[EMAIL PROTECTED] wrote:
Hi all
I want to assign a constant to a different column for each row
eg:
m[1,2] <- 0;
m[2,3] <- 0;
m[3,1] <- 0;
m[4,2] <- 0;
m[5,1] <- 0;
...
etc...
i've tried apply/tapply with no luck
and also the following
coefs <- rtt.abs[,5:8];
coefs.i <- coefs[] == 1;
coefs[coefs.i] <- 0;
wich results in
"matrix subscripts not allowed in replacement"
error message, for wich I have not found any workaround
a trivial for() loop is not fast enough
any help would be greatly appreciated, (maybe a gun too) I'm disperated :-\
Thanks in advance
Ulisses
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> cbind(c(1,2,3),c(4,5,6),c(6,7,8))->l
> l
[,1] [,2] [,3]
[1,] 1 4 6
[2,] 2 5 7
[3,] 3 6 8
> l[1:2,1:3]<-4
> l
[,1] [,2] [,3]
[1,] 4 4 4
[2,] 4 4 4
[3,] 3 6 8
>
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