Bug using an if statement in R script

Hi everyone,

I am experiencing some trouble with an R script in Power BI.

I aim at converting some data of a column depending on its value.

When I run this script, to replaces all "2" by "100", all 2 gets indeed replaced but by "null", not by 100.

Here's the script :

ctr <- 0
for (day in dataset[,1]) {
ctr <- ctr+1
if (dataset[,1][ctr] == 2) {
dataset[,1][ctr] <- 100
}
}

output <- dataset

Here is a screenshot :

Someone may have a clue.

Thanks

Didier