[Numpy-discussion] New ufuncs

Charles R Harris charlesr.harris@gmail....
Thu Nov 6 15:48:49 CST 2008


On Thu, Nov 6, 2008 at 1:23 PM, T J <tjhnson@gmail.com> wrote:

> On Wed, Nov 5, 2008 at 2:09 PM, Charles R Harris
> <charlesr.harris@gmail.com> wrote:
> > I'm inclined to go with logaddexp and add logsumexp as an alias for
> > logaddexp.reduce. But I'll wait until tomorrow to see if there are more
> > comments.
>
> When working in other bases, it seems like it would be good to avoid
> having to convert to base e and then back to base 2 with each function
> call (for example).  Is there any desire add similar functions for
> other standard bases?
>

I suppose that depends on who you ask ;) What is your particular interest in
these other bases and why would they be better than working in base e and
converting at the end? The only one I could see really having a fast
implementation is log2. In fact, I think the standard log starts in log2 by
pulling in the floating point exponent and then using some sort of rational
approximation of log2 over the range [1,2) on the mantissa.

Chuck
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