R Replace Values in Data Frame Conditionally (4 Examples) | Exchange Value in Column & Entire Matrix

How to replace values in data frame variables in the R programming language. More details: https://statisticsglobe.com/replace-v...
R code of this video:

data ＜- data.frame(num1 = 1:5, # Example data
num2 = 3:7,
char = letters[1:5],
fac = c("gr1", "gr2", "gr1", "gr3", "gr2"))
data$char ＜- as.character(data$char) # Convert to character

data$num1[data$num1 == 1] ＜- 99 # Replace 1 by 99

data$char[data$char == "b"] ＜- "XXX" # Replace b by XXX

data$fac ＜- as.character(data$fac) # Convert factor to character
data$fac[data$fac == "gr1"] ＜- "new_group" # Replace gr1 by new_group
data$fac ＜- as.factor(data$fac) # Convert character to factor

data[data == 3] ＜- 777 # Replace all values

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