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<a name="System-Information"></a>
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<p>
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</div>
<hr>
<a name="System-Information-1"></a>
<h3 class="section">36.11 System Information</h3>
<a name="XREFcomputer"></a><dl>
<dt><a name="index-computer"></a>Function File: <em></em> <strong>computer</strong> <em>()</em></dt>
<dt><a name="index-computer-1"></a>Function File: <em><var>c</var> =</em> <strong>computer</strong> <em>()</em></dt>
<dt><a name="index-computer-2"></a>Function File: <em>[<var>c</var>, <var>maxsize</var>] =</em> <strong>computer</strong> <em>()</em></dt>
<dt><a name="index-computer-3"></a>Function File: <em>[<var>c</var>, <var>maxsize</var>, <var>endian</var>] =</em> <strong>computer</strong> <em>()</em></dt>
<dt><a name="index-computer-4"></a>Function File: <em><var>arch</var> =</em> <strong>computer</strong> <em>("arch")</em></dt>
<dd><p>Print or return a string of the form <var>cpu</var>-<var>vendor</var>-<var>os</var> that
identifies the type of computer that Octave is running on.
</p>
<p>If invoked with an output argument, the value is returned instead of
printed. For example:
</p>
<div class="example">
<pre class="example">computer ()
-| i586-pc-linux-gnu
mycomp = computer ()
⇒ mycomp = "i586-pc-linux-gnu"
</pre></div>
<p>If two output arguments are requested, also return the maximum number of
elements for an array. This will depend on whether Octave has been
compiled with 32-bit or 64-bit index vectors.
</p>
<p>If three output arguments are requested, also return the byte order of the
current system as a character (<code>"B"</code> for big-endian or <code>"L"</code>
for little-endian).
</p>
<p>If the argument <code>"arch"</code> is specified, return a string indicating the
architecture of the computer on which Octave is running.
</p>
<p><strong>See also:</strong> <a href="#XREFisunix">isunix</a>, <a href="#XREFismac">ismac</a>, <a href="#XREFispc">ispc</a>.
</p></dd></dl>
<a name="XREFuname"></a><dl>
<dt><a name="index-uname"></a>Built-in Function: <em>[<var>uts</var>, <var>err</var>, <var>msg</var>] =</em> <strong>uname</strong> <em>()</em></dt>
<dd><p>Return system information in the structure.
</p>
<p>For example:
</p>
<div class="example">
<pre class="example">uname ()
⇒ {
sysname = x86_64
nodename = segfault
release = 2.6.15-1-amd64-k8-smp
version = Linux
machine = #2 SMP Thu Feb 23 04:57:49 UTC 2006
}
</pre></div>
<p>If successful, <var>err</var> is 0 and <var>msg</var> is an empty string.
Otherwise, <var>err</var> is nonzero and <var>msg</var> contains a
system-dependent error message.
</p></dd></dl>
<a name="XREFnproc"></a><dl>
<dt><a name="index-nproc"></a>Built-in Function: <em></em> <strong>nproc</strong> <em>()</em></dt>
<dt><a name="index-nproc-1"></a>Built-in Function: <em></em> <strong>nproc</strong> <em>(<var>query</var>)</em></dt>
<dd><p>Return the current number of available processors.
</p>
<p>If called with the optional argument <var>query</var>, modify how processors
are counted as follows:
</p>
<dl compact="compact">
<dt><code>all</code></dt>
<dd><p>total number of processors.
</p>
</dd>
<dt><code>current</code></dt>
<dd><p>processors available to the current process.
</p>
</dd>
<dt><code>overridable</code></dt>
<dd><p>same as <code>current</code>, but overridable through the <code><span class="nolinebreak">OMP_NUM_THREADS</span></code><!-- /@w -->
environment variable.
</p></dd>
</dl>
</dd></dl>
<a name="XREFispc"></a><dl>
<dt><a name="index-ispc"></a>Function File: <em></em> <strong>ispc</strong> <em>()</em></dt>
<dd><p>Return true if Octave is running on a Windows system and false otherwise.
</p>
<p><strong>See also:</strong> <a href="#XREFisunix">isunix</a>, <a href="#XREFismac">ismac</a>.
</p></dd></dl>
<a name="XREFisunix"></a><dl>
<dt><a name="index-isunix"></a>Function File: <em></em> <strong>isunix</strong> <em>()</em></dt>
<dd><p>Return true if Octave is running on a Unix-like system and false otherwise.
