[R] Using a mathematical expression in sapply() XXXX

[R. Michael Weylandt <michael.weylandt@gmail.com>]

On Jan 4, 2012, at 7:41 AM, Dan Abner <dan.abner99 at gmail.com> wrote:

> Hello everyone,
> 
> I have the following call to sapply() and error message. Is the most
> efficient way to deal with this to make sum(!is.na(x)) a function in a
> separate line prior to this call?

Yes or inline using an anonymous/lambda function:

sapply(XX, function(x) sum(!is.na(x)))

> If not, please advise.
> 
> N.Valid=sapply(x,sum(!is.na(x)))
> Error in match.fun(FUN) :
>  'sum(!is.na(x))' is not a function, character or symbol
> 
> 
> Thanks!
> 
> Dan
> 
>    [[alternative HTML version deleted]]
> 
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