Erorr in my code
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Hello everyone,
I am using Matlab 2015a. The code I wrote gives an error. How can I fix the error?
this is my code:
newM = birincifaz.*(1:size(birincifaz,1))';
newM(:,1)=[];
for k=1:size(newM,2)
r=unique(newM(:,k));
r=r(r~=0);
B(:,k)=r(randi(length(r),50,1));
end
----------
Error using .*
Matrix dimensions must agree.
Error in sonhal3 (line 2)
newM = birincifaz.*(1:size(birincifaz,1));
回答（1 个）
You're trying to multiply a 2-D matrix by a 1-D column vector that goes from 1 to the number of rows. This will not work in R2015a but will work in later versions where implicit expansion of the column vector to a 2-D matrix will occur. Please upgrade or else use a for loop to do the multiplication
% First way using implicit expansion
birincifaz = randi(9, 3, 5)
newM = birincifaz.*(1:size(birincifaz,1))'
% Alternate way using a for loop
[rows, columns] = size(birincifaz)
newM = zeros(rows, columns);
for col = 1 : columns
for row = 1 : rows
newM(row, col) = birincifaz(row, col) * row;
end
end
newM
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2022-3-18
2022-3-18
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