Simplify an expression

[Luv Agarwal]

Hey, I was trying to represent the following expression in more compact form:

expr = a*l**2 + 2*a*l + a + b*conjugate(l)**2 - 2*b*conjugate(l) + b

The above expr can be represented as:

expr = a*(l+1)**2 + b*(conjugate(l)-1)**2

Is there any SymPy function to perform such type of conversions? I am aware of combsimp but it is not able to do this conversion.

Thanks

[Aaron Meurer]

collect(expr, [a, b], func=factor) will do what you want.

Also see this discussion
https://groups.google.com/forum/?utm_medium=email&utm_source=footer#!msg/sympy/-0ASBB5JBG0/1XGNURZZCAAJ.

Aaron Meurer

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