Interpolator coefficients for Radau method in solve_ivp

Travis Czechorski <[email protected]> Wed, 29 Apr 2020 17:10:15 -0400

Newsgroups	gmane.comp.python.scientific.user
Message-ID	<CAKCV6Pfof3NZAiW6oV7+K770xrdw=D7aixUTfqx8OKaT_=pBSw@mail.gmail.com>

Hello,

I am trying to figure out how to calculate the following coefficients in
the source code for the Radau integration method.

# Interpolator coefficients.P = np.array([ [13/3 + 7*S6/3, -23/3 - 22*S6/3,
10/3 + 5 * S6],
  [13/3 - 7*S6/3, -23/3 + 22*S6/3, 10/3 - 5 * S6],
 [1/3, -8/3, 10/3]])

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