Try W.replace() and W.xreplace()
On Friday, 12 June 2015 18:25:00 UTC+1, Rafael Rocha wrote:
>
> Hi everyone.
>
> I am learning sympy and I have a question. I have 3 equations, the third
> is the sum of the two first
>
> I = c1+v1+m1 = w1
> II = c2+v2+m2 = w2
> I + II = C + V + M = W
>
> So, C = c1+c2, V=v1+v2, M=m1+m2 and W=w1+w2
>
> I defined everything in symbols:
>
> c1,v1,m1,w1 = symbols('c1 v1 m1 w1')
> c2,v2,m2,w2 = symbols('c2 v2 m2 w2')
> w1 = c1 + v1 + m1
> print ('w1=',w1)
>
> w2 = c2 + v2 + m2
> print ('w2=',w2)
>
> C,V,M,W = symbols ('C V M W')
>
> C = c1 + c2
> V = v1 + v2
> M = m1 + m2
> W = w1 + w2
>
> After all this, I want to be a able to print W and get C+V+M... But I can
> only get c1+c2+v1+v2+m1+m2
>
> I Am trying to use the subs and sympify function to do this:
>
> A = W.subs({c1+c2:C, v1+v2:V, m1+m2:M, w1+w1:W})
>
> print (sympify(A))
>
>
> But It stills return
>
> c1+c2+v1+v2+m1+m2
>
> How can I make sympy understand I want it to substitute c1+c2 for C and so
> on?
>
> Thanks,
>
> Rafael
>
>
>
>
>
>
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