what is wrong?
3 views (last 30 days)
Show older comments
why it show error
??? Error using ==> cat CAT arguments dimensions are not consistent.
Error in ==> @(i)cat(3,randperm(m)',[11*ones(N(1,i),1);22*ones(N(2,i),1);33*ones(N(3,i),1);44*ones(N(4,i),1)])
m=22;
AA = [m 7];
N=[11,9,11,10,10,9,9;7,7,7,7,7,7,7;4,5,4,4,4,5,5;1,1,1,1,1,1,1];
B = cell2mat(arrayfun(@(i)cat(3,randperm(m)',[11*ones(N(1,i),1);22*ones(N(2,i),1);33*ones(N(3,i),1);44*ones(N(4,i),1)]),1:size(N,2),'un',0));
x = B(sub2ind(szAA,B(:,:,1),cumsum(ones(AA),2))+prod(AA));
i cant understand what the problem,can someone help me?
1 Comment
Accepted Answer
Andrei Bobrov
on 12 May 2011
Hi Sahab! More variant solving your problem
m=22;
AA = [m 7];
N=[11,9,11,10,10,9,9;7,7,7,7,7,7,7;4,5,4,4,4,5,5;1,1,1,1,1,1,1];
t=sum(N)~=AA(1);
if any(t), I1 = randi(size(N,1)-1); N(I1,:) = N(I1,:)-t; end
x = zeros(AA);
xx = 11*(1:4)';
for j = 1:size(N,2)
x(randperm(AA(1)),j) = ...
cell2mat(arrayfun(@(i)xx(i)*ones(N(i,j),1),1:length(xx),'un',0).');
end
More Answers (2)
Matt Fig
on 11 May 2011
The problem is that in your first N, all of the values sum to m:
m=22;
N=[8,11,18,7,9,8,13;6,2,1,5,3,6,1;4,3,2,5,5,4,6;4,6,1,5,5,4,2];
all(sum(N)==m)
and the second does not.
N=[11,9,11,10,10,9,9;7,7,7,7,7,7,7;4,5,4,4,4,5,5;1,1,1,1,1,1,1];
all(sum(N)==m)
In order to get away from the CAT error, you need all(sum(N)==m) to return true.
Andy
on 11 May 2011
When you cat along the third dimension, the first two dimensions must match up. Let's look at what your cat-ing. First, you have randperm(m)', a column vector of size [m 1], where m is always 22. Then you have
[11*ones(N(1,i),1);22*ones(N(2,i),1);33*ones(N(3,i),1);44*ones(N(4,i),1)]
For, say, i=1, this has size [N(1,1)+N(2,1)+N(3,1)+N(4,1), 1]. This is a column vector of length 23 (and the length will be different depending on i). So the dimensions don't match up correctly.
What are you really trying to do with this code?
2 Comments
Andy
on 11 May 2011
Matt Fig responded correctly in his answer below, except I think he intended:
all(sum(N) == m)
rather than
all(sum(N)) == m
It is either an accident that one of your values of N satisfies this constraint (which MUST be satisfied for the cat to work), or the N which does not work was incorrectly calculated somehow. Again, could you describe what your code is supposed to accomplish? How is N calculated? What are B and x ultimately supposed to hold? Can you give a small example of some input and the desired output?
See Also
Categories
Find more on Matrix Indexing in Help Center and File Exchange
Products
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!