On Fri, Oct 24, 2008 at 7:08 PM, Waldek Hebisch wrote:
>
> Bill Page wrote:
>> ...
>> It looks to me like just a better version of the 'exquo' that is
>> exported by 'StreamTaylorSeriesOperations' and called by 'exquo'
>> in TaylorSeries (which is already exposed in the interpreter). The
>> commented-out code in 'exprode.spad.pamphlet':
>>
>> --opex := operator("exquo"::Symbol)$OP
>> opex := operator("fixedPointExquo"::Symbol)$OP
>>
>> suggests that perhaps the author of this change just did not want
>> to bother with fixing 'TaylorSeries'.
>>
> I am not sure if 'fixedPointExquo' is better -- it looks that 'exquo'
> performs the same computation, but when given nontrivial zero
> series 'fixedPointExquo' will indefinitly try find nonzero coefficient,
> while 'exquo' will give up after trying 1000 times.
I said "looks" because I like the coding style of this one a little
better than the other one. :-) Perhaps we should also compare
performance? But maybe any difference is really irrelevant in this
application.
I am curious. Can you give a simple example of such a nontrivial zero series?
>
> I have build FriCAS commenting out 'fixedPointExquo' and
> uncommenting the 'exquo' one -- all test pass and this change
> fixes issue 301. So I think that for release we should just use
> 'exquo'.
>
I did similar tests. I agree that we should just use 'exquo'. Perhaps
in fact it was just developed independently or later improved.
Regards,
Bill Page.
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