4   0.4  -0.3   0.9   0.0  5.000000e-01
##      [,36] [,37] [,38] [,39] [,40] [,41] [,42] [,43] [,44]         [,45] [,46]
## [1,]  -0.1  -0.5   0.0  -0.1  -0.9  -0.5  -0.4  -0.3   0.4  2.775558e-17   0.4
## [2,]   0.6  -1.6   0.4  -0.6  -2.0  -1.3  -0.6  -0.9  -1.4 -3.000000e-01  -0.1
##      [,47] [,48] [,49] [,50] [,51] [,52] [,53] [,54] [,55] [,56] [,57] [,58]
## [1,]   0.4   1.5   0.6   0.3  -0.4  -1.1  -0.2   0.3   1.0   0.6   0.9   1.2
## [2,]   0.2  -0.8   1.5  -2.8  -1.5  -0.9  -1.9  -1.8  -1.6  -1.8  -1.2  -1.3
##      [,59] [,60] [,61] [,62] [,63] [,64] [,65] [,66] [,67] [,68] [,69] [,70]
## [1,]   0.9   1.8   0.5   0.7   0.9   0.1   0.2   0.3  -0.2   0.3  -0.7     2
## [2,]  -1.2   0.2  -1.7  -1.9  -1.3  -1.4  -2.2  -1.5  -2.0  -1.7  -0.8    -1
##      [,71] [,72] [,73] [,74] [,75] [,76] [,77] [,78] [,79] [,80] [,81] [,82]
## [1,]   0.1   0.1   0.8  -0.5  -0.1   0.1  -0.4  -0.1  -0.1  -0.9  -0.7   0.7
## [2,]  -0.2  -1.6  -0.2  -0.4  -0.5  -0.4   0.7  -0.4  -0.5  -0.1   0.8   0.7
##      [,83] [,84] [,85] [,86] [,87] [,88] [,89] [,90] [,91] [,92] [,93] [,94]
## [1,]  -0.8  -0.2  -1.5  -0.6   0.2  -0.3  -1.3  -0.8  -0.3  -0.1  -1.2  -0.9
## [2,]   0.8   0.3   1.7   0.2  -0.2  -0.9  -0.5  -1.2  -0.9  -1.6  -0.7  -1.1
##      [,95] [,96] [,97] [,98] [,99] [,100] [,101] [,102] [,103] [,104] [,105]
## [1,]  -0.6  -0.2  -2.0  -0.6   0.8   -0.2   -0.2   -0.3   -0.4   -0.4   -0.3
## [2,]   0.2   0.8  -0.5   1.7  -1.3   -0.9   -1.0   -0.1    0.1   -0.3   -0.3
##      [,106] [,107] [,108] [,109] [,110] [,111] [,112] [,113] [,114] [,115]
## [1,]    0.6    0.4    0.3    0.1    0.0    0.6    0.1   -0.5   -0.2    0.0
## [2,]   -0.2   -1.1   -1.2   -0.2   -0.1   -1.1   -1.3   -1.4   -0.4   -0.8
##      [,116] [,117] [,118] [,119] [,120] [,121] [,122] [,123] [,124] [,125]
## [1,]    0.5   -0.5    0.1    0.7    1.1    0.1    1.1   -1.8    0.7    0.2
## [2,]   -0.8   -1.6   -0.1   -0.2   -0.2    0.5   -0.4    1.1   -0.6   -0.4
##      [,126] [,127] [,128] [,129] [,130] [,131] [,132] [,133]        [,134]
## [1,]    0.0    0.1    0.1    0.0   -0.9    1.1    1.8    1.8 -2.775558e-17
## [2,]   -0.1   -0.3   -0.2   -0.1   -0.3    0.3   -0.6   -1.4  5.000000e-01
##      [,135] [,136] [,137] [,138] [,139] [,140] [,141] [,142] [,143] [,144]
## [1,]    0.3    0.2    0.5   -0.1   -0.9    1.0   -0.3    0.7   -0.2    0.2
## [2,]    0.1   -0.1   -1.3   -1.3   -1.0   -0.1   -1.0   -1.0   -0.7   -0.1
##      [,145] [,146] [,147] [,148] [,149] [,150] [,151] [,152] [,153] [,154]
## [1,]    1.0    2.0    0.4    0.1   -0.5   -0.5   -0.1   -0.9   -0.6   -0.5
## [2,]   -0.7    1.1   -1.5   -1.3   -1.1    0.3    0.1   -0.9    0.4    1.5
##      [,155] [,156]        [,157] [,158] [,159] [,160] [,161] [,162] [,163]
## [1,]   -0.1   -0.6 -5.551115e-17    0.3    0.7    1.1   -0.5    0.2   -0.4
## [2,]    1.3    1.5  6.000000e-01    0.2   -1.2   -0.7   -0.9   -1.0   -1.3
##      [,164] [,165] [,166] [,167] [,168] [,169] [,170] [,171] [,172]
## [1,]    1.3    0.4    1.0   -0.7   -0.3   -1.0   -0.3   -0.1    0.3
## [2,]   -1.2   -1.7   -1.1   -1.0    0.2   -0.3   -1.0   -1.3    1.2
##             [,173]        [,174] [,175] [,176] [,177] [,178] [,179] [,180]
## [1,]  2.775558e-17 -5.551115e-17   -1.1   -0.8   -1.2    0.0   -1.1   -0.4
## [2,] -3.000000e-01  1.000000e+00    1.9    0.3    1.0    1.5    1.4   -0.7
##      [,181] [,182] [,183]        [,184] [,185] [,186] [,187] [,188] [,189]
## [1,]   -1.5   -0.5   -1.3 -3.000000e-01    0.1    0.8   -0.4    0.4   -0.5
## [2,]    0.7   -0.1    0.2  2.775558e-17    0.7    0.3   -0.5   -0.7   -0.1
##      [,190] [,191] [,192] [,193] [,194] [,195] [,196] [,197] [,198] [,199]
## [1,]    0.3      0   -0.4    1.3    1.6      1    0.7   -0.5    0.7   -0.3
## [2,]    0.5      0    0.2   -1.5   -1.1     -1    0.7   -0.4   -0.4   -0.6
##      [,200] [,201] [,202]        [,203] [,204] [,205] [,206] [,207] [,208]
## [1,]    0.7    1.2    0.1 -7.000000e-01   -0.6   -1.5    0.6    0.0   -0.1
## [2,]   -0.5    0.4    0.0 -5.551115e-17    0.4   -2.3   -1.6   -0.1   -0.2
##      [,209] [,210] [,211] [,212]        [,213] [,214] [,215] [,216] [,217]
## [1,]    0.3    1.1    0.4   -0.2 -5.000000e-01    0.1    0.2    0.2   -3.2
## [2,]   -1.8   -0.7   -0.7   -0.6 -2.775558e-17    0.2    0.8   -0.1   -0.8
##      [,218]       [,219] [,220] [,221] [,222] [,223] [,224] [,225] [,226]
## [1,]   -1.4 7.000000e-01    0.3   -0.8    0.1   -0.7   -0.2   -2.0   -0.9
## [2,]   -0.5 5.551115e-17    0.9   -0.4   -0.2    0.1    0.0   -0.4    0.7
##      [,227] [,228] [,229] [,230] [,231] [,232] [,233] [,234] [,235] [,236]
## [1,]    0.1    0.2   -0.5   -1.4   -0.1    0.0   -0.2    0.6   -0.3   -0.3
## [2,]    0.2   -0.4    1.4    0.3   -1.0    0.1   -0.8   -1.0    0.3   -1.3
##             [,237] [,238] [,239] [,240] [,241] [,242] [,243] [,244] [,245]
## [1,]  1.110223e-16   -0.1    1.3    1.2   -0.2    1.2    1.7    1.1    0.4
## [2,] -1.900000e+00   -1.9   -1.3   -2.0   -0.8   -2.1   -2.1   -1.7   -1.0
##      [,246] [,247] [,248] [,249] [,250] [,251] [,252] [,253] [,254] [,255]
## [1,]    0.7   -0.5    1.0    1.0    1.6    0.3   -1.0    0.0    0.2   -0.4
## [2,]    0.1   -0.8   -1.5   -1.3   -1.1   -0.5   -1.4   -0.8   -1.6   -1.5
##      [,256] [,257] [,258] [,259] [,260] [,261] [,262] [,263] [,264] [,265]
## [1,]    0.4   -0.6   -1.0   -2.1   -0.4   -0.9    0.2    0.2   -0.1    0.1
## [2,]    0.6    2.0   -0.1    0.3    0.4    1.3    1.7    0.8    2.0    0.6
##      [,266] [,267] [,268] [,269]        [,270] [,271] [,272] [,273] [,274]
## [1,]   -0.9   -0.1   -0.7    0.1  1.110223e-16    0.1    0.4    1.2    0.6
## [2,]    1.3   -1.2   -0.8   -0.6 -1.800000e+00   -0.9   -1.7   -0.8   -0.7
##      [,275] [,276] [,277] [,278] [,279] [,280] [,281] [,282] [,283] [,284]
## [1,]    1.4    2.3    1.6    1.2    1.4    0.6    1.1    0.2    1.1    0.2
## [2,]   -2.9   -0.7   -2.4   -2.2   -2.6   -1.0   -0.4   -0.5   -0.8   -1.2
##      [,285] [,286] [,287] [,288] [,289] [,290] [,291] [,292] [,293] [,294]
## [1,]    0.7    0.5   -1.3   -0.8   -1.1    1.4    1.0    0.1    0.1    0.7
## [2,]   -1.1   -1.1   -1.1   -1.2   -0.3    0.1   -1.6   -1.9   -1.0   -1.4
##      [,295] [,296] [,297] [,298] [,299] [,300] [,301] [,302] [,303]
## [1,]    1.6    1.4    1.7    1.1    1.1    1.7    