#2970 cmetric() (in ctensor package) does not compute the inverse metric in the non-diagonal case

[César Asensio]

The cmetric() function of the ctensor package does not compute the inverse metric when the metric has non-diagonal components. This can be remedied by explicitly computing the inverse matrix before any calls to scurvature() or ricci(), which seems to indicate that the computation of the inverse metric inside cmetric() is buggy.

The attached file reproduces the error with a minimal two-dimensional non-diagonal metric and exhibits the above mentioned workaround.

wxbug_report() output:

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wxMaxima version: 14.12.1
Maxima version: 5.35.1.2
Maxima build date: 2015-01-15 21:27:01
Host type: i686-pc-mingw32
System type Win32 6.0.6001 (Service Pack 1) X86
Lisp implementation type: SBCL
Lisp implementation version: 1.2.7

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[Viktor Toth]

You are using a version of Maxima in which the matrix inversion code was broken (unrelated to ctensor). Please upgrade to a later version.

[César Asensio]

The problem has gone with Maxima version 5.36.1.
Thank you very much!