Error, (in gcd/LinZip)

[Christoph Dlapa]

Hi,

lately, I get the following error quite often:

“Error, (in gcd/LinZip) variable in input expression must be in either the evaluate or retained variables”

Please see the three attached files: script, integrand and log

In this example, I rescaled some integrations from [0,1] to [0,infinity) manually. Interestingly, if I let hyperint do the rescaling, everything works fine, so the error somehow has to do with the integrand

Best,

Christoph

[Erik Panzer]

Dear Christoph,

your expression ‘mplinput’ contains ‘x' as a variable, but at the same time also indexed versions ‘x[2]’, ‘x[3]’ etc. It seems that this is causing problems; apparently some Maple routine is thrown off by a polynomial that depends on indexed x’s and at the same time also non-indexed x as supposedly separate variables.

If I change your definition of f4 to

f4:=eval(factor(simplify(mplinput)),[x[2]=x2, x[3]=x3, x[4]=x4, x[5]=x5]):

i.e. replacing the indexed x’s by independent names, the problem disappears. Does this resolve your issue?

Best,

Erik

[Christoph Dlapa]

Dear Erik,

that solves it, thank you!

Best,

Christoph