Opened 3 years ago

#21873 new defect

(Maxima's) solve is unable to solve a linear system with complicated coefficients

Reported by: charpent Owned by:
Priority: major Milestone: sage-7.5
Component: symbolics Keywords: maxima solve
Cc: Merged in:
Authors: Reviewers:
Report Upstream: Reported upstream. No feedback yet. Work issues:
Branch: Commit:
Dependencies: Stopgaps:

Description

Long story : see this sage-support thread.

Short story : Let M_x be the matrix representing a rotation of angle theta about the x axis (in R^3), and M_y the matrix representing a rotation of angle phi about the y axis. Trying to find by elementary methods the axis of the composition, i. e. solving M_y*M_x*V-V for V, the only solution found its the trivial null vector.

This has been reproduced in Maxima and reported on their bug system as bugs:3239, with no answer at the time of the present filing.

This can be worked around by using Sympy's solve, which involves some conversions using _sage_() (not that well documented).

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