Re: [GiNaC-list] Collect() with a list of variables doesn't work in ginsh

21 Mar 2021


      Dear Vitaly,

On 17.03.21 14:57, Vitaly Magerya wrote:
...
Hi, all. In section 5.7.2 of the docs (Expanding and collecting)
there is this example of ginsh usage:
    > a=expand((sin(x)+sin(y))*(1+p+q)*(1+d));
    > collect(a,{p,q});
The docs say I should get this:
    d*sin(x)+(d*sin(x)+sin(y)+d*sin(y)+sin(x))*p
... but actually:
    cannot modify multiply referenced object
This is with GiNaC V1.7.6, V1.7.8, and the latest commit of
V1.8.0.
How do I make this work?
Does the attached patch work for you?

  -richy.
-- 
Richard B. Kreckel
<https://in.terlu.de/~kreckel/>