Erorr in my code

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Esra Demirbilek
Esra Demirbilek 2022 年 3 月 18 日
コメント済み: Esra Demirbilek 2022 年 3 月 18 日
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 件)

Image Analyst
Image Analyst 2022 年 3 月 18 日
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)
birincifaz = 3×5
8 1 1 2 3 8 8 9 3 5 1 1 9 1 3
newM = birincifaz.*(1:size(birincifaz,1))'
newM = 3×5
8 1 1 2 3 16 16 18 6 10 3 3 27 3 9
% Alternate way using a for loop
[rows, columns] = size(birincifaz)
rows = 3
columns = 5
newM = zeros(rows, columns);
for col = 1 : columns
for row = 1 : rows
newM(row, col) = birincifaz(row, col) * row;
end
end
newM
newM = 3×5
8 1 1 2 3 16 16 18 6 10 3 3 27 3 9
  1 件のコメント
Esra Demirbilek
Esra Demirbilek 2022 年 3 月 18 日
thank you so much

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