Le 01/06/2018 à 12:46, Carrico, Paul a écrit :
Evstr(resu(k)) is a paste error - I’m reading an asci file J
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
I think you can achieve what you want to do without a for loop.
But my feeling is that there is something wrong with the way you index
your matrix NodesMatrix2(i,j+1) and your results resu(k).
When you index with "i" and "j+1" that are vectors of length N & M, you
are basically indexing NxM elements of you matrix.
This seems to be the core of the issue here.
Maybe indexing your matrix like a vector (ie NodesMatrix2(p) with p in
[1:length(NodesMatrix2)]) would be better.
Antoine
Paul
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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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