[R] Question

[Ambrosini Alessandro]

Hello. I want to use "for".
I have a matrix called "mat" that has got 100 rows.
I want to take the line 1 and make

a1<-which(mat[1,]==1)

After this I want to take the second row and make

a2<-which(mat[2,]==1)

and so on until I arrive at row 100.

I want to make it automatic for the 100 rows and so I wrote:

for(i in 1:nrow(mat)){
       ai<-which(mat[i,]==1) 
 }

but it doesn't work.
I need to obtain 100 vectors called a1,a2,a3,...,a100. 
Please help me.
Alessandro
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