[R] apply lm() to each row of a matrix

[Bert Gunter]

Reread ?lm and note that the lhs can be a matrix. I believe this is
exactly what you want.

-- Bert

On Sun, Jan 29, 2012 at 2:05 PM, Martin Batholdy
<batholdy at googlemail.com> wrote:
> Hi,
>
>
> I would like to fit lm-models to a matrix with 'samples' of a dependent variable (each row represents one sample of the dependent variable).
> The independent variable is a vector that stays the same:
>
>
> y <- c(1:10)
> x <- matrix(rnorm(5*10,0,1), 5, 10)
>
>
>
> now I would like to avoid looping over the rows, since my original matrix is much larger;
>
>
>
> for(t in 1:dim(x)[1]) {
>
>        print(lm(y ~ x[t,]))
>
> }
>
>
> Is there a time-efficient way to do this?
>
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-- 

Bert Gunter
Genentech Nonclinical Biostatistics

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