Creating a data frame in R

Question

I have created a dataframe in r called "test". When I try to add a column it throws me an error. Below is the code I am using to create the column:

test$survived[test$sex == "male"] <- 1

Mistake:

Error in $<-.data.frame(*tmp*, "survived", value = numeric(0)) : 
replacement has 0 rows, data has 418

I also tried using ifelse, but it gives me the same error message. I just started using R. Thanks a lot for your help.

0

r

user3202499 Jan 16 14 at 12:34

1 answer

Roland · Accepted Answer · 2014-01-16T12:41:53+0000

I can reproduce this using a dataset iris

like this:

iris$newcol[iris$blub == "blub"] <- 1
#Error in `$<-.data.frame`(`*tmp*`, "newcol", value = numeric(0)) : 
#  replacement has 0 rows, data has 150

There is test

no column sex

. (Note that variable names in R are case sensitive.)