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74&lt;&lt; prev file | <a href="div.html">next file &gt;&gt;</a>&nbsp;&nbsp;&nbsp;&nbsp;<a href="curl.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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81      <h1 class="directory"><a href="directory-overview.html">Computation/</a></h1>
82      <h2 class="pro_file">curl.pro</h2>
83
84      <div id="file_attr">
85        <dl>
86        </dl>
87      </div>
88
89      <div id="file_comments">
90 Calculate the vertical component of the curl of a field of horizontal vectors
91</div>
92
93     
94
95     
96
97     
98
99     
100
101      <div id="routine_details">
102       
103
104        <div class="routine_details" id="_curl">
105
106          <h2><a class="top" href="#container">top</a>curl <span class="categories">
107 Calculation
108 </span></h2>
109       
110          <p class="header">
111            <span class="result">result = </span>curl(<span class="result"><a href="#_curl_param_uu">uu</a>, <a href="#_curl_param_vv">vv</a></span>, <a href="#_curl_keyword_DIREC">DIREC</a>=<span class="result">scalar string</span>)</p>
112       
113          <div class="comments">
114</div>
115
116          <h3>Return value</h3><div class="preformat"> RES
117 the vertical component of the curl of the input data (with the same size)
118</div>
119
120         
121            <h3>Parameters</h3>
122       
123           
124            <h4 id="_curl_param_uu">uu&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
125             
126             
127             
128             
129             
130             
131             
132             
133            </h4>
134       
135          <div class="comments">
136 Matrix representing the zonal coordinates (U point) of a field of vectors
137 A 2D (xy), 3D (xyz or yt) or a structure readable by litchamp and containing
138 a 2D (xy), 3D (xyz or yt) array (4d case is not coded yet).
139 note that the dimension of the arry must suit the domain dimension.
140</div>
141           
142            <h4 id="_curl_param_vv">vv&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
143             
144             
145             
146             
147             
148             
149             
150             
151            </h4>
152       
153          <div class="comments"> 
154 Matrix representing the meridional coordinates (V point) of a field of vectors
155 A 2D (xy), 3D (xyz or yt) or a structure readable by litchamp and containing
156 a 2D (xy), 3D (xyz or yt) array (4d case is not coded yet).
157 note that the dimension of the arry must suit the domain dimension.
158</div>
159           
160
161         
162
163         
164
165            <h3>Keywords</h3>
166           
167            <h4 id="_curl_keyword_DIREC">DIREC&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
168             
169             
170             
171             
172             
173              <span class="attr">type:</span> <span class="value">scalar string</span>
174             
175             
176            </h4>
177       
178            <div class="comments">
179 Use if you want to call moyenne or grossemoyenne after the div computation
180 with a mean done in the DIREC direction
181</div>
182           
183         
184
185          <h3>Examples</h3><div class="preformat">
186 IDL> @tst_initorca2
187 IDL> plt, curl(dist(jpi,jpj), dist(jpi,jpj))
188</div>
189          <h3>Version history</h3>
190         
191          <h4>Version</h4><div class="preformat">
192 $Id: curl.pro 168 2006-09-06 10:46:29Z pinsard $
193</div>
194          <h4>History</h4><div class="preformat"> 
195 Guillaume Roullet (grlod@ipsl.jussieu.fr)
196 Sebastien Masson (smasson@lodyc.jussieu.fr)
197 adaptation to work with a reduce domain
198 21/5/1999: missing values at !values.f_nan
199 </div>
200         
201         
202          <h3>Known issues</h3>
203         
204         
205          <h4>Todo items</h4><div class="preformat"> 
206 code the 4d case</div>
207          <h4>Restrictions</h4><div class="preformat">
208
209 - Works only for Arakawa C-grid.
210 - UU must be on U grid, VV must be on V grid
211 - 4d case is not coded yet
212 - the common variable jpt is used to differ xyz (jpt=1) and xyt (jpt=1) cases.
213 - U and V arrays are cut in the same geographic domain. Because of the shift between
214   T, U, V and F grids, it is possible that these two arrays do not have the same
215   size and refer to different indexes. In this case, arrays are re-cut on
216   common indexes. To avoid these re-cuts, use the keyword /memeindice in domdef.pro
217 - When computing the divergence, we update, vargrid, varname, varunits and the
218   grid position parameters (firstxf, lastxf, nxf, firstyf, lastyf, nyf).
219 - points that cannot be computed (domain bondaries, coastline) are set to NaN
220</div>
221       
222          <h3>Other attributes</h3>
223         
224         
225          <h4>Uses routines</h4><div class="preformat">
226 cm_4cal, cm_4data, cm_4mmesh
227</div>
228         
229         
230         
231       
232          <h3>Statistics</h3>
233          <table class="statistics">
234            <tr><td>McCabe cyclic</td><td>          55</td></tr>
235            <tr><td>McCabe essential</td><td>           1</td></tr>
236            <tr><td>McCabe modular design</td><td>           1</td></tr>
237          </table>
238         
239       
240        </div>
241       
242      </div>
243
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245
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