1 | /* |
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2 | * ---------------------------------------------------------------------- |
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3 | * Rappture::Field1D |
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4 | * This is a continuous, linear function defined by a series of |
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5 | * points for 1-dimensional structures. It's essentially a string |
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6 | * of (x,y) points where the y values can be interpolated at any |
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7 | * point within the range of defined values. |
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8 | * |
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9 | * ====================================================================== |
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10 | * AUTHOR: Michael McLennan, Purdue University |
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11 | * Copyright (c) 2004-2012 HUBzero Foundation, LLC |
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12 | * |
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13 | * See the file "license.terms" for information on usage and |
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14 | * redistribution of this file, and for a DISCLAIMER OF ALL WARRANTIES. |
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15 | * ====================================================================== |
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16 | */ |
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17 | #include <assert.h> |
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18 | #include <math.h> |
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19 | #include "RpField1D.h" |
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20 | |
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21 | using namespace Rappture; |
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22 | |
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23 | Field1D::Field1D() |
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24 | : _vmin(NAN), |
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25 | _vmax(NAN), |
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26 | _meshPtr(NULL), |
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27 | _counter(0) |
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28 | { |
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29 | _meshPtr = Ptr<Mesh1D>(new Mesh1D()); |
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30 | } |
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31 | |
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32 | Field1D::Field1D(const Ptr<Mesh1D>& meshPtr) |
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33 | : _valuelist(), |
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34 | _vmin(NAN), |
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35 | _vmax(NAN), |
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36 | _meshPtr(meshPtr), |
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37 | _counter(0) |
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38 | { |
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39 | } |
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40 | |
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41 | Field1D::Field1D(const Field1D& field) |
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42 | : _valuelist(field._valuelist), |
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43 | _vmin(field._vmin), |
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44 | _vmax(field._vmax), |
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45 | _meshPtr(field._meshPtr), |
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46 | _counter(0) |
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47 | { |
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48 | } |
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49 | |
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50 | Field1D& |
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51 | Field1D::operator=(const Field1D& field) |
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52 | { |
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53 | _valuelist = field._valuelist; |
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54 | _vmin = field._vmin; |
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55 | _vmax = field._vmax; |
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56 | _meshPtr = field._meshPtr; |
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57 | _counter = field._counter; |
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58 | return *this; |
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59 | } |
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60 | |
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61 | Field1D::~Field1D() |
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62 | { |
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63 | } |
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64 | |
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65 | int |
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66 | Field1D::add(double x) |
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67 | { |
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68 | Node1D node = Node1D(x); |
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69 | node.id(_counter++); |
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70 | |
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71 | _valuelist.push_back(0.0); |
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72 | _meshPtr->add(node); |
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73 | |
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74 | return node.id(); |
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75 | } |
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76 | |
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77 | Field1D& |
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78 | Field1D::remove(int nodeId) |
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79 | { |
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80 | _meshPtr->remove(nodeId); |
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81 | return *this; |
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82 | } |
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83 | |
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84 | Field1D& |
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85 | Field1D::clear() |
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86 | { |
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87 | _valuelist.clear(); |
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88 | _meshPtr->clear(); |
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89 | _counter = 0; |
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90 | return *this; |
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91 | } |
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92 | |
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93 | int |
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94 | Field1D::size() const |
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95 | { |
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96 | return _meshPtr->size(); |
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97 | } |
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98 | |
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99 | Node1D& |
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100 | Field1D::atNode(int pos) |
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101 | { |
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102 | return _meshPtr->at(pos); |
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103 | } |
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104 | |
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105 | double |
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106 | Field1D::rangeMin() const |
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107 | { |
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108 | return _meshPtr->rangeMin(); |
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109 | } |
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110 | |
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111 | double |
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112 | Field1D::rangeMax() const |
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113 | { |
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114 | return _meshPtr->rangeMax(); |
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115 | } |
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116 | |
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117 | int |
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118 | Field1D::define(double x, double y) |
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119 | { |
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120 | Node1D node = Node1D(x); |
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121 | Cell1D cell = _meshPtr->locate(node); |
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122 | |
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123 | if (x == cell.x(0) && !cell.isOutside()) { |
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124 | define(cell.nodeId(0), y); |
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125 | } |
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126 | else if (x == cell.x(1) && !cell.isOutside()) { |
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127 | define(cell.nodeId(1), y); |
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128 | } |
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129 | else { |
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130 | int nodeId = _counter++; |
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131 | node.id(nodeId); |
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132 | _valuelist.push_back(0.0); |
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133 | _meshPtr->add(node); |
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134 | define(nodeId, y); |
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135 | } |
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136 | return 0; |
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137 | } |
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138 | |
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139 | int |
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140 | Field1D::define(int nodeId, double y) |
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141 | { |
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142 | _valuelist[nodeId] = y; |
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143 | |
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144 | if (isnan(_vmin) || isnan(_vmax)) { |
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145 | _vmin = _vmax = y; |
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146 | } else { |
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147 | if (y < _vmin) { _vmin = y; } |
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148 | if (y > _vmax) { _vmax = y; } |
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149 | } |
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150 | return 0; |
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151 | } |
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152 | |
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153 | double |
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154 | Field1D::value(double x) const |
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155 | { |
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156 | Node1D node = Node1D(x); |
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157 | Cell1D cell = _meshPtr->locate(node); |
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158 | |
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159 | // if this is a normal cell, then interpolate values |
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160 | if (cell.nodeId(0) >= 0 && cell.nodeId(1) >= 0) { |
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161 | double y0 = _valuelist[cell.nodeId(0)]; |
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162 | double y1 = _valuelist[cell.nodeId(1)]; |
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163 | double xrange = cell.x(1) - cell.x(0); |
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164 | |
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165 | if (xrange == 0.0) { |
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166 | // interval undefined? then return avg y value |
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167 | return 0.5*(y1+y0); |
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168 | } |
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169 | // interpolate |
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170 | double delx = x - cell.x(0); |
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171 | return y0 + (delx/xrange)*(y1-y0); |
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172 | } |
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173 | |
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174 | // extrapolate with constant value for x < xmin |
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175 | else if (cell.nodeId(0) >= 0) { |
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176 | return _valuelist[cell.nodeId(0)]; |
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177 | } |
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178 | |
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179 | // extrapolate with constant value for x > xmax |
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180 | else if (cell.nodeId(1) >= 0) { |
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181 | return _valuelist[cell.nodeId(1)]; |
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182 | } |
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183 | |
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184 | // all else fails, return an empty value |
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185 | return 0.0; |
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186 | } |
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187 | |
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188 | double |
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189 | Field1D::valueMin() const |
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190 | { |
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191 | return _vmin; |
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192 | } |
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193 | |
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194 | double |
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195 | Field1D::valueMax() const |
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196 | { |
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197 | return _vmax; |
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198 | } |
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