[cctbxbb] Boost broken on mac?

richard.gildea at diamond.ac.uk richard.gildea at diamond.ac.uk
Thu Apr 7 05:26:17 PDT 2016

Hi Luc,

Making chisq volatile as you suggest changes the floating point exception to a RuntimeError:

$ libtbx.python "/Users/rjgildea/software/cctbx/modules/dials/test/algorithms/statistics/tst_fast_mcd.py"


Traceback (most recent call last):

  File "/Users/rjgildea/software/cctbx/modules/dials/test/algorithms/statistics/tst_fast_mcd.py", line 237, in <module>


  File "/Users/rjgildea/software/cctbx/modules/dials/test/algorithms/statistics/tst_fast_mcd.py", line 146, in test_fast_mcd_small

    fast_mcd = FastMCD([x1, x2, x3])

  File "/Users/rjgildea/software/cctbx/modules/dials/algorithms/statistics/fast_mcd.py", line 165, in __init__

    self._consistency_fac = mcd_consistency(self._p, self._h / self._n)

RuntimeError: Error in function boost::math::gamma_p<e>(e, e): Argument x to the incomplete gamma function must be >= 0 (got x=-7.63324507713441681615e-4653).

The line of dials code that is now failing is (in the same file):

double calpha_inv = cdf(gamma, qalpha/2) / alpha;


After a process of elimination, removing the compiler flag -fno-honor-nans means that the test now passes without error. Do you have any alternative suggestions to try other than removing said flag?



Dr Richard Gildea
Data Analysis Scientist
Tel: +441235 77 8078

Diamond Light Source Ltd.
Diamond House
Harwell Science & Innovation Campus
OX11 0DE
From: cctbxbb-bounces at phenix-online.org [cctbxbb-bounces at phenix-online.org] on behalf of Luc Bourhis [luc_j_bourhis at mac.com]
Sent: 07 April 2016 11:55
To: cctbx mailing list
Subject: Re: [cctbxbb] Boost broken on mac?

On 7 Apr 2016, at 12:46, richard.gildea at diamond.ac.uk<mailto:richard.gildea at diamond.ac.uk> wrote:

Specifically, the line that is causing the problem is line 22, the call to quantile in the return statement:

   // chi^2 distribution with df d.o.f:
   boost::math::chi_squared_distribution<double> chisq(df);

   // Find x s.t. F(x; df) = p where F is the CDF of the Chi^2 dist with df d.o.f
   return quantile(chisq, p);

I don’t have dials set up, unfortunately. Suggestion: make chisq volative…

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