Hi everyone,
I am having trouble combining mpmath's findroot function with sympy.
Here is a short example of what I am trying to accomplish:
import sympy
import mpmath
mpmath.mp.dps = 45
x = sympy.var('x')
p = (5.0/2.0*x**3 - 3.0/2.0*x).as_poly()
print 'subs: ', mpmath.findroot(lambda xi: p.s
If I try this with mpmath 0.16 (the version we currently have in sympy in the
latest git master), I get:
In [22]: print 'subs: ', mpmath.findroot(lambda xi: p.subs(x, xi), 1.0)
subs:
---
ValueError
Thanks for the quick reply Aaron. I will get the latest git version
and run with it. BTW, I was running the sample on 0.6.7.
Thanks again,
Matt
On Thu, May 26, 2011 at 08:28:51PM -0600, Aaron S. Meurer wrote:
> If I try this with mpmath 0.16 (the version we currently have in sympy in the
> lat
Well, it still fails there with the subs. Like I said, it's a bug. Can you
open an issue for it?
Aaron Meurer
On May 26, 2011, at 9:09 PM, Matthew Emmett wrote:
> Thanks for the quick reply Aaron. I will get the latest git version
> and run with it. BTW, I was running the sample on 0.6.7.
>
Hi,
On 27 May 2011 06:31, Aaron S. Meurer wrote:
> Well, it still fails there with the subs. Like I said, it's a bug. Can
> you open an issue for it?
>
It's not necessarily a bug, because you expect subs() (sympy) and findroot()
(mpmath) to work together, but you are skipping the glue (core/e
Indeed if you do this:
mpmath.findroot(lambda xi: p.subs(x, Expr._from_mpmath(xi,
mpmath.mp.prec)), 1.0)
[That is, you manually construct sympy objects which reflect the
precision required by mpmath.]
On 27.05.2011 05:57, Mateusz Paprocki wrote:
Hi,
On 27 May 2011 06:31, Aaron S. Meurer m
I should have finished my sentence ... the way I show works.
On 27.05.2011 09:28, Tom Bachmann wrote:
Indeed if you do this:
mpmath.findroot(lambda xi: p.subs(x, Expr._from_mpmath(xi,
mpmath.mp.prec)), 1.0)
[That is, you manually construct sympy objects which reflect the
precision required by
I opened an issue for this.
As noted by Mateusz, Tom and Vinzent, there are ways around this.
However, from an end users perspective, it would be nice if it worked
as I had originally tried.
Thanks again for the quick reply,
Matt
On Thu, May 26, 2011 at 10:31:02PM -0600, Aaron S. Meurer wrote:
