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view +time/+expint/Magnus_mp.m @ 510:71908bbce2e1 feature/quantumTriangles

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tried to add 4th order magnus integrator which does not work
author Ylva Rydin <ylva.rydin@telia.com>
date Fri, 02 Jun 2017 17:46:01 +0200
parents 566304a5733e
children 4ef2d2a493f1
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% Takes one time step of size k using the magnus midpoinr
% starting from v_0 and where the function F(v,t) gives the
% time derivatives.
function v = Magnus_mp(v,D, t , k)

if isa(D,'function_handle')
   % v = krylov(k*D(t +k/2*t),v);
   v = expm(k*D(t +k/2))*v;
else
   %v = krylov(k*D,v);
   v = expm(k*D)*v;
end

end