r - Max of row in matrix -


i have matrix containing 3 columns in r. matrix this:

a=matrix(c(1,2,3,4,0.5,1,7,1.2,3,4,2,1),nrow=4, ncol=3)

i want create matrix based on a, in each row of returns 1 highest value in row , 0 otherwise. in specific case above, need matrix looks this:

b=matrix(c(0,0,0,1,0,0,1,0,1,1,0,0),nrow=4,ncol=3)

i have tried search forum, couldn't find proper answer.

thanks.

the below pretty same ananda's answer, small changes make difference in terms of speed if sufficiently large

> a<-matrix(rnorm(1000*1000),nrow=1000) > system.time(t(apply(a, 1, function(x) as.numeric(x == max(x)))))    user  system elapsed   0.117   0.024   0.141 > system.time(1*(a==apply(a,1,max)))    user  system elapsed   0.056   0.008   0.065

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