Creating a dataframe in R

Question

I created a data frame in r called "test". When I am trying to add a column it throws me an error. Below is the code i use to create a column:

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

Error I get:

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 have just started using R. Would greatly appreciate your help.

Roland · Accepted Answer · 2014-01-16 12:41:53Z

2

I can reproduce this with the iris dataset 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 no column sex in test. (Keep in mind that variable names in R are case-sensitive.)

answered Jan 16, 2014 at 12:41

Roland

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1 Comment

Hi Roland, Thank you for your quick response. I got this and also fixed it. Will be more aware regarding this going forward....:)