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Update Runge Kutta for discrete data to return stage rates if needed.
author Martin Almquist <malmquist@stanford.edu>
date Wed, 25 Apr 2018 16:58:45 -0700
parents 8e0067aef5b0
children e76321b89c1e
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line source

function A = spdiag(a,i)
    default_arg('i',0);

    if isrow(a)
        a = a';
    end

    n = length(a)-abs(i);
    A = spdiags(a,i,n,n);
end