Re: [Numpy-discussion] double-precision sqrt?

2009-10-17 Thread Dag Sverre Seljebotn
Adam Ginsburg wrote: Hi folks, I'm trying to write a ray-tracing code for which high precision is required. I also need to use square roots. However, math.sqrt and numpy.sqrt seem to only use single-precision floats. Is there a simple way to make sqrt use higher precision? Alternately,

Re: [Numpy-discussion] double-precision sqrt?

2009-10-17 Thread Nadav Horesh
מקורית- מאת: numpy-discussion-boun...@scipy.org בשם Adam Ginsburg נשלח: ש 17-אוקטובר-09 20:08 אל: numpy-discussion@scipy.org נושא: [Numpy-discussion] double-precision sqrt? Hi folks, I'm trying to write a ray-tracing code for which high precision is required. I also need to use square roots

Re: [Numpy-discussion] double-precision sqrt?

2009-10-17 Thread Charles R Harris
On Sat, Oct 17, 2009 at 12:08 PM, Adam Ginsburg adam.ginsb...@colorado.eduwrote: Hi folks, I'm trying to write a ray-tracing code for which high precision is required. I also need to use square roots. However, math.sqrt and numpy.sqrt seem to only use single-precision floats. Is there a

Re: [Numpy-discussion] double-precision sqrt?

2009-10-17 Thread Anne Archibald
2009/10/17 Adam Ginsburg adam.ginsb...@colorado.edu: My code is actually wrong but I still have the problem I've identified that sqrt is leading to precision errors.  Sorry about the earlier mistake. I think you'll find that numpy's sqrt is as good as it gets for double precision. You can

Re: [Numpy-discussion] double-precision sqrt?

2009-10-17 Thread Adam Ginsburg
Hi again, I apologize, the mistake was entirely my own. Sqrt's do the right thing Adam On Sat, Oct 17, 2009 at 12:17 PM, Adam Ginsburg adam.ginsb...@colorado.edu wrote: My code is actually wrong but I still have the problem I've identified that sqrt is leading to precision errors.