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74<a href="grad.html">&lt;&lt;prev file</a> | next file &gt;&gt;&nbsp;&nbsp;&nbsp;&nbsp;<a href="norm.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>
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90 calculate the norm of vectors field located on Arakawa C-grid
91</div>
92
93     
94
95     
96
97     
98
99     
100
101      <div id="routine_details">
102       
103
104        <div class="routine_details" id="_norm">
105
106          <h2><a class="top" href="#container">top</a>norm <span class="categories">
107 Calculation
108</span></h2>
109       
110          <p class="header">
111            <span class="result">result = </span>norm(<span class="result"><a href="#_norm_param_uu">uu</a>, <a href="#_norm_param_vv">vv</a></span>, <a href="#_norm_keyword_DIREC">DIREC</a>=<span class="result">DIREC</span>, <a href="#_norm_keyword__EXTRA">_EXTRA</a>=<span class="result">_EXTRA</span>)</p>
112       
113          <div class="comments">
114</div>
115
116          <h3>Return value</h3><div class="preformat">
117 A 2D (xy), 3D (xyz or yt), 4D (xyzt) Array
118</div>
119
120         
121            <h3>Parameters</h3>
122       
123           
124            <h4 id="_norm_param_uu">uu&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
125              <span class="attr">in</span>
126             
127             
128              <span class="attr">required</span>
129             
130             
131             
132             
133            </h4>
134       
135          <div class="comments">
136 Matrix representing the zonal coordinates (at U/V point) of a field of vectors
137 A 2D (xy), 3D (xyz or yt), 4D (xyzt) or a structure readable by
138 <a href="..//ToBeReviewed/LECTURE/litchamp.html">litchamp</a> and containing a 2D (xy), 3D (xyz or yt), 4D (xyzt) array.
139 Note that the dimension of the array must suit the domain dimension.
140</div>
141           
142            <h4 id="_norm_param_vv">vv&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
143              <span class="attr">in</span>
144             
145             
146              <span class="attr">required</span>
147             
148             
149             
150             
151            </h4>
152       
153          <div class="comments">
154 Matrix representing the meridional coordinates (at V/U point) of a field of vectors
155 A 2D (xy), 3D (xyz or yt), 4D (xyzt) or a structure readable by
156 <a href="..//ToBeReviewed/LECTURE/litchamp.html">litchamp</a> and containing a 2D (xy), 3D (xyz or yt), 4D (xyzt) array.
157 Note that the dimension of the array must suit the domain dimension.
158</div>
159           
160
161         
162
163         
164
165            <h3>Keywords</h3>
166           
167            <h4 id="_norm_keyword_DIREC">DIREC&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
168             
169             
170             
171             
172             
173             
174             
175             
176            </h4>
177       
178            <div class="comments">
179 't' 'x' 'y' 'z' 'xys' 'xz' 'yz' 'xyz' 'xt' 'yt' 'zt' 'xyt'
180       'xzt' 'yzt' 'xyzt' Direction on which do averages
181</div>
182           
183            <h4 id="_norm_keyword__EXTRA">_EXTRA&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
184             
185             
186             
187             
188             
189             
190             
191             
192            </h4>
193       
194            <div class="comments">
195 Used to declare that this routine accepts inherited keywords
196</div>
197           
198         
199
200          <h3>Examples</h3><div class="preformat">
201 To calculate the average of the norm of streams on all the domain
202 between 0 and 50:
203      IDL> domdef, 0, 50
204      IDL> res = norm(un, vn, dir = 'xyz')
205</div>
206          <h3>Version history</h3>
207         
208          <h4>Version</h4><div class="preformat">
209 $Id: norm.pro 327 2007-12-13 16:22:35Z pinsard $
210</div>
211          <h4>History</h4><div class="preformat">
212 Sebastien Masson (smasson@lodyc.jussieu.fr)
213                       9/6/1999</div>
214         
215         
216          <h3>Known issues</h3>
217         
218         
219         
220          <h4>Restrictions</h4><div class="preformat">
221 The norm is calculated on points T. To do this calculation, we average
222 field U and V on points T before calculate the norm. At the edge of
223 coast and of domain, we can not calculate fields U and V at points T,
224 that is why these points are at value !values.f_nan.
225
226 When we calculate on a reduce geographic domain, field U and V have not
227 necessarily the same number of point. In this case, we recut U and V to
228 keep only common points. We profit of this to redo a <a href="..//ToBeReviewed/GRILLE/domdef.html">domdef</a> which redefine
229 a geographic domain on which fields U and V are extracted on same points
230
231 To know what type of array we work with, we  test its size and dates
232 gave by time[0] and time[jpt-1] to know if thee is a temporal dimension.
233 Before to start norm, make sure that time and jpt are defined how
234 they have to!
235</div>
236       
237          <h3>Other attributes</h3>
238         
239         
240          <h4>Uses routines</h4><div class="preformat">
241 cm_4mesh
242 cm_4data
243 cm_4cal
244</div>
245         
246         
247         
248       
249          <h3>Statistics</h3>
250          <table class="statistics">
251            <tr><td>McCabe cyclic</td><td>         121</td></tr>
252            <tr><td>McCabe essential</td><td>           1</td></tr>
253            <tr><td>McCabe modular design</td><td>           1</td></tr>
254          </table>
255         
256       
257        </div>
258       
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260
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262
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