passing and declaring vectors and matrices?

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

re: passing and declaring vectors and matrices?

sandwich_eater@hotmail.com wrote:[color=blue]
> 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?[/color]

What is 'y' here? What is 'u'? How can your question be answered
without knowing what the 'mufunc1' and 'myfunc2' do?

V

re: passing and declaring vectors and matrices?

Sorry I meant 'A' not u. I only wrote these functions as examples. My
question is a general one about how to declare and pass vectors upto a
maximum dimension, or open size if that can be done.

Victor Bazarov wrote:[color=blue]
> sandwich_eater@hotmail.com wrote:[color=green]
> > 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?[/color]
>
> What is 'y' here? What is 'u'? How can your question be answered
> without knowing what the 'mufunc1' and 'myfunc2' do?
>
> V[/color]

re: passing and declaring vectors and matrices?

sandwich_eater@hotmail.com wrote:[color=blue]
> 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) ?[/color]

Try std::vector<float> and std::vector<std::vector<float> >.
Then use pass by reference for passing them to functions.

[SNIP][color=blue]
> if A is changed in both myfuncs will A1 and A2 change?[/color]

Depends on what you mean by change but generally yes.