CODEWITHSUNDEEP
pythonsympysimplification
Pancake_stack_with_syrup
Pancake_stack_with_syrup

Reputation: 33

Sympy having trouble simplifying fractions, which are easily simplified by hand

I have found this annoying problem in sympy. I want to simply the following simple fraction expression below but can't make it work... Sympy even recognizes the two equations as equal making it even more frustrating.

import sympy as sp
a,b,c,d = sp.symbols('a, b, c, d', positive = True)
expr = (a*b*c+2*d*a*c+b*c*d)/(2*a+b)
correct_simpl = c*(d +  a*b/(2*a+b))
display(expr)
display(expr.simplify())
display(correct_simpl)
correct_simpl.equals(expr)

Returns: Output of code:

Upvotes: 2

Views: 80

Answers (1)

smichr
smichr

Reputation: 19125

The following can give you your expression of taste. You can use your interactive prompt to see what each of the steps is doing. The cse is there to collect that 2a+b into a single term that doesn't expand when doing the expansion: r,e=cse(factor_terms(collect(expr,d)));expand(e[0]).subs(r)

enter image description here

Upvotes: 1

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