Error: Matrix dimensions must agree
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I am trying to execute this piece of code but cannot figure out why I am getting this error, any help is much appriciated.
yp=kron(eye(32),[-1/.5 0;1 0]).*ones(2*32,1)+80*pi.*kron(ones(32),1);[1/.5;0]+2.*90.*diag(ones(2*32-1,1),1).*(kron(ones(32,1),[;1/.5])).*cos(zeros(2*32-1,1)).*(sin(8.*((1/64):(1/64):10)-ones(2*32,1)))./.5
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Seriously? Your code contains some jokes:
- -1/.5 == 2
- kron(eye(32), [-2, 0; 1, 0]) .* ones(64, 1) == kron(eye(32), [-2, 0; 1, 0])
- kron(ones(32), 1) == ones(32)
So a simplified version of the first line is:
yp = kron(eye(32), [-2, 0; 1, 0]) + 80 * pi * ones(32);
% [64 x 64] + [32 x 32]
This cannot work. If you really want to add this, omit the expanding of the 2nd term to a matrix:
yp = kron(eye(32), [-2, 0; 1, 0]) + 80 * pi;
The 2nd part ise useless at all, even if it would work, because the result is not assigned to a variable. So the best solution is simply to delete the 2nd line. By the way, this line contains invalid Matlab syntax:
[1/.5 ; 0] + 2 .* 90 .* diag(ones(63, 1), 1) .* ...
(kron(ones(32, 1), [;1/.5])) .* ...
... % ^ what should this be?!?
cos(zeros(63, 1)) .* sin(8 .* ((1/64):(1/64):10) - ones(64, 1)) ./ .5
% [63 x 1] .* [64 x 640] : cannot match
Expressions like cos(zeros(2*32-1,1)) are a waste of time, because cos(0)==1, so this replace this by ones(63,1).
But as said already: because this part of the code does not perform anything useless, it is easier to delete it than to fix it.
I cannot image a serious task, in which such code could appear.
1 个评论
bl276
2021-4-20
Thanks Jan,
The code comes from a published book. I also could not see how this code could work as is. I did make a typo when eliminating the variables ( [0:1/.5] is what it should read). The code is intened to model pattern formation in the hippocampus.
Here is a snapshot of the code from the book if you are intrigued:
(The part I attempted to shows is at the bottom, this is where I got the matrix error)
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