The following code unconditionally removes abs from products and
quotients, but it would be much better if abs could be removed
conditinally depending on what range of values the variables can assume
when the user specifies the ranges of the independent variables!
sym_type = sympy.core.symbol.Symbol
pow_type = sympy.core.power.Pow
abs_type = sympy.abs
mul_type = sympy.core.mul.Mul
def unabs(x):
if type(x) == mul_type:
y = unabs(x.args[0])
for yi in x.args[1:]:
y *= unabs(yi)
return(y)
if type(x) == pow_type:
y = 1/unabs(x.args[0])
return(y)
if len(x.args) == 0:
return(x)
if type(x) == abs_type:
return(x.args[0])
return(x)
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