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Create a vector name from two integer variables

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Traian Preda
Traian Preda 2013-9-9
评论： Image Analyst 2018-8-21
Hi,
I want to create a vector name from two integer variables. For example I have two for loops
for i=1:N for j=1:M
and I want to create a vector called vectorij, i.e: vector12, vector 13 and so on. Thanks
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Jan
Jan 2013-9-9
I do not understand, what you are looking for. Could you provide an explicit example with real data?
Traian Preda
Traian Preda 2013-9-9
For example:
I have the A matrix, which changes during 3 iterations like:
Iteration 1 A1=[1 2 3 4; 5 6 7 8];
Iteration 2 A2=[3 5 3 4; 6 6 7 9];
Iteration3 A3=[3 2 3 5; 1 6 4 8];
Then I want to obtain the equivalent vectors associated with the upper 3 matrices
vector11=[1,5]; vector12=[2,6]; .............. vector22=[5,6]; vector23=[3,7]; .............. vector33=[3,4]; vector34=[5,8];
and I want that my vector to have the name: vector_Iteration_No_Column A matrix for example vector34 is vector_Iteration3_Column4
Hope now is much clear :)

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回答（3 个）

James Tursa
James Tursa 2013-9-9
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Azzi Abdelmalek
Azzi Abdelmalek 2013-9-9
编辑：Azzi Abdelmalek 2013-9-9
I think he is not asking for variables name, just a cell array of stings
Jan
Jan 2013-9-9
No, "vector11=[1,5]" from the comment looks, like names are wanted.

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Jan
Jan 2013-9-9
编辑：Jan 2013-9-9
Hiding the indices inside the names of variables is really cruel. Don't do this. You'd never do this in the real life. Names are names, data are data.
A{1} = [1 2 3 4; 5 6 7 8];
A{2} = [3 5 3 4; 6 6 7 9];
A{3} = [3 2 3 5; 1 6 4 8];
Now write instead of "vector11":
A{1}(:, 1)
Or general instead of "vector_ij_":
A{i}(:, j)
This is fast, easy to expand to billions of iterations and fast to process. Using a 3D-array might be even faster, if the elements of A have all the same size.
Azzi Abdelmalek
Azzi Abdelmalek 2013-9-9
编辑：Azzi Abdelmalek 2013-9-9
This is a vector of names
out={};
for k=1:5
for p=1:5
out{end+1}=sprintf('vector%d%d',k,p)
end
end
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Image Analyst
Image Analyst 2018-8-21
It sets the variable called "name" to null, or empty. It still exists, it's just that it has no value at all. Doing that to a row of a matrix will delete that row from the matrix, shortening it.

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