How to use MAT statement multiplication?

[Patrice Terrier]

I would like to perform matrix multiplication using the MAT statement.

The documentation says the syntax to use is:
MAT a1() = a2() * a3() 'Multiplication

however i can't get it to work

TYPE ColorMatrix
    m(0 TO 4, 0 TO 4) AS SINGLE
END TYPE

FUNCTION PBMAIN

DIM cM, cC, cB AS ColorMatrix

MAT cM() = cC() * cB()

END FUNCTION

The compiler says:
Error 437 in test.bas(7:005): AS expected
Line 7: DIM cM, cC, cB AS ColorMatrix

I must say that i do not undertsand what i am doing wrong



Added:
looks like i have to DIM it that way
DIM cM(0 TO 4, 0 TO 4) AS SINGLE, cC(0 TO 4, 0 TO 4) AS SINGLE, cB(0 TO 4, 0 TO 4) AS SINGLE

Would be nice if it could also work directly with a structure type definition.

...

[Eros Olmi]

Not tested but ...

I suspect MAT works on arrays and not on UDT (even if it just contains a single array)

Use a dummyarray dimensioned with DIM ... AT ... at the same location of VARPTR(YourUDT)

Added - OPS: sorry, you already solved the problem.