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<div class="title">FWRITE File Write Function </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>Writes an array to a given file handle as a block of binary (raw) data. The general use of the function is </p>
<pre class="fragment"> n = fwrite(handle,A)
</pre><p> The <code>handle</code> argument must be a valid value returned by the fopen function, and accessable for writing. The array <code>A</code> is written to the file a column at a time. The form of the output data depends on (and is inferred from) the precision of the array <code>A</code>. If the write fails (because we ran out of disk space, etc.) then an error is returned. The output <code>n</code> indicates the number of elements successfully written.</p>
<p>Note that unlike MATLAB, FreeMat 4 does not default to <code>uint8</code> for writing arrays to files. Alternately, the type of the data to be written to the file can be specified with the syntax </p>
<pre class="fragment"> n = fwrite(handle,A,type)
</pre><p> where <code>type</code> is one of the following legal values: </p>
<ul>
<li>
'uint8','uchar','unsigned char' for an unsigned, 8-bit integer. </li>
<li>
'int8','char','integer*1' for a signed, 8-bit integer. </li>
<li>
'uint16','unsigned short' for an unsigned, 16-bit integer. </li>
<li>
'int16','short','integer*2' for a signed, 16-bit integer. </li>
<li>
'uint32','unsigned int' for an unsigned, 32-bit integer. </li>
<li>
'int32','int','integer*4' for a signed, 32-bit integer. </li>
<li>
'single','float32','float','real*4' for a 32-bit floating point. </li>
<li>
'double','float64','real*8' for a 64-bit floating point. </li>
</ul>
<h1><a class="anchor" id="Example"></a>
Example</h1>
<p>Heres an example of writing an array of <code>512 x 512</code> Gaussian-distributed <code>float</code> random variables, and then writing them to a file called <code>test.dat</code>.</p>
<pre class="fragment">--> A = float(randn(512));
--> fp = fopen('test.dat','w');
--> fwrite(fp,A,'single');
--> fclose(fp);
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