bugGNU 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: 

Tested on a 32 bit x86 Linux (LFS) system, gcc-4.5, with default configure options of GSL.

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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