problem with using apply for dataframe

Dear people,

I am including an example of a dataframe:

mydataframe<-data.frame(X=c(1:4),total_bill=c(16.99,10.34,21.01,23.68),tip=c(1.01,1.66,3.50,3.31),sex=c("Male","Male","Male","Female"))

When I use the sapply function getting the information about the factors
works:

sapply(mydataframe,function(x)is.factor(x))

         X total_bill        tip        sex
     FALSE      FALSE      FALSE       TRUE


But if I use the apply function it doesn't work:

apply(mydataframe,2,function(x)is.factor(x))

         X total_bill        tip        sex
     FALSE      FALSE      FALSE      FALSE


I don't understand why, because I have used the apply function for
dataframes before e.g. using sum(x) instead of is.factor(x) and it did work.

Could anyone help me with this?

Thank you very much for your help in advance!

Marion

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