Hello Paul,
A fix is under review for master at
https://codereview.scilab.org/#/c/20965/, I hope it will be reviewed and
merged soon (timings are done on my machine, an old mid-2010 MacPro) :
--> MAT=rand(2.3e6,6);
--> tic;MAT(:,$)=[];toc
ans =
0.051402
--> MAT=rand(2.3e6,6);
--> tic;MAT(:,[1 3])=[];toc
ans =
0.046928
S.
Le 30/04/2019 à 14:04, Carrico, Paul a écrit :
Thanks all
Indeed, getting the complete block works fine and it’s instantaneous
Paul
*De :*users [mailto:users-boun...@lists.scilab.org] *De la part de*
Stéphane Mottelet
*Envoyé :* mardi 30 avril 2019 12:41
*À :* users@lists.scilab.org
*Objet :* [EXTERNAL] Re: [Scilab-users] feedback on removing 1 row and
1 column
Le 30/04/2019 à 08:44, Carrico, Paul a écrit :
Dear All
I’ve been using successfully Scilab for years, to develop my
projects; I do not remember if I’ve ever had to deal with huge
matrixes but that’s the case today.
Using “csvRead”, I got a matrix with 2.3 million of rows and 6
columns (it took about 240 seconds to read it J); nevertheless
I’ve been surprised when I tried to remove the first row and the
last column using basically:
MAT(1,:) = []; MAT(:,$) = [];
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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EA 4297 Transformations Intégrées de la Matière Renouvelable
Département Génie des Procédés Industriels
Sorbonne Universités - Université de Technologie de Compiègne
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