</p>
<p><strong>See also:</strong> <a href="#XREFismac">ismac</a>, <a href="#XREFispc">ispc</a>.
</p></dd></dl>
<a name="XREFismac"></a><dl>
<dt><a name="index-ismac"></a>Function File: <em></em> <strong>ismac</strong> <em>()</em></dt>
<dd><p>Return true if Octave is running on a Mac OS X system and false otherwise.
</p>
<p><strong>See also:</strong> <a href="#XREFisunix">isunix</a>, <a href="#XREFispc">ispc</a>.
</p></dd></dl>
<a name="XREFisieee"></a><dl>
<dt><a name="index-isieee"></a>Built-in Function: <em></em> <strong>isieee</strong> <em>()</em></dt>
<dd><p>Return true if your computer <em>claims</em> to conform to the IEEE standard
for floating point calculations.
</p>
<p>No actual tests are performed.
</p></dd></dl>
<a name="XREFisdeployed"></a><dl>
<dt><a name="index-isdeployed"></a>Function File: <em></em> <strong>isdeployed</strong> <em>()</em></dt>
<dd><p>Return true if the current program has been compiled and is running
separately from the Octave interpreter and false if it is running in
the Octave interpreter.
</p>
<p>Currently, this function always returns false in Octave.
</p></dd></dl>
<a name="XREFisstudent"></a><dl>
<dt><a name="index-isstudent"></a>Built-in Function: <em></em> <strong>isstudent</strong> <em>()</em></dt>
<dd><p>Return true if running in the student edition of <small>MATLAB</small>.
</p>
<p><code>isstudent</code> always returns false in Octave.
</p>
<p><strong>See also:</strong> <a href="Logical-Values.html#XREFfalse">false</a>.
</p></dd></dl>
<a name="XREFOCTAVE_005fHOME"></a><dl>
<dt><a name="index-OCTAVE_005fHOME"></a>Built-in Function: <em></em> <strong>OCTAVE_HOME</strong> <em>()</em></dt>
<dd><p>Return the name of the top-level Octave installation directory.
</p>
<p><strong>See also:</strong> <a href="Controlling-Subprocesses.html#XREFEXEC_005fPATH">EXEC_PATH</a>, <a href="Loading-and-Saving-Images.html#XREFIMAGE_005fPATH">IMAGE_PATH</a>.
</p></dd></dl>
<a name="XREFmatlabroot"></a><dl>
<dt><a name="index-matlabroot"></a>Function File: <em></em> <strong>matlabroot</strong> <em>()</em></dt>
<dd><p>Return the name of the top-level Octave installation directory.
</p>
<p>This is an alias for the function <code><span class="nolinebreak">OCTAVE_HOME</span></code><!-- /@w --> provided for
compatibility.
</p>
<p><strong>See also:</strong> <a href="#XREFOCTAVE_005fHOME">OCTAVE_HOME</a>.
</p></dd></dl>
<a name="XREFOCTAVE_005fVERSION"></a><dl>
<dt><a name="index-OCTAVE_005fVERSION"></a>Built-in Function: <em></em> <strong>OCTAVE_VERSION</strong> <em>()</em></dt>
<dd><p>Return the version number of Octave as a string.
</p>
<p><strong>See also:</strong> <a href="#XREFver">ver</a>, <a href="#XREFversion">version</a>.
</p></dd></dl>
<a name="XREFversion"></a><dl>
<dt><a name="index-version"></a>Function File: <em></em> <strong>version</strong> <em>()</em></dt>
<dd><p>Return the version number of Octave as a string.
</p>
<p>This is an alias for the function <code><span class="nolinebreak">OCTAVE_VERSION</span></code><!-- /@w --> provided for
compatibility.
</p>
<p><strong>See also:</strong> <a href="#XREFOCTAVE_005fVERSION">OCTAVE_VERSION</a>, <a href="#XREFver">ver</a>.
</p></dd></dl>
<a name="XREFver"></a><dl>
<dt><a name="index-ver"></a>Function File: <em></em> <strong>ver</strong></dt>
<dt><a name="index-ver-1"></a>Function File: <em></em> <strong>ver</strong> <em>Octave</em></dt>
<dt><a name="index-ver-2"></a>Function File: <em></em> <strong>ver</strong> <em><var>package</var></em></dt>
<dt><a name="index-ver-3"></a>Function File: <em>v =</em> <strong>ver</strong> <em>(…)</em></dt>
<dd>
<p>Display a header containing the current Octave version number, license
string, and operating system. The header is followed by a list of installed
packages, versions, and installation directories.
