# [R] minimum of each row in a matrix

Tue May 8 15:32:13 CEST 2007

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?apply says that if its second argument is 1, it gives you what you want.

Gabor Csardi has also written you this.

If you have several vectors, not a single matrix, you can use pmin:
pmin(a[1,],a[2,],a[3,],a[4,],a[5,])
However, this variant is inefficient in this particular case (lots of
typing, and hardcoded).

Schmitt, Corinna wrote:
>
> Hallo,
>
> I just followed the discussion of the title: minimum from matrix.
> I have a similar problem.
>
>> a=matrix(c(0,2, 0, 0, 1, 3, 0, 3, 2, 0, 3, 5, 0, 4, 0, 0),ncol=4)
>> a=rbind(a,1:4)
>> a
>      [,1] [,2] [,3] [,4]
> [1,]    0    1    2    0
> [2,]    2    3    0    4
> [3,]    0    0    3    0
> [4,]    0    3    5    0
> [5,]    1    2    3    4
>>
>> minOfColumns=apply(a, 2, function(x) min(x[x!=0]) )
>> minOfColumns
> [1] 1 1 2 4
>> maxOfColumns=apply(a, 2, function(x) max(x) )
>> maxOfColumns
> [1] 2 3 5 4
>>
>
> How looks like the command for the minimum of the rows? I tried several
> possibilities with apply but did not get the wanted result. The result
> should be minOfRows = 0 0 0 0 1
>
>

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