One solution -

let's say our data.frame is "xx"
Then:

xx <- matrix(rnorm(9), 3,3)
apply(xx < 0, 1, any)





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On Fri, Aug 6, 2010 at 4:03 PM, Werner W. <pensterfuzzer@yahoo.de> wrote:

> Hi,
>
> I know ways to do this but they all seem awkward and I somehow believe that
> there is a convenient shortcut.
>
> If I have a data.frame with many columns, how can I request all rows for
> which
> at least one column satisfy an expression?
>
> For instance, all rows where at least one column is negative.
>
> Many thanks,
>  Werner
>
>
>
>
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