On Nov 30, 8:17 pm, Th <btho...@nexus.hu> wrote:
> Dear All,
>
> I am new to sage (converting from mathcad), so please forgive my basic
> question.
>
> I am trying to solve system of equations in a symbolic way, as a
> simple example:
>
> var('a,b,c,d,d1,d2,d3,x,x1,x2,x3,y,y1,y2,y3')
> symsys=[
> a+b*x1+c*y1==d1,
> a+b*x2+c*y2==d2,
> a+b*x3+c*y3==d3
> ]
> result=solve(symsys,a,b,c)[0]
>
> This is fine, but my problem starts when i start to derive special
> cases. For example how can i simplify the system symbolically, if
> d=d1=d2=d3?
>
> Tried:
> - assume(d1==d2, d1==d3) and solve
> - set d1=d d2=d d3=d and solve
> But the result did not get simplified.
>
> I would always like to start from the general system and apply
> different simplifications for special cases. Can someone please show
> me the proper way to do this?
>
> Thanks in advance:
> Th
sage: solve([eq.substitute(d1=d,d2=d,d3=d) for eq in symsys],[a,b,c])
[[a == d, b == 0, c == 0]]
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