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copied!<p>Use the <a href="http://www.mathworks.com/help/techdoc/ref/which.html;jsessionid=476BTV2YvlkhJFL5kWRf283QnZmttWVpPcvPgsTTTSZThQXBrGvW!-287992931" rel="nofollow"><code>which</code></a> command to locate the file that is called <code>norm.m</code>. This command should list both the built-in commands and any other m-file (function or scripts) that is on the <a href="http://www.mathworks.com/help/techdoc/matlab_env/br5tea6-6.html" rel="nofollow">MATLAB Search Path</a>.</p> <p>If you found that you have made a <code>norm.m</code> file which you can't rename because it has been used in many places inside your source code, you will need to <code>grep</code> your source code to rename those. Otherwise, there is no guarantee whether your version or MATLAB's version will be called.</p> <hr> <p>The following is quoted directly from MATLAB's <a href="http://www.mathworks.com/help/techdoc/matlab_env/br5tea6-6.html" rel="nofollow">online docs</a>:</p> <blockquote> <p><strong>Detecting and Addressing Name Conflicts</strong><br></p> <p>MATLAB might not be accessing the file that you want it to when:</p> <ul> <li>You use a file and get a warning about a potential name conflict.</li> <li>You get unexpected results.</li> </ul> <p>To identify a name conflict, try using the <code>which</code> function.</p> <p>To address a name conflict, try one of the following:</p> <ul> <li>Change the current folder.</li> <li>Move or remove folders on the search path.</li> <li>Rename or move files.</li> <li>Specify the full path or partial path to the file that you want.</li> <li>Maintain a single version of a file instead of multiple versions.</li> </ul> <p>Name conflicts can arise from using files that you create. Conflicts also can arise from using:</p> <ul> <li>Files that others create, such as from File Exchange</li> <li>A different system that has additional MathWorks products installed</li> <li>A different version of MATLAB, which could include new functions that have the same names as your existing files</li> </ul> </blockquote>

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