Create a vector name from two integer variables
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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
3 个评论
Traian Preda
2013-9-9
Jan
2013-9-9
I do not understand, what you are looking for. Could you provide an explicit example with real data?
Traian Preda
2013-9-9
回答（3 个）
James Tursa
2013-9-9
2 个投票
2 个评论
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
2013-9-9
No, "vector11=[1,5]" from the comment looks, like names are wanted.
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
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
3 个评论
Sean de Wolski
2013-9-9
regexp(sprintf('vector%i%i\nS',fullfact([5 5])'),'S','split')'
:)
Bajdar Nour
2018-8-21
What is mean by something like this name= []?
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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2013-9-9
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