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<div class="title">LOAD Load Variables From A File </div> </div>
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<div class="textblock"><p>Section: <a class="el" href="sec_io.html">Input/Ouput Functions</a> </p>
<h1><a class="anchor" id="Usage"></a>
Usage</h1>
<p>Loads a set of variables from a file in a machine independent format. The <code>load</code> function takes one argument: </p>
<pre class="fragment"> load filename,
</pre><p> or alternately, </p>
<pre class="fragment"> load('filename')
</pre><p> This command is the companion to <code>save</code>. It loads the contents of the file generated by <code>save</code> back into the current context. Global and persistent variables are also loaded and flagged appropriately. By default, FreeMat assumes that files that end in a <code>.mat</code> or <code>.MAT</code> extension are MATLAB-formatted files. Also, FreeMat assumes that files that end in <code>.txt</code> or <code>.TXT</code> are ASCII files. For other filenames, FreeMat first tries to open the file as a FreeMat binary format file (as created by the <code>save</code> function). If the file fails to open as a FreeMat binary file, then FreeMat attempts to read it as an ASCII file.</p>
<p>You can force FreeMat to assume a particular format for the file by using alternate forms of the <code>load</code> command. In particular, </p>
<pre class="fragment"> load -ascii filename
</pre><p> will load the data in file <code>filename</code> as an ASCII file (space delimited numeric text) loaded into a single variable in the current workspace with the name <code>filename</code> (without the extension).</p>
<p>For MATLAB-formatted data files, you can use </p>
<pre class="fragment"> load -mat filename
</pre><p> which forces FreeMat to assume that <code>filename</code> is a MAT-file, regardless of the extension on the filename.</p>
<p>You can also specify which variables to load from a file (not from an ASCII file - only single 2-D variables can be successfully saved and retrieved from ASCII files) using the additional syntaxes of the <code>load</code> command. In particular, you can specify a set of variables to load by name </p>
<pre class="fragment"> load filename Var_1 Var_2 Var_3 ...
</pre><p> where <code>Var_n</code> is the name of a variable to load from the file. Alternately, you can use the regular expression syntax </p>
<pre class="fragment"> load filename -regexp expr_1 expr_2 expr_3 ...
</pre><p> where <code>expr_n</code> is a regular expression (roughly as expected by <code>regexp</code>). Note that a simpler regular expression mechanism is used for this syntax than the full mechanism used by the <code>regexp</code> command.</p>
<p>Finally, you can use <code>load</code> to create a variable containing the contents of the file, instead of automatically inserting the variables into the curent workspace. For this form of <code>load</code> you must use the function syntax, and capture the output: </p>
<pre class="fragment"> V = load('arg1','arg2',...)
</pre><p> which returns a structure <code>V</code> with one field for each variable retrieved from the file. For ASCII files, <code>V</code> is a double precision matrix.</p>
<h1><a class="anchor" id="Example"></a>
Example</h1>
<p>Here is a simple example of <code>save</code>/<code>load</code>. First, we save some variables to a file.</p>
<pre class="fragment">--> D = {1,5,'hello'};
--> s = 'test string';
--> x = randn(512,1);
--> z = zeros(512);
--> who
Variable Name Type Flags Size
D cell [1x3]
s char [1x11]
x double [512x1]
z double [512x512]
--> save loadsave.dat
</pre><p>Next, we clear the variables, and then load them back from the file.</p>
<pre class="fragment">--> clear D s x z
--> who
Variable Name Type Flags Size
ans double [0x0]
--> load loadsave.dat
--> who
Variable Name Type Flags Size
D cell [1x3]
ans double [0x0]
s char [1x11]
x double [512x1]
z double [512x512]
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