0.8    1.5    0.4
## [2,]   -1.6   -1.9   -1.7   -1.7   -0.8   -1.7   -1.4   -1.3   -2.5
##            [,304] [,305] [,306] [,307] [,308] [,309] [,310] [,311] [,312]
## [1,] 5.000000e-01    1.1    0.1   -0.9   -0.6   -1.3   -0.1    0.2   -1.4
## [2,] 2.775558e-17    0.5   -0.3    0.5    0.7    0.6   -0.8   -1.0   -0.8
##      [,313] [,314] [,315] [,316] [,317] [,318] [,319] [,320] [,321] [,322]
## [1,]   -1.4    0.9   -1.1   -1.2   -1.0   -1.0   -1.7   -1.1   -0.7   -0.3
## [2,]   -0.7   -1.1   -0.2   -0.5   -0.2    0.5    0.2    0.2    0.6    1.4
##      [,323] [,324] [,325] [,326] [,327] [,328] [,329] [,330] [,331] [,332]
## [1,]   -1.1   -1.1    0.8   -2.5    0.7   -0.3    0.3   -0.6   -1.0   -0.6
## [2,]    1.0    0.6    1.4    1.9    1.1    0.2   -2.0   -1.7   -1.9   -1.3
##      [,333] [,334] [,335] [,336] [,337] [,338] [,339] [,340] [,341] [,342]
## [1,]   -0.5   -0.7    0.2   -0.1   -1.3    1.6   -0.2   -0.4    0.5    0.7
## [2,]   -0.6   -0.1    0.2    0.0   -0.6    0.1   -0.4   -0.2   -0.3   -0.3
##      [,343] [,344] [,345] [,346] [,347] [,348]        [,349]        [,350]
## [1,]    0.1   -0.4   -0.3    0.0   -0.6   -0.2  5.551115e-17  2.775558e-17
## [2,]   -2.1   -0.1   -0.5    0.2    0.2    1.0 -7.000000e-01 -5.000000e-01
##      [,351] [,352] [,353] [,354] [,355]        [,356] [,357] [,358] [,359]
## [1,]   -1.7   -1.2   -0.2   -0.4   -0.3  6.000000e-01   -0.4   -0.1   -0.4
## [2,]   -1.0   -0.2   -0.2   -0.4   -0.2 -5.551115e-17    0.4   -0.1    0.2
##      [,360] [,361] [,362] [,363] [,364] [,365] [,366] [,367] [,368] [,369]
## [1,]   -0.2   -0.8   -0.8   -0.7   -0.2    0.4    0.7   -0.1    0.3   -0.1
## [2,]   -0.1   -1.4   -0.6    1.4    0.0   -0.9   -1.3   -1.5   -0.9   -0.7
##      [,370] [,371] [,372] [,373] [,374] [,375] [,376] [,377] [,378] [,379]
## [1,]   -0.3   -0.2    0.9    1.6    0.6    0.2    0.3   -0.2   -0.8   -1.5
## [2,]    0.3   -0.5    0.1   -0.3    0.2   -0.8    0.2    0.4    0.9    1.0
##      [,380] [,381] [,382] [,383] [,384] [,385] [,386] [,387] [,388] [,389]
## [1,]   -1.7   -1.3   -1.2   -2.3   -2.0   -3.0   -2.9   -2.4   -1.3    1.1
## [2,]    1.2    1.6    1.6    2.0    1.7    2.8    3.1    1.6    0.2    0.2
##      [,390] [,391] [,392] [,393] [,394] [,395] [,396] [,397]        [,398]
## [1,]    0.4   -0.1    0.9    1.3    0.5    0.5      1    0.7  1.110223e-16
## [2,]    0.3    0.9    0.7   -0.1   -0.2    0.7      1    0.4 -1.400000e+00
##      [,399] [,400] [,401] [,402] [,403] [,404] [,405] [,406] [,407] [,408]
## [1,]   -0.6    0.8    0.0   -0.3    0.1   -0.4   -0.2   -0.1    0.8   -2.2
## [2,]   -0.2    0.2   -0.4    0.2   -0.2   -1.1   -0.4    0.5    0.4   -2.1
##      [,409] [,410] [,411] [,412] [,413] [,414] [,415] [,416] [,417] [,418]
## [1,]    0.2    0.7   -0.8   -0.2   -1.2   -0.9    0.0    0.7   -0.7   -0.7
## [2,]    0.7   -1.3   -2.0   -2.2   -1.9   -0.3    0.2   -0.9   -0.7   -0.1
##      [,419] [,420] [,421] [,422] [,423]        [,424] [,425] [,426] [,427]
## [1,]   -0.7    0.6   -0.2   -1.6    0.8  2.775558e-17   -0.3   -0.1   -0.1
## [2,]   -0.5    0.2   -1.8    0.1    0.1 -5.000000e-01    0.1   -1.8   -0.6
##      [,428] [,429] [,430] [,431] [,432] [,433] [,434] [,435] [,436] [,437]
## [1,]   -1.9   -0.8    1.2   -1.6   -0.3   -0.7   -1.6    0.0   -0.8   -1.1
## [2,]   -1.3    0.0    0.1    0.4    2.1    0.4    0.5    2.1    1.5    1.0
##      [,438] [,439] [,440] [,441] [,442] [,443] [,444] [,445] [,446] [,447]
## [1,]   -1.6   -1.1   -0.7   -0.6   -0.2      0   -0.4    0.8   -0.8   -0.3
## [2,]    0.2    1.1    0.8    1.1    0.4      0    0.4    1.0   -0.1   -1.4
##      [,448] [,449] [,450] [,451] [,452] [,453] [,454] [,455] [,456] [,457]
## [1,]    0.4    0.9    1.0    1.1    1.7    1.5    0.8    1.4    1.2    1.4
## [2,]    0.2   -0.6    0.9   -0.6   -0.8   -1.5   -1.5   -1.4   -0.8   -1.2
##            [,458] [,459] [,460] [,461] [,462] [,463] [,464] [,465] [,466]
## [1,] 2.000000e+00    0.8    0.6    0.8    1.1    0.2   -0.5    0.3    0.5
## [2,] 1.110223e-16   -0.9   -2.1   -1.3   -0.1   -1.2   -0.1   -0.5   -0.8
##      [,467] [,468] [,469] [,470] [,471] [,472] [,473]        [,474] [,475]
## [1,]   -0.6    0.5    0.1   -0.1   -0.8    0.1    0.9  2.775558e-17    0.3
## [2,]   -0.2    1.4    0.2    2.9    0.0   -0.2   -1.1 -5.000000e-01   -0.6
##      [,476] [,477] [,478] [,479] [,480] [,481] [,482] [,483]        [,484]
## [1,]   -0.2   -0.2    0.6   -0.6   -0.1    0.7    0.1   -0.1 -1.000000e+00
## [2,]    0.1    1.0    0.1    0.2    0.3   -0.3   -0.3    1.1 -5.551115e-17
##      [,485] [,486] [,487] [,488] [,489] [,490]        [,491] [,492] [,493]
## [1,]   -0.7    0.1      0   -0.1   -1.5   -1.4 -1.110223e-16   -1.9   -1.6
## [2,]    1.0    0.3      0    0.6    1.0    0.3  1.100000e+00    1.0    3.1
##      [,494] [,495] [,496] [,497] [,498] [,499] [,500] [,501] [,502] [,503]
## [1,]   -0.7   -1.4   -0.7    0.1   -1.4    0.3    0.1   -0.8   -1.9   -0.6
## [2,]    0.8    2.0    1.0   -0.4   -0.4    1.3   -0.5   -0.9    0.4    0.5
##      [,504] [,505] [,506] [,507] [,508] [,509] [,510] [,511] [,512] [,513]
## [1,]   -1.0   -1.4   -1.6    0.8   -0.6    0.3   -0.5   -1.3    0.0   -0.1
## [2,]   -0.1    0.1   -0.4    1.6    1.4    0.8    0.9    0.1    1.6    1.1
##      [,514] [,515] [,516] [,517] [,518] [,519] [,520] [,521] [,522] [,523]
## [1,]   -0.7    0.0    0.0   -0.2    0.1   -0.1   -1.3   -0.6   -0.8   -1.6
## [2,]    1.1    0.1   -0.4    0.0   -0.3    1.0    0.8    0.5    0.0    0.6
##      [,524] [,525] [,526] [,527] [,528] [,529] [,530] [,531] [,532] [,533]
## [1,]   -0.6   -1.5   -0.9   -0.1   -0.3   -0.4    0.7    0.2   -1.4   -0.5
## [2,]    1.4    1.1    1.0    0.8    1.7    0.3    0.9   -1.0   -0.3    0.1
##      [,534] [,535] [,536] [,537] [,538] [,539] [,540] [,541] [,542] [,543]
## [1,]    0.3    0.1    0.4    0.2   -0.5    0.0   -0.7    0.8   -0.1    1.0
## [2,]    0.1   -0.7   -0.2   -0.2   -0.5   -0.1    0.1   -0.9   -0.6   -0.8
##      [,544] [,545] [,546] [,547] [,548] [,549]        [,550] [,551] [,552]
## [1,]    0.5    1.1    1.5    0.2    0.4   -0.7  5.551115e-17   -0.6   -0.1
## [2,]   -0.8    0.6   -0.5   -0.8   -0.9   -1.8 -1.000000e+00   -0.5   -1.6
##      [,553] [,554] [,555] [,556] [,557] [,558] [,559] [,560] [,561] [,562]
## [1,]    1.4    