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annotate +time/Timestepper.m @ 886:8894e9c49e40 feature/timesteppers

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Merge with default for latest changes
author Vidar Stiernström <vidar.stiernstrom@it.uu.se>
date Thu, 15 Nov 2018 16:36:21 -0800
parents b5e5b195da1e 64a9a8a27858
children f5e14e5986b5
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1 classdef Timestepper < handle
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2 properties (Abstract)
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3 t
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4 k
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5 n
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6 % TBD: Decide on accessibility of properties.
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7 % Properties that are not intended to be modified from the outside
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8 % should ideally be made private and the specialized classes should be extended with
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9 % getter functions for their relevant members, e.g v, t, k, etc.
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10 end
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11
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12 methods (Abstract)
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13 % Returns the solution vector v at timestep t.
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14 % TBD: Replace with getters for the separate members if the above suggestion is implemented?
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15 [v,t] = getV(obj)
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16 % Returns struct holding relevant state properties for the specialized timestepper.
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17 % E.g [v, t, k].
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18 state = getState(obj)
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19 obj = step(obj)
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20 end
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22
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23 methods
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24 function [v,t] = stepN(obj,n,progress_bar)
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25 default_arg('progress_bar',false);
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27 if ~progress_bar
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28 obj.stepN_without_progress(n);
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29 else
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30 obj.stepN_with_progress(n);
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31 end
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32
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33 v = obj.getV;
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34 t = obj.t;
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35 end
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36
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37 function stepN_without_progress(obj, n)
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38 for i=1:n
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39 obj.step();
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40 end
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41 end
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42
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43 function stepN_with_progress(obj, n)
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44 FRAME_RATE = 20;
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45
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46 steps_to_update = 1;
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47 steps_since_update = 0;
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48 last_update = tic();
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49 s = util.replace_string('',' %d %%',0);
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50 for i=1:n
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51 obj.step();
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52
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53 steps_since_update = steps_since_update + 1;
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54
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55 if steps_since_update >= steps_to_update
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56 s = util.replace_string(s,' %.2f %%',i/n*100);
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57
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58 time_since_update = toc(last_update);
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59 time_error = time_since_update - 1/FRAME_RATE;
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60 time_per_step = time_since_update/steps_since_update;
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61
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62 steps_to_update = max(steps_to_update - 0.9*time_error/time_per_step ,1);
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63
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64 steps_since_update = 0;
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65 last_update = tic();
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66 end
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67 end
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68
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69 s = util.replace_string(s,'');
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70 end
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71
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73 function [v, t] = stepTo(obj, n, progress_bar)
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74 assertScalar(n);
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75 default_arg('progress_bar',false);
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76
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77 [v, t] = obj.stepN(n-obj.n, progress_bar);
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78 end
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79
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80 function [v,t] = evolve(obj, tend, progress_bar)
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81 default_arg('progress_bar',false)
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82 if ~progress_bar
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83 obj.evolve_without_progress(tend);
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84 else
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85 obj.evolve_with_progress(tend);
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86 end
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87 v = obj.getV;
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88 t = obj.t;
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89 end
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90
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91 function evolve_without_progress(obj, tend)
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92 while obj.t < tend - obj.k/2
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93 obj.step();
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94 end
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95 end
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96
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97 function evolve_with_progress(obj, tend)
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98 FRAME_RATE = 20;
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99
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100 steps_to_update = 1;
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101 steps_since_update = 0;
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102 last_update = tic();
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103 s = util.replace_string('',' %d %%',0);
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104 while obj.t < tend - obj.k/2
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105 obj.step();
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106
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107 steps_since_update = steps_since_update + 1;
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108
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109 if steps_since_update >= steps_to_update
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110 s = util.replace_string(s,' %.2f %%',obj.t/tend*100);
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111
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112 time_since_update = toc(last_update);
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113 time_error = time_since_update - 1/FRAME_RATE;
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114 time_per_step = time_since_update/steps_since_update;
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115
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116 steps_to_update = max(steps_to_update - 0.9*time_error/time_per_step ,1);
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117
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118 steps_since_update = 0;
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119 last_update = tic();
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120 end
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121 end
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122
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123 s = util.replace_string(s,'');
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124 end
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127 end
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128 end