Tensor multiplication (Rank 4)

Is there a quick method (or quick and easy method) to transform rank 4 tensors in Matlab?

that is if I have a rank 4 tensor C(mnop) and a 3x3 transformation matrix A:

how do I implement this in matlab:

C'(ijkl) = A(im) A(jn) A(ko) A(lp) C(mnop)

or

C' = A A C AT AT

(where AT is the transpose of A)

kind regards William

[José-Luis]

https://se.mathworks.com/matlabcentral/fileexchange/61754-tensor-matrix-multiply

[William White]

Thanks for that. This is a custom function that seems quite complicated? Does Matlab not handle tensors in a more straightforward way?

[José-Luis]

Nowadays (R2016b +) Matlab allows for explicit expansion of arithmetic operations. This should take it a step closer to what you want.

Unsolicited disclaimer: I don't personally use that because I still find it confusing. I guess I'm getting old.

[William White]

you're not wrong - that does look confusing. I was hoping for a something a little more straightforward (i.e. a one line command like one would use to transform a matrix!)