[Maxima] SF  Full bigfloat precision for Gamma after the second call
macrakis at alum.mit.edu
Mon Oct 13 11:43:29 CDT 2008
On Mon, Oct 13, 2008 at 12:09 PM, Raymond Toy <raymond.toy at ericsson.com>wrote:
> ... It seems to me that the problem is actually in the value of pi. I put
> a break point at *fpsin, and this is what I see, when we change the
> precision from 64 to 128.
Internally, if code wants bfloat pi to the current precision, it should be
calling (fppi), not looking at bigfloat%pi.
I think the problem is that when fpprec is set, fpprec1 is called. But
> this only updates the bfloat versions of 1, 0, +/- 1/2. Perhaps we need
> to update the bigfloat values of %pi at least, and probably also %e and
No! fppi takes care of calculating the value of pi *if needed* and caching
it. If it is not needed, it should not be calculated, as that can be very
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