</p>
<p>Use the package name <var>package</var> or Octave to limit the listing to a
desired component.
</p>
<p>When called with an output argument, return a vector of structures
describing Octave and each installed package. The structure includes the
following fields.
</p>
<dl compact="compact">
<dt><code>Name</code></dt>
<dd><p>Package name.
</p>
</dd>
<dt><code>Version</code></dt>
<dd><p>Version of the package.
</p>
</dd>
<dt><code>Revision</code></dt>
<dd><p>Revision of the package.
</p>
</dd>
<dt><code>Date</code></dt>
<dd><p>Date of the version/revision.
</p></dd>
</dl>
<p><strong>See also:</strong> <a href="#XREFversion">version</a>, <a href="#XREFoctave_005fconfig_005finfo">octave_config_info</a>, <a href="Java-Interface-Functions.html#XREFusejava">usejava</a>, <a href="Installing-and-Removing-Packages.html#XREFpkg">pkg</a>.
</p></dd></dl>
<a name="XREFcompare_005fversions"></a><dl>
<dt><a name="index-compare_005fversions"></a>Function File: <em></em> <strong>compare_versions</strong> <em>(<var>v1</var>, <var>v2</var>, <var>operator</var>)</em></dt>
<dd><p>Compare two version strings using the given <var>operator</var>.
</p>
<p>This function assumes that versions <var>v1</var> and <var>v2</var> are arbitrarily
long strings made of numeric and period characters possibly followed by an
arbitrary string (e.g., <code>"1.2.3"</code>, <code>"0.3"</code>, <code>"0.1.2+"</code>,
or <code>"1.2.3.4-test1"</code>).
</p>
<p>The version is first split into numeric and character portions and then
the parts are padded to be the same length (i.e., <code>"1.1"</code> would be
padded to be <code>"1.1.0"</code> when being compared with <code>"1.1.1"</code>, and
separately, the character parts of the strings are padded with nulls).
</p>
<p>The operator can be any logical operator from the set
</p>
<ul>
<li> <code>"=="</code>
equal
</li><li> <code>"<"</code>
less than
</li><li> <code>"<="</code>
less than or equal to
</li><li> <code>">"</code>
greater than
</li><li> <code>">="</code>
greater than or equal to
</li><li> <code>"!="</code>
not equal
</li><li> <code>"~="</code>
not equal
</li></ul>
<p>Note that version <code>"1.1-test2"</code> will compare as greater than
<code>"1.1-test10"</code>. Also, since the numeric part is compared first,
<code>"a"</code> compares less than <code>"1a"</code> because the second string
starts with a numeric part even though <code>double ("a")</code> is greater than
<code>double ("1").</code>
</p></dd></dl>
<a name="XREFlicense"></a><dl>
<dt><a name="index-license"></a>Command: <em></em> <strong>license</strong></dt>
<dt><a name="index-license-1"></a>Command: <em></em> <strong>license</strong> <em>inuse</em></dt>
<dt><a name="index-license-2"></a>Command: <em></em> <strong>license</strong> <em>inuse <var>feature</var></em></dt>
<dt><a name="index-license-3"></a>Function File: <em></em> <strong>license</strong> <em>("inuse")</em></dt>
<dt><a name="index-license-4"></a>Function File: <em><var>retval</var> =</em> <strong>license</strong> <em>("inuse")</em></dt>
<dt><a name="index-license-5"></a>Function File: <em><var>retval</var> =</em> <strong>license</strong> <em>("test", <var>feature</var>)</em></dt>
<dt><a name="index-license-6"></a>Function File: <em><var>retval</var> =</em> <strong>license</strong> <em>("checkout", <var>feature</var>)</em></dt>
<dt><a name="index-license-7"></a>Function File: <em>[<var>retval</var>, <var>errmsg</var>] =</em> <strong>license</strong> <em>("checkout", <var>feature</var>)</em></dt>
<dd><p>Get license information for Octave and Octave packages.
</p>
<p>GNU Octave is free software distributed under the GNU General Public
License (GPL), and a license manager makes no sense. This function is
provided only for <small>MATLAB</small> compatibility.
