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Integral of expm function

From: Montgomery-Smith, Stephen
Subject: Integral of expm function
Date: Mon, 20 Jul 2020 21:56:28 +0000
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0

In a post on the octave-maintainers mailing list, someone referenced this:

It includes a function that computes

H(t,A) = integral_0^t expm(s*A) ds

Is there an octave function that computes H?  This would be useful for
me.  I did consider using

inv(A) * expm(t*A)

but my matrix A happens to be singular.

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