Re: what is the proper syntax ?

[Jaroslav Hajek]

On Mon, Aug 17, 2009 at 6:29 PM, Christoph
Ellenberger<address@hidden> wrote:
> Sorry to bother with something so trivial but I am not finding the proper 
> syntax anywhere.
>
> I try to extend a vector [1 2 3] into a matrix
> 1 2 3
> 1 2 3
> 1 2 3
> ...
>
> using any possible combination I think it might be (also the ones I am sure 
> they are not)
>
> [1 2 3].* ones(10,1)
> [1 2 3].* ones(10,3)
> [1 2 3].* ones(10,1)'
> [1 2 3].* ones(10,3)'
> [1 2 3]* ones(10,1)
> [1 2 3]* ones(10,3)
> [1 2 3]* ones(10,1)'
> [1 2 3]* ones(10,3)'
> ...
>
> and I always get an error using MinGW 3.2.0. Can someone point me to the 
> proper syntax and confirm that it is or is not a bug ?
>

what you want is
ones (10, 1) * [1 2 3]
or use
repmat ([1 2 3], 10, 1)
which is faster for large vectors. In fact the most efficient way is
[1 2 3] (ones (1, 10), :)
which is close to what repmat does intrinsically.

hth

-- 
RNDr. Jaroslav Hajek
computing expert & GNU Octave developer
Aeronautical Research and Test Institute (VZLU)
Prague, Czech Republic
url: www.highegg.matfyz.cz