Quoth Luke Palmer on Monday 31 January 2005 03:46 pm,
> C_{ijkl} = A_{ij} * B_{kl}
>
> You write either of:
>
> Â @C[$^i; $^j; $^k; $^l] = @A[$^i; $^j] * @B[$^k; $^l] Â
> @C = Â @A[$^i; $^j] * @B[$^k; $^l] Â
Hmm... This is both insanely great and also greatly insane.
The issue is that, although the tensor notation is powerful, the readability
is becoming lost in all the sigils/funny_characters on the thread variables.
Most of the non-perl-geek scientific-computing people I know already balk at
the '$' and '@' characters because they increase the amount of black noise in
scientific code too much; constructions like that just might send them all
screaming back to FORTRAN. Is there a way to generalize that reduces the
amount of black noise so that the expression shines through?
<< @C[ ^i; ^j; ^k; ^l ] = @A[ ^i; ^j ] * @B[ ^k; ^l ] >>
is much better from a readability standpoint since the j's and k's are
actually visible, but may be horrific from a parsing perspective.
