[Scilab-users] [EXTERNAL] Re: feedback on removing 1 row and 1 column

[Carrico, Paul]

Thanks all

Indeed, getting the complete block works fine and it's instantaneous

Paul

De : users [mailto:users-bounces at lists.scilab.org] De la part de Stéphane Mottelet
Envoyé : mardi 30 avril 2019 12:41
À : users at lists.scilab.org
Objet : [EXTERNAL] Re: [Scilab-users] feedback on removing 1 row and 1 column

Le 30/04/2019 à 08:44, Carrico, Paul a écrit :
Dear All

I've been using successfully Scilab for years, to develop my projects; I do not remember if I've ever had to deal with huge matrixes but that's the case today.

Using "csvRead", I got a matrix with 2.3 million of rows and 6 columns (it took about 240 seconds to read it :)); nevertheless I've been surprised when I tried to remove the first row and the last column using basically:
MAT(1,:) = []; MAT(:,$) = [];

in the meantime (before we fix this), you can do

MAT = MAT(:,1:$-1);

which will be way faster !

S.

Indeed I needed to kill the process after about 10 minutes (same result both under Windows 10 and Linux - RAM not fully used).

By comparison, the same process is instantaneous under Python using Numpy (numpy.delete) using of course the same matrix.

A feedback I wanted to share ....

PaulEXPORT CONTROL :
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Stéphane Mottelet

Ingénieur de recherche

EA 4297 Transformations Intégrées de la Matière Renouvelable

Département Génie des Procédés Industriels

Sorbonne Universités - Université de Technologie de Compiègne

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