ASKSAGE: Sage Q&A Forum - RSS feedhttps://ask.sagemath.org/questions/Q&A Forum for SageenCopyright Sage, 2010. Some rights reserved under creative commons license.Sat, 05 Sep 2020 11:14:41 +0200I'm searching to perform this multivariate limit (correctly)https://ask.sagemath.org/question/53309/im-searching-to-perform-this-multivariate-limit-correctly/ I'm searching to perform this kind of limit (without restricting and executing the limit to a variable):
$$
\lim_{(x, y)\to(0, 0)}\frac{x^3y}{x^6+y^2}
$$
In the documentation I didn't find a multivariate limit function..Teo7Sat, 05 Sep 2020 11:14:41 +0200https://ask.sagemath.org/question/53309/Sage returning wrong derivativehttps://ask.sagemath.org/question/50704/sage-returning-wrong-derivative/I am trying to calculate the derivative of `y = e^(x*y)`
Hand calculation give me the result of `dy/dx = ( y*e^(x*y) ) / ( 1 - x*e^(x*y) )`
But the sage is giving me the wrong output of `-y/x`. Here is my code:
sage:
sage: y=function('y')(x)
sage: y
y(x)
sage:
sage: expr = exp(1)**(x*y)
sage:
sage: diff(y)
diff(y(x), x)
sage:
sage: diff(expr)
(x*diff(y(x), x) + y(x))*e^(x*y(x))
sage:
sage: solve(diff(expr), diff(y))
[diff(y(x), x) == -y(x)/x]
sage:
sage:
ggSun, 12 Apr 2020 19:25:28 +0200https://ask.sagemath.org/question/50704/