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8  <head>
9    <title>grad.pro (SAXO Documentation)</title>
10
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26  <h1>SAXO Documentation</h1>
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32  <table cellspacing="0">
33    <tr>
34     
35      <td><a href="./../overview.html" title="Overview of library">Overview</a></td>
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39      <td >Directory</td>
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47      <td><a href="./../idldoc-index.html" title="Index of files, routines, and parameters">Index</a></td>
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74<a href="div.html">&lt;&lt;prev file</a> | next file &gt;&gt;&nbsp;&nbsp;&nbsp;&nbsp;<a href="grad.html" target="_TOP">view single page</a> | <a href="./../index.html" target="_TOP">view frames</a>&nbsp;&nbsp;&nbsp;&nbsp;summary: fields | routine&nbsp;&nbsp;&nbsp;&nbsp;details: <a href="#routine_details">routine</a>
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80
81      <h1 class="directory"><a href="directory-overview.html">Computation/</a></h1>
82      <h2 class="pro_file">grad.pro</h2>
83
84      <div id="file_attr">
85        <dl>
86        </dl>
87      </div>
88
89      <div id="file_comments">
90 compute the gradient of a variable
91</div>
92
93     
94
95     
96
97     
98
99     
100
101      <div id="routine_details">
102       
103
104        <div class="routine_details" id="_grad">
105
106          <h2><a class="top" href="#container">top</a>grad <span class="categories">
107 Calculation
108</span></h2>
109       
110          <p class="header">
111            <span class="result">result = </span>grad(<span class="result"><a href="#_grad_param_field">field</a>, <a href="#_grad_param_direc">direc</a></span>)</p>
112       
113          <div class="comments"></div>
114
115          <h3>Return value</h3><div class="preformat"> RES {type=2D, 3D or 4D array}
116 the gradient of the input data (with the same size)
117</div>
118
119         
120            <h3>Parameters</h3>
121       
122           
123            <h4 id="_grad_param_field">field&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
124             
125             
126             
127             
128             
129             
130             
131             
132            </h4>
133       
134          <div class="comments">
135 The field for which we want to compute the gradient.  A 2D (xy),
136 3D (xyz or yt) or 4D (xyzt) array or a structure readable by litchamp
137 and containing a 2D (xy), 3D (xyz or yt) or 4D (xyzt) array.
138 note that the dimension of the arry must suit the domain dimension.
139</div>
140           
141            <h4 id="_grad_param_direc">direc&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
142             
143             
144             
145             
146             
147              <span class="attr">type:</span> <span class="value">scalar string</span>
148             
149             
150            </h4>
151       
152          <div class="comments">
153 the gradient direction: 'x', 'y', 'z'
154</div>
155           
156
157         
158
159         
160
161          <h3>Examples</h3><div class="preformat">
162 IDL> @tst_initorca2
163 IDL> plt, grad({arr:gphit,g:'T'}, 'x')
164 IDL> plt, grad({arr:gphit,g:'T'}, 'y')
165</div>
166          <h3>Version history</h3>
167         
168          <h4>Version</h4><div class="preformat">
169 $Id: grad.pro 168 2006-09-06 10:46:29Z pinsard $
170</div>
171          <h4>History</h4><div class="preformat">
172 Sebastien Masson (smasson@lodyc.jussieu.fr)
173</div>
174         
175         
176          <h3>Known issues</h3>
177         
178         
179         
180          <h4>Restrictions</h4><div class="preformat">
181 - Works only for Arakawa C-grid.
182 - When computing the gradient, the result is not on the same grid point
183   than the input data. In consequence, we update, vargrid and the grid position
184   parameters (firstx[tuvf], lastx[tuvf], nx[tuvf], firsty[tuvf], lasty[tuvf],
185   ny[tuvf], firstz[tw], lastz[tw], nz[tw]).
186 - points that cannot be computed (domain bondaries, coastline) are set to NaN
187 - the common variable jpt is used to differ xyz (jpt=1) and xyt (jpt=1) cases.
188</div>
189       
190          <h3>Other attributes</h3>
191         
192         
193          <h4>Uses routines</h4><div class="preformat">
194 cm_4cal, cm_4data, cm_4mmesh
195</div>
196         
197         
198         
199       
200          <h3>Statistics</h3>
201          <table class="statistics">
202            <tr><td>McCabe cyclic</td><td>          67</td></tr>
203            <tr><td>McCabe essential</td><td>           1</td></tr>
204            <tr><td>McCabe modular design</td><td>           1</td></tr>
205          </table>
206         
207       
208        </div>
209       
210      </div>
211
212     
213
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217
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