Port matrix exponential code from scipy

[sritchie]

The "Pade approximation" should knock this off for us: https://github.com/scipy/scipy/blob/v1.5.2/scipy/linalg/matfuncs.py#L210-L255

[littleredcomputer]

(Or we could generate the series :)

…

On Wed, Sep 16, 2020 at 4:37 PM Sam Ritchie ***@***.***> wrote: The "Pade approximation" should knock this off for us: https://github.com/scipy/scipy/blob/v1.5.2/scipy/linalg/matfuncs.py#L210-L255 — You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub <#110>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AAB3Y7IF4J4XTTY6AKE3GFTSGFD4JANCNFSM4RPR5S4Q> .

[sritchie]

Awesome idea @littleredcomputer ! I get it now, after working on #142 :)

[sritchie]

Okay, closing since we now have this in #142.