The following code:
x = [var(f'x{i}') for i in range(3)]
f = sum(x)
f.limit(x[1]=1)gives an error:
SyntaxError: expression cannot contain assignment, perhaps you meant "=="?
If I replace x[1]=1 with x[1]==1, I get
ValueError: call the limit function like this, e.g. limit(expr, x=2).
and we go in circles. How to proceed?
ADDED. This issue has been reported at https://github.com/sagemath/sage/issu...
This is indeed a misdesign of the limit wrapper method/function. Feel free to propose an enhancement.
Workarounds :
sage: X=var("x", n=3)
sage: f=sum(X) ; f
x0 + x1 + x2
sage: f.maxima_methods().limit(X[0], 1)
x1 + x2 + 1
sage: maxima_calculus.limit(f, X[0], 1)._sage_()
x1 + x2 + 1
sage: from sympy import sympify
sage: f._sympy_().limit(*map(sympify, (X[0], 1)))._sage_()
x1 + x2 + 1HTH,
Thanks! Another workaround: f.limit(**{str(x[1]):1})
Anyway, I've submitted the issue: https://github.com/sagemath/sage/issu...
Asked: 0 years ago
Seen: 189 times
Last updated: Oct 03 '24
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