Zero Finding 3

library(mosaicCalc)

## Loading required package: mosaic

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## Loading required package: mosaicCore

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## Attaching package: 'mosaicCore'

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## The legacy packages maptools, rgdal, and rgeos, underpinning the sp package,
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## Please refer to R-spatial evolution reports for details, especially
## https://r-spatial.org/r/2023/05/15/evolution4.html.
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## package maintainers should consider adding sf to Suggests:.
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## Attaching package: 'mosaicCalc'

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log(3.1)

## [1] 1.131402

Dari hasil didapat bahwa jika kita memasukkkan nilai x0 sama dengan 3.1 maka akan didapatkan nilai fungsi adalah 1.131402.

Contoh lain adalah jika kita mendapatkan fungsi f(x)=4.5-2.69x+5.9908x^2

ini adalah suatu fungsi polinomial jika kita memberi nilai x0 tertentu pada fungsi tersebut maka kita bisa contohkan hasil dari f(x) adalah 3 maka kita bisa mencarai nilai dari x0 dengan cara seperti berikut:

f <- makeFun(4.5-2.69*x+5.008*x^2 ~ x)

f

## function (x) 
## 4.5 - 2.69 * x + 5.008 * x^2

Zeros(f(x) - 0 ~ x, bounds(x=-25:25))

## # A tibble: 0 × 2
## # ℹ 2 variables: x <lgl>, .output. <dbl>

slice_plot(f(x) ~ x, bounds(x=-7:7)) %>%
  gf_hline(yintercept = ~ 0 , color="blue")