[Scilab-users] [EXTERNAL] Re: submatrix issue

[Carrico, Paul]

Evstr(resu(k)) is a paste error - I'm reading an asci file :)

Without using a loop, I would like to get the n th component of the vector resu(k) ... k is no more no less than the index of specific lines I'm trying to get ...

Through your answers I'm understanding that I'm thinking on a bad way

Paul



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De : users [mailto:users-bounces at lists.scilab.org] De la part de antoine monmayrant
Envoyé : vendredi 1 juin 2018 11:55
À : users at lists.scilab.org
Objet : [EXTERNAL] Re: [Scilab-users] submatrix issue


Hello,



What do you wan to achieve exactly?
As Stéphane pointed out, the sizes are not the same.
When you assign something like:

A=B;

You have two different situations:

1) size(A)==size(B)
2) size(B)=[1,1]

In the first case, you assign each element of B to each element of A. In the latter case (which corresponds to your commented line), B is just a scalar that gets assigned to each element of A.

In the current situation, you are neither in case 1) nor in case 2).
As you have size(NodesMatrix2(i,j+1))=[300,300] and size(resu(k))=[300,1], you might want to replicate resu(k) 300 times and fill NodesMatrix2(i,j+1) with these 300 copies. If this what you want to do, here is the code:

NodesMatrix2(i,j+1)=resu(k)*ones(1,300);



By the way, why do you use "evstr(resu(k))" instead of "resu(k)"?



Antoine

Le 01/06/2018 à 11:45, Stéphane Mottelet a écrit :
It cannot work since

--> size(k)
 ans  =

   300.   1.


--> length(i)*length(j)
 ans  =

   90000.

i.e. NodesMatrix2(i,j+1) has 90000 elements and resu(k) has 300

S.

Le 01/06/2018 à 11:07, Carrico, Paul a écrit :


Dear all

I've a submatrix issue on the following example, and I do not remember (or understand) why : how can I do this ?

(the goal is to extract and to store within a matrix results from an Ascii file)

Thanks for any help

Paul

###############################################################

mode(0)

clearall

StartNodeLine= 1;

NumberOfNodes= 100;

DimCoordinates= 3;

resu= rand(1000,1);

tic();

NodesMatrix2= zeros(NumberOfNodes,DimCoordinates+1);

i= [1 : NumberOfNodes]'; NodesMatrix2(i,1) = _evstr_(resu(StartNodeLine + (DimCoordinates+2)*(i-1)+2));

i= [1 : NumberOfNodes]'.*.ones(1,DimCoordinates)';

j= ones(1,NumberOfNodes)'.*.[1 : DimCoordinates]';

k= StartNodeLine + (DimCoordinates+2)*(i-1)+3+j;

a= _evstr_(resu(k));

NodesMatrix2(i,j+1)= _evstr_(resu(k)); /// does not work/

///NodesMatrix2(i,j+1) = 1; // work(basic assignement)/

Duration2= toc()

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