On Fri, 2021-09-03 at 02:25 -0700, Pol del Aguila Pla wrote:
> I've encountered a bug in minimize_constrained where it seems that the
> variable name has an effect on the result. My guess is that this happens
> somewhere along the translation from symbolic to numerical function.
> Attached is a minimal notebook to reproduce the bug. Run in the latest
> docker image sagemath/sagemath:latest.
>
minimize_constrained() is using the variables() method on your
function, and variables() sorts said variables alphabetically. So, for
example,
sage: cm1,c0,c1 = SR.var('cm1,c0,c1')
sage: f(cm1,c0,c1) = cm1 + c0 + c1
sage: f.variables()
(c0, c1, cm1)
The minimizer is thus not in the order that you'd expect (i.e. not in
the correct order to be passed to f). I opened
https://trac.sagemath.org/ticket/32511
for this.
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