[scilab-Users] fast 2D concatenation

[Serge Steer]

Le 09/03/2012 16:47, David Chèze a écrit :
> Hello,
>
> i'm currently using the cat(1,,) function to concatenate large arrays of
> double of time series and it seems to run quite slow compared to other
> operations available on arrays in scilab.
> Is it a known limitation of this function and do we had better to do custom
> cat function with direct initialization of the array to the max size, then
> overwriting zero initialized part of the array with new read data ?
>
> Thanks for your help,
>
> David
>
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cat is a function that is quite generic. It allows to catenate any kind 
of arrays in any direction. this explain it may be slow. For 2D arrays 
It sould be more efficient to simply use  brackets or initialization 
followed by a sequence of assignments.

Serge Steer
INRIA