How can I multiply N dimensional matrices

I am trying to multiply a 3x3xn matrix with a 3x4xn matrix.

I tried a for loop but it says that the matrix dimensions do not agree.

The new matrix that I need is just the product of the first A(:,:,i)*B(:,:,i) which should work but in my case it isn't

Answer 1

[KSSV]

C = zeros(3,4,n) ; 
for i = 1:n
    C(:,:,i) = A(:,:,i)*B(:,:,i) ; 
end

Answer 2

[James Tursa]

Other options from the FEX:

https://www.mathworks.com/matlabcentral/fileexchange/8773-multiple-matrix-multiplications-with-array-expansion-enabled

https://www.mathworks.com/matlabcentral/fileexchange/37515-mmx

https://www.mathworks.com/matlabcentral/fileexchange/25977-mtimesx-fast-matrix-multiply-with-multi-dimensional-support

The first one is m-code, and the last two are mex routines that require a C compiler.

Answer 3

[Steven Lord]

See the pagemtimes function introduced in release R2020b.

[James Tursa]

Finally! Guess I can now stop worrying about updating MTIMESX.