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Extract value from AND object specified by reduce_rational_inequality parameters ([[- 3 <2 * x + 1]], x). example.And (-2 <x, x <oo)

I want to extract a value from the result that I get with reduce_rational_inequalities([[-3 < 2*x + 1]], x)

. For example my answer after running the specified function

AND (-2 <x, x <oo)

... Now I want

-2

from this exit. I also do the operation with a different equation. reduce_rational_inequalities([[2*x + 1 < 5]], x)

... And the answer I get is

And (-oo <x, x <2)

... Now I want

2

out of this exit. and want to combine these two outputs.

If anyone has gone through this simplex library with a specific operation. Please let me know.

Thanks for any help in advance.

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2 answers


Someone can give a better answer. But this approach really works.

>>> reduce_rational_inequalities([[-3 < 2*x + 1]], x)
And(-2 < x, x < oo)
>>> result = reduce_rational_inequalities([[-3 < 2*x + 1]], x)
>>> result.args
(-2 < x, x < oo)
>>> result.args[0]
-2 < x
>>> result.args[1]
x < oo
>>> result.args[0].args[0]
-2
>>> result.args[0].args[0].is_number
True


Even when the result can be expressed as a tuple of one-sided intervals, as is the case here, the included constants can still appear on either side of the inequality. However, you can use the method is_number

to determine which side contains the number.

Let him hope someone has a better way.

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If you set x

as target, the part x < oo

will be removed:



>>> from sympy.solvers.inequalities import reduce_rational_inequalities
>>> x = symbols('x', finite=True)
>>> reduce_rational_inequalities([[-3 < 2*x + 1]], x)
-2 < x
+1


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