GNU Scientific Library - Bugs: bug #45265, gsl_sf_bessel_J0_e underestimates...
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bug #45265: gsl_sf_bessel_J0_e underestimates error for x>4
Submitter: | Ruslan <l0110111> | ||
Submitted: | Sat 06 Jun 2015 03:19:27 PM UTC | ||
Category: | Accuracy problem | Severity: | 3 - Normal |
Operating System: | Status: | None | |
Assigned to: | None | Open/Closed: | Open |
Release: | 1.16 |
Sat 06 Jun 2015 05:24:18 PM UTC, comment #1: |
Ruslan <l0110111> |
Sat 06 Jun 2015 03:19:27 PM UTC, original submission:
When gsl_sf_bessel_J0_e is supplied x>4, the errors are underestimated in result.err. This becomes especially serious when x>8 and even worse for 17<x<30, where the true_error can be more than 4 times larger than result.err. I suppose for x>30 it's not better. |
Ruslan <l0110111> |
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Corresponding source code
Tested on a 32 bit x86 Linux (LFS) system, gcc-4.5, with default configure options of GSL.