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annotate +time/CdiffTimeDep.m @ 577:e45c9b56d50d feature/grids

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Add an Empty grid class The need turned up for the flexural code when we may or may not have a grid for the open water and want to plot that solution. In case there is no open water we need an empty grid to plot the empty gridfunction against to avoid errors.
author Jonatan Werpers <jonatan@werpers.com>
date Thu, 07 Sep 2017 09:16:12 +0200
parents 151ab2b5a686
children 8894e9c49e40
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1 classdef CdiffTimeDep < time.Timestepper
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2 properties
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3 D
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4 E
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7 t
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8 v
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9 v_prev
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10 n
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11 end
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14 methods
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15 % Solves u_tt = Du + E(t)u_t + S(t)
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16 % D, E, S can either all be constants or all be function handles,
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17 % They can also be omitted by setting them equal to the empty matrix.
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18 % CdiffTimeDep(D, E, S, k, t0, n0, v, v_prev)
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19 function obj = CdiffTimeDep(D, E, S, k, t0, n0, v, v_prev)
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20 m = length(v);
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21 default_arg('E', @(t)sparse(m,m));
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22 default_arg('S', @(t)sparse(m,1));
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24 obj.D = D;
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25 obj.E = E;
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26 obj.S = S;
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28 obj.k = k;
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29 obj.t = t0;
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30 obj.n = n0;
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31 obj.v = v;
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32 obj.v_prev = v_prev;
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33 end
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35 function [v,t] = getV(obj)
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36 v = obj.v;
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37 t = obj.t;
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38 end
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40 function [vt,t] = getVt(obj)
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41 vt = (obj.v-obj.v_prev)/obj.k; % Could be improved using u_tt = f(u))
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42 t = obj.t;
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43 end
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45 function obj = step(obj)
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46 [obj.v, obj.v_prev] = time.cdiff.cdiff(obj.v, obj.v_prev, obj.k, obj.D, obj.E(obj.t), obj.S(obj.t));
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47 obj.t = obj.t + obj.k;
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48 obj.n = obj.n + 1;
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49 end
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