1.0   -0.5    0.8   -1.8   -0.7   -0.5   -0.8   -0.1   -0.1
## [2,]    0.6   -1.8    0.2    1.8    0.4    1.6    0.8    1.6    2.2    2.4
##      [,563] [,564] [,565] [,566] [,567] [,568] [,569] [,570] [,571] [,572]
## [1,]    0.2   -0.5   -3.4   -0.3   -2.5   -1.3    0.4    0.8    1.2    1.3
## [2,]    2.3    1.1    1.0    3.1    1.5    1.1    0.0   -0.8   -0.8   -0.6
##      [,573] [,574] [,575] [,576] [,577] [,578] [,579] [,580] [,581] [,582]
## [1,]    1.1    0.7    0.2    0.9    1.4    1.0    0.3    1.2    1.0    0.6
## [2,]   -0.6   -1.1   -1.5   -1.4   -1.6   -0.6   -1.8   -1.1    0.6    0.2
##      [,583] [,584] [,585] [,586] [,587] [,588]        [,589] [,590] [,591]
## [1,]    0.7    1.1    0.1    1.2    0.9    1.6  1.100000e+00    2.5    1.4
## [2,]   -0.2    0.6    0.1   -0.4   -0.8   -0.7 -2.220446e-16   -0.2   -0.8
##      [,592] [,593] [,594] [,595] [,596] [,597] [,598] [,599] [,600] [,601]
## [1,]    0.8    0.8    0.2   -0.6    0.1    1.2    0.3    0.9   -0.9    2.1
## [2,]   -1.2    0.2    0.5   -0.3   -1.1   -0.2   -1.5   -2.2   -2.3    0.5
##      [,602] [,603] [,604] [,605] [,606] [,607] [,608] [,609] [,610] [,611]
## [1,]   -0.2    1.1   -0.1   -0.2   -0.1   -0.4   -0.8   -0.1   -0.9    0.7
## [2,]   -3.0   -0.4   -0.4    0.6   -0.7    0.0   -0.1   -0.4   -0.8   -0.5
##      [,612] [,613] [,614] [,615] [,616] [,617] [,618] [,619] [,620] [,621]
## [1,]   -1.1    1.2    1.5    0.3    0.0   -0.8   -0.2    0.2   -1.3   -0.3
## [2,]    0.3    0.5   -0.2    0.7    0.1    0.6    0.2    1.1    0.3    0.7
##      [,622] [,623] [,624] [,625] [,626] [,627] [,628]        [,629] [,630]
## [1,]   -0.9    0.1   -0.3   -0.1   -1.3   -0.3    0.3 -5.000000e-01   -0.9
## [2,]   -0.2    0.8    1.5    0.2   -0.2    0.1    0.6 -2.775558e-17    0.1
##            [,631] [,632] [,633] [,634] [,635] [,636] [,637] [,638] [,639]
## [1,] 5.000000e-01   -0.2   -0.3   -0.4   -0.1    0.8   -1.4    1.5   -0.7
## [2,] 2.775558e-17   -0.3   -0.1   -0.4    0.4   -1.1    0.8   -0.6   -1.4
##      [,640] [,641]        [,642] [,643] [,644] [,645] [,646] [,647] [,648]
## [1,]   -0.8    0.9 -1.110223e-16   -0.4   -0.4    0.2    0.2   -0.8   -1.4
## [2,]    0.6   -0.8  1.400000e+00    0.4    0.1    0.8    0.3    0.3   -0.1
##      [,649] [,650] [,651] [,652] [,653] [,654] [,655] [,656] [,657] [,658]
## [1,]    0.2   -3.2    0.7    0.1   -0.5    0.0    0.1   -0.4    0.3    1.2
## [2,]   -0.3    2.0    0.1    1.1    0.7   -0.8   -0.2    0.1   -0.3   -0.8
##      [,659] [,660] [,661] [,662] [,663] [,664] [,665] [,666] [,667] [,668]
## [1,]   -0.8    0.2    0.9    0.7    1.0   -0.2   -0.3    0.1   -0.1   -0.6
## [2,]   -0.5    0.3   -1.8    0.5   -1.9   -2.0    0.6    0.5    0.9    1.1
##             [,669] [,670] [,671] [,672]        [,673] [,674] [,675] [,676]
## [1,] -5.551115e-17   -0.1    1.0    0.7 -1.300000e+00    0.1   -0.2    0.4
## [2,]  1.000000e+00    1.9    0.8    1.2  1.110223e-16    0.2   -0.6    0.6
##      [,677] [,678] [,679]       [,680] [,681] [,682] [,683] [,684] [,685]
## [1,]    0.1   -0.4    0.2 7.000000e-01   -0.4    0.5    0.2    1.5    1.3
## [2,]    0.3   -1.3    0.7 5.551115e-17   -0.7   -0.7   -1.2   -1.3   -1.6
##      [,686] [,687]        [,688] [,689] [,690] [,691] [,692] [,693] [,694]
## [1,]    2.4    2.4  1.100000e+00    0.5    1.1    0.4    1.8    1.6    2.3
## [2,]   -1.9    0.1 -2.220446e-16    0.6    0.2    0.0    0.1   -0.5    0.2
##      [,695] [,696] [,697] [,698] [,699] [,700] [,701] [,702] [,703] [,704]
## [1,]    1.5    1.6    1.2    1.6    0.8    0.8   -1.0    0.0    0.1   -0.7
## [2,]   -0.7   -0.8   -0.6   -1.5    0.1   -0.5   -0.8   -0.2   -0.3   -0.4
##      [,705] [,706]        [,707] [,708] [,709] [,710] [,711] [,712] [,713]
## [1,]   -0.3   -1.4 -1.000000e+00   -0.7   -2.5   -1.6   -0.6    1.7    0.3
## [2,]   -0.8    0.6 -5.551115e-17    0.5   -0.7    0.9    0.5   -0.3   -1.2
##      [,714] [,715] [,716] [,717] [,718] [,719] [,720] [,721] [,722] [,723]
## [1,]    0.8    2.0    1.9    2.4    1.5    1.8    2.5    2.4    2.9    2.3
## [2,]    0.2   -0.9   -1.1   -1.3   -1.3   -0.4   -2.3   -1.4   -1.7   -1.8
##      [,724] [,725] [,726] [,727] [,728] [,729] [,730] [,731] [,732] [,733]
## [1,]    2.2    1.1    0.9    1.4    0.9    2.0    0.8    1.5    1.9    1.2
## [2,]   -0.9    0.5    0.5   -0.2    0.2    0.3   -0.4   -0.3   -2.2   -0.6
##      [,734] [,735] [,736] [,737] [,738] [,739] [,740]        [,741]
## [1,]    1.1   -0.7    0.3   -0.1   -0.4   -0.6    0.3  3.000000e-01
## [2,]    0.3   -1.8    0.7   -0.2    0.3   -0.6    0.6 -2.775558e-17
##             [,742] [,743] [,744] [,745]        [,746] [,747] [,748] [,749]
## [1,]  6.000000e-01    0.8   -0.7   -0.9 -2.775558e-17    1.4    0.2    0.7
## [2,] -5.551115e-17    0.4    0.3   -0.8  3.000000e-01   -1.0   -0.2   -0.6
##      [,750] [,751] [,752]        [,753] [,754] [,755] [,756] [,757] [,758]
## [1,]    0.4    0.4    0.1  5.551115e-17   -0.1    0.1    0.4    0.8   -0.7
## [2,]   -1.6   -0.8   -0.3 -6.000000e-01   -0.1   -1.1    0.3   -1.5   -0.8
##      [,759] [,760] [,761] [,762] [,763] [,764] [,765] [,766] [,767] [,768]
## [1,]   -0.9    0.4    1.1   -0.1    0.2   -0.2   -0.4   -0.2   -0.6   -0.8
## [2,]    0.7   -0.9    0.2   -0.4    0.4    1.0    0.8    0.8    0.9    0.1
##      [,769] [,770] [,771] [,772] [,773] [,774] [,775] [,776] [,777] [,778]
## [1,]   -1.5    1.3   -0.7    0.5    0.3   -0.6   -0.5   -1.1   -1.2   -0.1
## [2,]   -0.2    0.9    0.5    0.6    1.5    0.3    1.4    1.3    1.5    2.8
##      [,779] [,780]
## [1,]   -0.3   -1.3
## [2,]    0.5   -0.4
U <- svdptd$u
U
##            [,1]      [,2]
## [1,] -0.6146784 0.7887779
## [2,]  0.7887779 0.6146784
svdptd$d
## [1] 31.34582 22.25421
D <- diag(svdptd$d)
D
##          [,1]     [,2]
## [1,] 31.34582  0.00000
## [2,]  0.00000 22.25421
V <- svdptd$v
V
