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diff +time/+rkparameters/rk4.m @ 856:ee4cfb37534d feature/poroelastic

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Merge with feature/d1_staggered to get RK timestepper for discrete data.
author Martin Almquist <malmquist@stanford.edu>
date Tue, 02 Oct 2018 13:39:10 -0700
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--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/+time/+rkparameters/rk4.m	Tue Oct 02 13:39:10 2018 -0700
@@ -0,0 +1,12 @@
+function [a,b,c,s] = rk4()
+
+% Butcher tableau for classical RK$
+s = 4;
+a = sparse(s,s);
+a(2,1) = 1/2;
+a(3,2) = 1/2;
+a(4,3) = 1;
+b = 1/6*[1; 2; 2; 1];
+c = [0; 1/2; 1/2; 1];
+
+end
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