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Message: [QUOTE="sandwich_eater, post: 2512407"] What is the usual way to declare real (float) vectors and matrices? What ways are there to pass them to them into a function (by ref, by val, pointer) ? this is what I have... const int MAX_MAT_DIM = 200; typedef double TMTMatrix [MAX_MAT_DIM][MAX_MAT_DIM]; typedef double TMTVector [MAX_MAT_DIM]; void myfunc1(TMTVector &y, TMTMatrix &A); void myfunc2(TMTVector *y, TMTMatrix *A); .... TMTMatrix A1, A2; myfunc1(y, A1); myfunc2(&y, &A2); if u is changed in both myfuncs will A1 and A2 change? Thanks, Daniel [/QUOTE]