</p>
<p>When called with no extra input arguments, it returns the Octave license,
otherwise the first input defines the operation mode and must be one of
the following strings: <code>inuse</code>, <code>test</code>, and <code>checkout</code>.
The optional <var>feature</var> argument can either be <code>"octave"</code> (core),
or an Octave package.
</p>
<dl compact="compact">
<dt><code>"inuse"</code></dt>
<dd><p>Returns a list of loaded features, i.e., octave and the list of loaded
packages. If an output is requested, it returns a struct array with
the fields <code>"feature"</code>, and <code>"user"</code>.
</p>
</dd>
<dt><code>"test"</code></dt>
<dd><p>Return true if the specified <var>feature</var> is installed, false otherwise.
</p>
<p>An optional third argument <code>"enable"</code> or <code>"disable"</code> is
accepted but ignored.
</p>
</dd>
<dt><code>"checkout"</code></dt>
<dd><p>Return true if the specified <var>feature</var> is installed, false otherwise.
An optional second output will have an error message if a package is not
installed.
</p>
</dd>
</dl>
<p><strong>See also:</strong> <a href="Installing-and-Removing-Packages.html#XREFpkg">pkg</a>, <a href="#XREFver">ver</a>, <a href="#XREFversion">version</a>.
</p></dd></dl>
<a name="XREFoctave_005fconfig_005finfo"></a><dl>
<dt><a name="index-octave_005fconfig_005finfo"></a>Built-in Function: <em></em> <strong>octave_config_info</strong> <em>()</em></dt>
<dt><a name="index-octave_005fconfig_005finfo-1"></a>Built-in Function: <em></em> <strong>octave_config_info</strong> <em>(<var>option</var>)</em></dt>
<dd><p>Return a structure containing configuration and installation information for
Octave.
</p>
<p>If <var>option</var> is a string, return the configuration information for the
specified option.
</p>
<p><strong>See also:</strong> <a href="#XREFcomputer">computer</a>.
</p></dd></dl>
<a name="XREFgetrusage"></a><dl>
<dt><a name="index-getrusage"></a>Built-in Function: <em></em> <strong>getrusage</strong> <em>()</em></dt>
<dd><p>Return a structure containing a number of statistics about the current
Octave process.
</p>
<p>Not all fields are available on all systems. If it is not possible to get
CPU time statistics, the CPU time slots are set to zero. Other missing data
are replaced by NaN. The list of possible fields is:
</p>
<dl compact="compact">
<dt><code>idrss</code></dt>
<dd><p>Unshared data size.
</p>
</dd>
<dt><code>inblock</code></dt>
<dd><p>Number of block input operations.
</p>
</dd>
<dt><code>isrss</code></dt>
<dd><p>Unshared stack size.
</p>
</dd>
<dt><code>ixrss</code></dt>
<dd><p>Shared memory size.
</p>
</dd>
<dt><code>majflt</code></dt>
<dd><p>Number of major page faults.
</p>
</dd>
<dt><code>maxrss</code></dt>
<dd><p>Maximum data size.
</p>
</dd>
<dt><code>minflt</code></dt>
<dd><p>Number of minor page faults.
</p>
</dd>
<dt><code>msgrcv</code></dt>
<dd><p>Number of messages received.
</p>
</dd>
<dt><code>msgsnd</code></dt>
<dd><p>Number of messages sent.
</p>
</dd>
<dt><code>nivcsw</code></dt>
<dd><p>Number of involuntary context switches.
</p>
</dd>
<dt><code>nsignals</code></dt>
<dd><p>Number of signals received.
</p>
</dd>
<dt><code>nswap</code></dt>
<dd><p>Number of swaps.
</p>
</dd>
<dt><code>nvcsw</code></dt>
<dd><p>Number of voluntary context switches.
</p>
</dd>
<dt><code>oublock</code></dt>
<dd><p>Number of block output operations.
</p>
</dd>
<dt><code>stime</code></dt>
<dd><p>A structure containing the system CPU time used. The structure has the
elements <code>sec</code> (seconds) <code>usec</code> (microseconds).
</p>
</dd>
<dt><code>utime</code></dt>
<dd><p>A structure containing the user CPU time used. The structure has the
elements <code>sec</code> (seconds) <code>usec</code> (microseconds).
</p></dd>
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