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annotate +time/Rungekutta4.m @ 983:b89379fb0814 feature/timesteppers

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Convert Rungekutta4 to take F(t,y) instead of a matrix
author Jonatan Werpers <jonatan@werpers.com>
date Tue, 08 Jan 2019 12:07:57 +0100
parents f5e14e5986b5
children 0585a2ee7ee7
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1 classdef Rungekutta4 < time.Timestepper
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2 properties
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3 F
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4 dt
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5 t
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6 v
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7 n
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8 end
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11 methods
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12 % Create a time stepper for
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13 % v_t = F(t,v), v(t0) = v0
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14 % with step size dt.
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15 function obj = Rungekutta4(F, dt, t0, v0)
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16 obj.F = F;
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17 obj.dt = dt;
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18 obj.t = t0;
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19 obj.v = v0;
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20 obj.n = 0;
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21 end
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22
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23 function [v,t] = getV(obj)
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24 v = obj.v;
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25 t = obj.t;
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26 end
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28 function obj = step(obj)
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29 obj.v = time.rk.rungekutta_4(obj.v, obj.t, obj.dt, obj.F);
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30 obj.t = obj.t + obj.dt;
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31 obj.n = obj.n + 1;
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32 end
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33 end
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35 methods (Static)
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36 function dt = getTimeStep(lambda)
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37 dt = rk4.get_rk4_time_step(lambda);
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38 end
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39 end
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40 end