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Blitz Support : |
From: Frank Schimmel (frs_at_[hidden])
Date: 2004-04-15 02:58:02
>>>>> Julian Cummings writes:
> Hi Lee,
> I played around a bit with the example code you submitted. The main
> thing you are doing wrong with repsect to the blitz part of your test is
> that you are using square bracket indexing notation instead of using the
> standard blitz indexing notation with parentheses. Thus,
> // Variable Array test using Blitz++: Array<int,2>
> int test_six(int M, int N, Array<int,2> thisarray)
^^^
Shouldn't this be a reference?
> {
> // NOTE: Switching iteration order or subscript order for C++ optimization
> for (int i=0; i < M; i++)
> {
> for (int j=0; j < N; j++)
> {
> thisarray(i,j)=(i*N)+j;
> }
> }
> }
If I understand this correctly, the call to test_six() copy constructs
a new blitz array on the stack (which still represents the same data,
though). That's done 10000 times! (As opposed to just passing a
pointer in the other cases.)
What would a reference change?
Regards
-Frank Schimmel