Re: [Blitz-support] operator []

[Patrik J. <pa...@uc...>]

Neal Becker wrote:
> Newbie here.  This must be a common issue.
>=20
> This code:
>=20
> int main() {
>   blitz::Array<double,1> x (10);
>=20
>   for (int i =3D 0; i < 10; ++i)
>     x[i] =3D i;
>=20
>   for (int i =3D 0; i < 10; ++i)
>     std::cout << x[i] << '\n';
>=20
>   std::cout << x << '\n';
> }
>=20
> compiles fine, but produces wrong results.
>=20
> Problem is, I needed to use operator() for index, not operator[].
>=20
> Problem is, it compiles and runs without complaint.  Why is that?  Isn'=
t x[1]=20
> invalid?

No, it means something different. Look under "multi-component arrays".
(Essentially, x[1] would pick out the "y-component" of an array of
3-vectors.)

Doesn't turning on BZ_DEBUG give you some kind of error when this happens=
?

cheers,

/Patrik