##                 [,1]          [,2]
##   [1,] -5.820531e-02  1.017018e-02
##   [2,] -4.026198e-02 -4.419324e-02
##   [3,] -2.743069e-03 -8.276652e-02
##   [4,]  7.583129e-03 -4.294790e-02
##   [5,]  2.379220e-02 -1.376248e-02
##   [6,] -1.476952e-02 -9.027043e-02
##   [7,]  3.278087e-02 -6.656126e-02
##   [8,]  4.772043e-03 -2.324615e-02
##   [9,]  3.444712e-02 -4.764183e-02
##  [10,]  3.470782e-02 -1.887153e-02
##  [11,]  2.630857e-02 -1.100041e-02
##  [12,]  3.326827e-02  4.221348e-02
##  [13,]  2.941437e-02 -5.316599e-02
##  [14,]  2.072041e-02 -2.283104e-02
##  [15,] -1.568766e-02  2.835519e-02
##  [16,]  1.006549e-02  1.104831e-02
##  [17,] -3.160202e-02 -2.329405e-02
##  [18,] -2.575316e-02  1.730688e-02
##  [19,] -1.790933e-02  3.129287e-03
##  [20,] -5.848866e-03 -4.060094e-02
##  [21,]  7.288417e-03 -2.048407e-02
##  [22,] -1.817003e-02 -2.564102e-02
##  [23,] -6.109569e-03 -6.937124e-02
##  [24,]  4.421790e-02 -1.412969e-02
##  [25,] -8.693959e-03  3.033495e-02
##  [26,]  1.790933e-02 -3.129287e-03
##  [27,]  4.216628e-03 -2.955263e-02
##  [28,] -1.088161e-02 -4.612509e-02
##  [29,]  6.323806e-02 -4.646029e-03
##  [30,] -6.143578e-03 -1.813711e-02
##  [31,]  2.221662e-03  2.522591e-02
##  [32,]  3.755291e-02 -8.980741e-02
##  [33,]  4.617886e-02 -1.767409e-02
##  [34,] -1.960958e-03  3.544399e-03
##  [35,]  1.258187e-02  1.381039e-02
##  [36,]  1.705920e-02  1.302806e-02
##  [37,] -3.045719e-02 -6.191523e-02
##  [38,]  1.006549e-02  1.104831e-02
##  [39,] -1.313728e-02 -2.011686e-02
##  [40,] -3.267885e-02 -8.714114e-02
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## [707,]  1.960958e-02 -3.544399e-02
## [708,]  2.630857e-02 -1.100041e-02
## [709,]  3.140934e-02 -1.079445e-01
## [710,]  5.402269e-02 -3.185169e-02
## [711,]  2.434762e-02 -7.456008e-03
## [712,] -4.088541e-02  5.196855e-02
## [713,] -3.607936e-02 -2.251173e-02
## [714,] -1.065492e-02  3.387935e-02
## [715,] -6.186652e-02  4.602929e-02
## [716,] -6.493831e-02  3.696073e-02
## [717,] -7.977585e-02  4.915857e-02
## [718,] -6.212723e-02  1.725898e-02
## [719,] -4.536274e-02  5.275088e-02
## [720,] -1.069005e-01  2.508220e-02
## [721,] -8.229222e-02  4.639650e-02
## [722,] -9.964613e-02  5.583226e-02
## [723,] -9.039676e-02  3.180379e-02
## [724,] -6.578844e-02  5.311809e-02
## [725,] -8.988671e-03  5.279878e-02
## [726,] -5.066755e-03  4.570998e-02
## [727,] -3.248616e-02  4.409743e-02
## [728,] -1.261588e-02  3.742375e-02
## [729,] -3.167004e-02  7.917422e-02
## [730,] -2.575316e-02  1.730688e-02
## [731,] -3.696349e-02  4.487976e-02
## [732,] -9.261842e-02  6.577883e-03
## [733,] -3.862974e-02  2.596033e-02
## [734,] -1.402142e-02  4.727462e-02
## [735,] -3.156802e-02 -7.452819e-02
## [736,]  1.173174e-02  2.996774e-02
## [737,] -3.071789e-03 -9.068554e-03
## [738,]  1.539295e-02 -5.891365e-03
## [739,] -3.332492e-03 -3.783886e-02
## [740,]  9.215367e-03  2.720566e-02
## [741,] -5.882874e-03  1.063320e-02
## [742,] -1.176575e-02  2.126639e-02
## [743,] -5.622171e-03  3.940350e-02
## [744,]  2.127583e-02 -1.652456e-02
## [745,] -2.482365e-03 -5.399621e-02
## [746,]  7.549120e-03  8.286232e-03
## [747,] -5.261715e-02  2.200081e-02
## [748,] -8.954663e-03  1.564644e-03
## [749,] -2.882495e-02  8.238330e-03
## [750,] -4.810581e-02 -3.001564e-02
## [751,] -2.797482e-02 -7.919022e-03
## [752,] -9.510078e-03 -4.741833e-03
## [753,] -1.509824e-02 -1.657246e-02
## [754,] -5.554154e-04 -6.306476e-03
## [755,] -2.964107e-02 -2.683845e-02
## [756,] -2.947118e-04  2.246383e-02
## [757,] -5.343327e-02 -1.307597e-02
## [758,] -6.404281e-03 -4.690741e-02
