[R] How should i get the quantile 2.5 % and 97.5% in each row of a matrix?

[Chuck Cleland]

zhijie zhang wrote:
> Dear friends,
>   I need the get the 2.5% and 97.5% quantile  from each row of a matrix, how
> should i get it?
> BTW, i can get the min/max value from each row of a matrix,  using the
> following programs, is there an easy function to do it?
> 
> simmin<-matrix(NA,nrow=47,ncol=1)
> for (i in 1:47) {
>     simmin[i,]<-min(datas[i,])
>  }
> 
>  Thanks for your help.

mymat <- matrix(rnorm(200), ncol=50)

apply(mymat, 1, quantile, probs = c(0.025,0.975))
           [,1]      [,2]      [,3]      [,4]
2.5%  -1.690786 -1.691700 -1.678078 -1.564438
97.5%  1.970500  1.954904  2.249030  1.862571

apply(mymat, 1, max)
[1] 2.179982 2.257138 2.772428 2.579247

apply(mymat, 1, min)
[1] -2.830661 -1.989114 -1.710050 -2.316970

?apply

-- 
Chuck Cleland, Ph.D.
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