On 24-10-2013, at 16:15, David Mora <dmv...@gmail.com> wrote:
> I'm writing a function that needs an optional variable. If the variable is
> given, then a subset must be made using that variable, but if the variable
> is not given the subset must be done using all the values for that variable
> (ignoring that variable).
>
> Something like this:
>
> *band <- function(file, fruit = "apple", optional=TRUE) {*
>
> *data <- read.csv(file)*
>
> *a <- nrow(subset(data, 'Column 1' == fruit & 'Column 2'=="hot" & 'Column 3'==
> optional))*
>
> *b <- nrow(subset(data,'Column 1' == fruit & 'Column 2'=="cold" & 'Column 3'==
> optional)) *
>
> *z <- a+b*
>
> * print(z)*
>
> * }*
>
> What I need is that the function *band("file","orange")*, subset the data
> frame using all possible values for Column 3 but is not doing it.
>
> All ideas are welcome.
>
> Thanks.
>
>
> David Mora
>
> [[alternative HTML version deleted]]
>
Please do not post in HTML.
And make stuff bold: in plain text it is converted to things like this:
* }*
which nonsense for R.
Berend
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