## [759,]  3.526324e-02 -1.256505e-02
## [760,] -3.049119e-02 -1.068110e-02
## [761,] -1.653779e-02  4.451255e-02
## [762,] -8.104536e-03 -1.459271e-02
## [763,]  6.143578e-03  1.813711e-02
## [764,]  2.908565e-02  2.053197e-02
## [765,]  2.797482e-02  7.919022e-03
## [766,]  2.405290e-02  1.500782e-02
## [767,]  3.441311e-02  3.592301e-03
## [768,]  1.820404e-02 -2.559312e-02
## [769,]  2.438162e-02 -5.869014e-02
## [770,] -2.845094e-03  7.093588e-02
## [771,]  2.630857e-02 -1.100041e-02
## [772,]  5.293450e-03  3.429446e-02
## [773,]  3.186273e-02  5.206436e-02
## [774,]  1.931487e-02 -1.298016e-02
## [775,]  4.503402e-02  2.094709e-02
## [776,]  5.428339e-02 -3.081385e-03
## [777,]  6.127710e-02 -1.101630e-03
## [778,]  7.241942e-02  7.379377e-02
## [779,]  1.846474e-02  3.177189e-03
## [780,]  1.542696e-02 -5.712550e-02

 

Figure 5.5

#Display the two ENSO modes on a world map
library(maps)
library(mapdata)

plot.new()
par(mfrow=c(2,1))

par(mar=c(0,0,0,0)) #Zero space between (a) and (b)
map(database="world2Hires",ylim=c(-70,70), mar = c(0,0,0,0))
grid(nx=12,ny=6)
points(231, -18,pch=16,cex=2, col="red")
text(231, -30, "Tahiti 0.61", col="red")
points(131, -12,pch=16,cex=2.6, col="blue")
text(131, -24, "Darwin -0.79", col="blue")
axis(2, at=seq(-70,70,20),
col.axis="black", tck = -0.05, las=2, line=-0.9,lwd=0)
axis(1, at=seq(0,360,60),
col.axis="black",tck = -0.05, las=1, line=-0.9,lwd=0)
text(180,30, "El Niño Southern Oscillation Mode 1",col="purple",cex=1.3)
text(10,-60,"(a)", cex=1.4)
box()

par(mar=c(0,0,0,0)) #Plot mode 2
map(database="world2Hires",ylim=c(-70,70), mar = c(0,0,0,0))
grid(nx=12,ny=6)
points(231, -18,pch=16,cex=2.6, col="red")
text(231, -30, "Tahiti 0.79", col="red")
points(131, -12,pch=16,cex=2, col="red")
text(131, -24, "Darwin 0.61", col="red")
text(180,30, "El Niño Southern Oscillation Mode 2",col="purple",cex=1.3)
axis(2, at=seq(-70,70,20),
col.axis="black", tck = -0.05, las=2, line=-0.9,lwd=0)
axis(1, at=seq(0,360,60),
col.axis="black",tck = -0.05, las=1, line=-0.9,lwd=0)
text(10,-60,"(b)", cex=1.4)
box()

 

Figure 5.6

#Plot WSOI1
xtime <- seq(1951, 2016-1/12, 1/12)
wsoi1 <- D[1,1]*t(V)[1,]
plot(xtime, wsoi1,type="l",xlab="Year",ylab="Weighted SOI 1",
     col="black",xlim=range(xtime), ylim=range(wsoi1), lwd=1)
axis(3, at=seq(1951,2015,4), labels=seq(1951,2015,4))
grid(nx = NULL, ny = NULL)

#Plot WSOI2
wsoi2 <- D[2,2]*t(V)[2,]
plot(xtime, wsoi2,type="l",xlab="Year",ylab="Weighted SOI 2",
     col="black",xlim=range(xtime), ylim=c(-2,2), lwd=1)
axis(3, at=seq(1951,2015,4), labels=seq(1951,2015,4))
grid(nx = NULL, ny = NULL)

#Plot Cumulative WSOI1
cwsoi1 <- cumsum(wsoi1)
plot(xtime, cwsoi1,type="l",xlab="Year",ylab="Cumulative Weighted SOI 1",
     col="black",xlim=range(xtime), ylim=range(cwsoi1), lwd=1)
axis(3, at=seq(1951,2015,4), labels=seq(1951,2015,4))
grid(nx = NULL, ny = NULL)

#Plot Cumulative WSOI2
cwsoi2 <- cumsum(wsoi2)
plot(xtime, cwsoi2,type="l",xlab="Year",ylab="Cumulative Weighted SOI 2",
     col="black",xlim=range(xtime), ylim=range(cwsoi2), lwd=1)
axis(3, at=seq(1951,2015,4), labels=seq(1951,2015,4))
grid(nx = NULL, ny = NULL)