CODEWITHSUNDEEP
r
mlanier
mlanier

Reputation: 197

Error in match.fun(FUN)

I have tried to find an answer to this but I have failed frequently. I have a dataframe with a column of strings. I want to count the number of characters in each entry of the column and replace the string column with the counts.

data[,29]=apply(data[,29],nchar())

Out[2]: Error in match.fun(FUN): argument "FUN" is missing, with no default   
Error in match.fun(FUN): argument "FUN" is missing, with no default

Upvotes: 8

Views: 63773

Answers (2)

Jándrë
Jándrë

Reputation: 89

With data.frames you need to specify the MARGIN parameter of apply, which means, wether you want to apply the funcion to the columns or the rows.

# Apply to rows
apply(data[,29],1,nchar)

## apply(X=data[,29],MARGIN=1,FUN=nchar)

# Apply to columns
apply(data[,29],2,nchar)

Upvotes: 1

Konrad Rudolph
Konrad Rudolph

Reputation: 545528

There are several problems with the code.

First, apply operators on a matrix or data.frame. You probably meant to use sapply instead.

Second, nchar() calls nchar without any argument. You want nchar — i.e. the function name, without calling it (the calling will happen inside sapply):

data[, 29] = sapply(data[,29], nchar)

Upvotes: 11

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