#1 wishlist: heaviside, kronecker, etc.

[Anonymous]

Please consider adding some functions used in digital
signal processing, like:

* Heaviside step function
u(x) = 0 if x<0
u(x) = 1 if x>0

* Kronecker delta
delta(x) = 1 if x = 0
delta(x) = 0 otherwise

* rectangular function

* convolution

Thanks.

[Anonymous]

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I've now implemented heaviside step function, kronecker delta,
rectangular function, and some related functions (such as triangular
and ramp functions).

So far it was very easy. Convolution on the hand is a lot more
complicated. Maybe it can help if you specify for which purposes and
functions (or perhaps matrices) you need it.