--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/+time/Rungekutta.m	Thu Sep 20 17:51:19 2018 +0200
@@ -0,0 +1,39 @@
+classdef Rungekutta < time.Timestepper
+    properties
+        F       % RHS of the ODE
+        k       % Time step
+        t       % Time point
+        v       % Solution vector
+        n       % Time level
+        coeffs  % The coefficents used for the RK time integration
+    end
+
+
+    methods
+        % Timesteps v_t = F(v,t), using RK with specfied order from t = t0 with
+        % timestep k and initial conditions v = v0
+        function obj = Rungekutta(F, k, t0, v0, order)
+            default_arg('order','4');
+            obj.F = F;
+            obj.k = k;
+            obj.t = t0;
+            obj.v = v0;
+            obj.n = 0;
+            % Extract the coefficients for the specified order
+            % used for the RK updates from the Butcher tableua.
+            [s,a,b,c] = butcherTableau(order);
+            obj.coeffs = struct('s',s,'a',a,'b',b,'c',c);
+        end
+
+        function [v,t] = getV(obj)
+            v = obj.v;
+            t = obj.t;
+        end
+
+        function obj = step(obj)
+            obj.v = time.rk.rungekutta(obj.v, obj.t, obj.k, obj.F, obj.coeffs);
+            obj.t = obj.t + obj.k;
+            obj.n = obj.n + 1;
+        end
+    end
+end
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