odefun x < x0

[Toan T Nguyen]

Dear all,

I need to solve 1st order ODEs from x0 to  x<x0. I read the document of latest official mpmath 1.1.0

that the backward step is not supported in odefun module.

Is this still the case for the development version in GitHub?

Best regards,

Toan

[Kris Kuhlman]

Can you perform a change of variables (x -> -x) on your problem to solve it using forward integration?

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[Toan T Nguyen]

On Friday, April 17, 2020 at 3:03:39 AM UTC+7, Kris Kuhlman wrote:

Can you perform a change of variables (x -> -x) on your problem to solve it using forward integration?

Thanks. That's what I'm doing now.

It's inside a large external code written for backward integration using GSL. I'm moving to mpmath to increase the significant digits,

so I have to scanning through the whole code to make this change. It's a bit scary.

Best regards

Toan

 

On Thu, Apr 16, 2020 at 11:26 Toan T Nguyen <nguyen...@gmail.com> wrote:

Dear all,

I need to solve 1st order ODEs from x0 to  x<x0. I read the document of latest official mpmath 1.1.0

that the backward step is not supported in odefun module.

Is this still the case for the development version in GitHub?

Best regards,

Toan

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