assume causes a solving failure
This code
var("a b")
assume(a, "real")
equation=[a+b==0]
s=solve(equation, a, b)
print(s)
causes an AttributeError :
AttributeError: 'list' object has no attribute 'lhs'
The problem comes from the assumption in line 2. Can somebody explain?
I have always a sens of unlegitimity in answering a question, but your problem comes more certainly from the fact that you hve one equation and two unknowns. It works if you use a or b
Cyrille, I think the question is still valid because if we rule out the assumption line, the code yields an answer with a free variable as
solve
has two positional arguments :a (list of) equation(s) to solve, and
a (list of) variable(s) to solve for.
Your call passes a list of one equation, which confuses
solve
. A (very old, AFAICT) bug...Your call also pass three arguments to
solve
: another source of confusion... A second bug ?But I checked that the assumption introduced yet another error. A third bug ??
These bugs seem mutually independent :
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Emmanuel, thanks for your detailed examination.