MATLAB: How to multiply each row of a matrix with every row of another matrix elementwise

elementwisematrixmultiplicationtensor

I have two matrices A and B with size k x m and l x m, respectively. I want to multiply each row of matrix A with each row of matrix B elementwise to get a tensor of size k x l x m.

Best Answer

bsxfun(@times,permute(A,[1,3,2]),permute(B,[3,1,2]))

or using MATAB R2016b and newer:

permute(A,[1,3,2]) .* permute(B,[3,1,2])

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reshape(A,512,[],243)

MATLAB: Is there a way to vpasolve elementwise

The contour plot is actually the solution. Solving a two-variable problem like that is one of its hidden benefits.

I’m not quite sure what you want to do, but I solved for ‘c’ here, and then had contour provide the (x,y) coordinates for that over the grid you gave it. Here, I asked it for the coordinates corresponding to c=0:

x = 1:5;
y = 1:5;
[X,Y] = meshgrid(x,y);
F = (3-X)./Y;
sol = contour(X, Y, F, [0 0]);
xy = sol(:,2:end)

The ‘xy’ matrix are the coordinates, x = xy(1,:) and y = xy(2,:). I refer you to the documentation on contour for the details. Substitute other values for the fourth argument to define other values of ‘c’.

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MATLAB: Is there a way to vpasolve elementwise

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