[R] apply min function rowwise

Joshua Wiley jwiley.psych at gmail.com
Sat Jun 5 18:30:46 CEST 2010

Hello M,

My guess is that it has something to do with the class of the
variables.  Perhaps you could provide a small sample dataframe?  Also
you might try running str() on your data frame and seeing if the
results are what you would expect.  As a side note, it is not
necessary to make an anonymous function here, as you are allowed to
pass arguments to the function applied.

apply(canc[,vec],1, min, na.rm=TRUE)

Best regards,


On Sat, Jun 5, 2010 at 8:30 AM, moleps <moleps2 at gmail.com> wrote:
> I´m trying to tease out the minimum value from a row in a dataframe where all the variables are dates.
> apply(canc[,vec],1,function(x)min(x,na.rm=T))
> However it only returns empty strings for the entire dataframe except for one date value (which is not the minimum date).
> I´ve also tried
> apply(canc[,vec],1,function(x)max(x,na.rm=T))
> which provides values rowwise, but many of them are not in fact the largest in the row.
> Any advice?
> Regards,
> //M
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Joshua Wiley
Senior in Psychology
University of California, Riverside

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