how to multiply every single element in a matrix to entire of another matrix?
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Hello.
I want to multiply every single element in a matrix to entire of another matrix.
x = [100,500,900,1300,1700;
120,600,1080,1560,2040;
140,700,1260,1820,2380;
160,800,1440,2080,2720;
180,900,1620,2340,3060];
z = rand (4,20);
I want to multiply 100 to entire z and then 500 and so on... but when each multipication occured saved it in new indexed parameter.
how can I do this?
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채택된 답변
Paul
2024년 4월 7일
Here's one option to store each result in a cell array that's the same size as x
x = [100,500,900,1300,1700;
120,600,1080,1560,2040;
140,700,1260,1820,2380;
160,800,1440,2080,2720;
180,900,1620,2340,3060];
%z = rand (4,20);
z = [1 2;3 4]; % small z for example
S = cellfun(@(x) x*z,mat2cell(x,ones(1,size(x,1)),ones(1,size(x,2))),'Uni',false)
% check
S{1,1} - x(1,1)*z
S{3,3} - x(3,3)*z
댓글 수: 6
Bruno Luong
2024년 4월 7일
편집: Bruno Luong
2024년 4월 7일
Shorter
x = [100,500,900,1300,1700;
120,600,1080,1560,2040;
140,700,1260,1820,2380;
160,800,1440,2080,2720;
180,900,1620,2340,3060];
%z = rand (4,20);
z = [1 2;3 4]; % small z for example
S = arrayfun(@(xij) xij*z,x,'Uni',false)
추가 답변 (2개)
Steven Lord
2024년 4월 7일
If you're asking can you dynamically create variables with numbered names like x1, x2, x3, etc.? Yes.
Should you do this? The general consensus is no. That Discussions post explains why this is generally discouraged and offers several alternative approaches.
One such approach is to use pages of a 3-dimensional array.
x = [100,500,900,1300,1700;
120,600,1080,1560,2040;
140,700,1260,1820,2380;
160,800,1440,2080,2720;
180,900,1620,2340,3060];
z = rand (4,20);
zv = reshape(z, 1, 1, []);
result = x.*zv;
To check:
isequal(result(:, :, 42), x.*z(42))
Bruno Luong
2024년 4월 7일
편집: Bruno Luong
2024년 4월 7일
x = [100,500,900,1300,1700;
120,600,1080,1560,2040;
140,700,1260,1820,2380;
160,800,1440,2080,2720;
180,900,1620,2340,3060];
%z = rand (4,20);
z = [1 2;3 4]; % small z for example
[mx,nx] = size(x);
[mz,nz] = size(z);
C = mat2cell(kron(x,z),repelem(mz,mx),repelem(nz,nx))
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