error: Matrix dimensions must agree / Inner matrix dimensions must agree.

1 次查看（过去 30 天）
tevzia
tevzia 2013-9-3
Hi, I tried to multiply two different matrix but program give me an error which is "Inner matrix dimensions must agree". here is my code:
Schedule=[1,4,3,1,1];
nstands=5;
nperiods=4;
adjacency = [0, 1, 1, 0, 1;
1, 0, 0, 1, 0;
1, 0, 0, 0, 0;
0, 1, 0, 0, 0;
1, 0, 0, 0, 0];
adj = tril(adjacency)
n=max(Schedule);
out=zeros(n);
for k=1:n
idx=find(Schedule==k);
out(k,idx)=1;
end
ady = sum((out * adj)') % Error using * Inner matrix dimensions must agree.
totaladdy = sum(ady)
i tried to change it with " .* " but this time it gives : "Matrix dimensions must agree"
This code works when i use on commond window or scipts without other code. whenever i add into the main code it gives an error. I tired to create function and call it in the main code as well. like this
function [ totaladdy ] = calcaddy( schedule, adjacency )
%UNTITLED3 Summary of this function goes here
% Detailed explanation goes here
adj = tril(adjacency);
n=max(schedule);
out=zeros(n);
for k=1:n
idx=find(schedule==k);
out(k,idx)=1;
end
ady = sum((out * adj)');
totaladdy = sum(ady);
end
in the main code i call function like this
[ totaladdy ] = calcaddy( breedingpopulation, adjacency );
Thank you

请先登录，再回答此问题。

回答（1 个）

Walter Roberson
Walter Roberson 2013-9-3
Your adjacency matrix is 5 x 5. tril() of a 5 x 5 is 5 x 5.
Your Schedule has a maximum of 4, so "n" is 4. zeros(n) would be zeros(4) which would be 4 x 4.
You try to do a matrix multiplication of (5 x 5) x (4 x 4) . The second dimension of the first array, 5, does not match the first dimension of the second array, 4, so you cannot matrix multiply the two.
I would suggest
out = zeros(size(adjacency));
but leave n as max(Schedule)

类别

在 Help Center 和 File Exchange 中查找有关 Resizing and Reshaping Matrices 的更多信息

标签

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by