[Scilab-users] vector product (hyper)matrix and vector

[Samuel Gougeon]

Le 28/05/2017 à 03:55, Adelson Oliveira a écrit :
> Thanks,
>
> The trick is to create an auxiliar matrix "A" where replics of array 
> "a" fill the columns and to perform regular elemental multiplications 
> with a reshaped version of the target hypermatrix "H" and then reshape 
> the result as original H. It maybe fast because of vectorization but I 
> still have two questions. This demands addtional memory space if one 
> cannot to do everything in one step,
> and, would it be possible to multiply a line vector "b=(1:5)" to all 
> lines of "H" or another array
> "c" to the third dimension of H in a vectorized way?

Yes: you must first use permute() to put in first position the dimension 
along which you want to multiply the vector, then process as before, and 
finally re-permute() the result in the reverse way.


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