Dear bug-gsl,
I think that I have found a bug in the function gsl_root_test_delta.
When x1 and x0 are both 0.0, gsl_root_test_delta returns -2, indicating
failure to converge.
For instance, the following line of code:
printf("Testing gsl_root_test_delta: %d\n", gsl_root_test_delta(0.,
0., 0., 1e-3));
results in the following output:
Testing gsl_root_test_delta: -2
Best,
Dave Spiegel
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