Re: [R] Data frame index?

From: Jacques VESLOT <jacques.veslot_at_cirad.fr>
Date: Wed 18 Jan 2006 - 19:09:47 EST

try:

DF2 <- as.data.frame(matrix(vec, nr=nrow(DF),nc=ncol(DF))==

            matrix(1:ncol(DF),nr=nrow(DF),nc=ncol(DF),byrow=T))

DF3 <- data.frame(mapply(function(z,x,y) { x[y] <- 0 ; x },

   names(DF), DF, DF2, SIMPLIFY=F))

but there must be an easier way...

Kenneth Cabrera a écrit :

> Hi, R users:
>
> I have a data.frame (not a matrix), I got a vector with the same
> length as the
> number of records (rows) of the data frame, and each element of
> that vector is the column number (in a specific range of columns) of
> the corresponding
> record that I must set to zero.
>
> How can I do this without a "for" loop?
>
> Thank you for your help.
>
> Kenneth
>
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R-help@stat.math.ethz.ch mailing list
https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html Received on Wed Jan 18 19:20:38 2006

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