[scilab-Users] problem with creating loop

[Francis Drossaert]

Hi Marcin,

There are off course various ways to solve your problem. Probably the shortest way to do is like this:

for it=1:3;
   average(it) =mean(a(a(:,1)==it,2:$));
end

It loops over the elements in the first column. The second line is a bit more cryptic but can be split in separate line:
msk = a(:,1)==it;                                // creates a boolean mask vector
anew = a(msk,2:$);                          // creates a new matrix using the mask over the second to last columns of a
average=mean(anew);                  // calculate the average of the matrix

Cheers

Francis




From: marcin.wozniczka Gazeta.pl [mailto:marcin.wozniczka at gazeta.pl]
Sent: 12 August 2010 20:59
To: users at lists.scilab.org
Subject: [scilab-Users] problem with creating loop

Hello,
I have small problem with my program/function in Scilab. I want to loop function - the loop must be repeated until all datas will be use. For example I have matrix 'a'
a = [1 10 20
       2 20 30
       3 30 40
       1 20 10
       3 40 40
       2 20 10]
and I'm taking all lines which have in the first column the same number, take average of this and put to the other matrix. I created function which can do all this thing but I don't have any idea how to make a reapeted loop from this.

Can you help me?

--
Marcin Woźniczka

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