replacement-dataframe.R

# Create a sample data frame
df <- data.frame(
  name1 = c("AAA", "Jane Smith", "AAA", "Sarah Brown"),
  name2 = c("New York City", "AAA", "new york", "AAA"),
  name3 = c("AAA", "Visited NY last year", "AAA", "Never been to NYC"),
  name4 = c("AAA", "90001", "10002", "AAA"),
  stringsAsFactors = FALSE
)
df

##         name1         name2                name3 name4
## 1         AAA New York City                  AAA   AAA
## 2  Jane Smith           AAA Visited NY last year 90001
## 3         AAA      new york                  AAA 10002
## 4 Sarah Brown           AAA    Never been to NYC   AAA

df[] <- replace(df, df == "AAA", "CCCCCC")
df

##         name1         name2                name3  name4
## 1      CCCCCC New York City               CCCCCC CCCCCC
## 2  Jane Smith        CCCCCC Visited NY last year  90001
## 3      CCCCCC      new york               CCCCCC  10002
## 4 Sarah Brown        CCCCCC    Never been to NYC CCCCCC

df[df == "CCCCCC"] <- "XXXXX"
df

##         name1         name2                name3 name4
## 1       XXXXX New York City                XXXXX XXXXX
## 2  Jane Smith         XXXXX Visited NY last year 90001
## 3       XXXXX      new york                XXXXX 10002
## 4 Sarah Brown         XXXXX    Never been to NYC XXXXX