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<a name="Call-Stack-1"></a>
<h3 class="section">13.5 Call Stack</h3>
<p>The function being debugged may be the leaf node of a series of function calls.
After examining values in the current subroutine it may turn out that the
problem occurred in earlier pieces of code. Use <code>dbup</code> and <code>dbdown</code>
to move up and down through the series of function calls to locate where
variables first took on the wrong values. <code>dbstack</code> shows the entire
series of function calls and at what level debugging is currently taking place.
</p>
<a name="XREFdbstack"></a><dl>
<dt><a name="index-dbstack"></a>Command: <em></em> <strong>dbstack</strong></dt>
<dt><a name="index-dbstack-1"></a>Command: <em></em> <strong>dbstack</strong> <em><var>n</var></em></dt>
<dt><a name="index-dbstack-2"></a>Command: <em></em> <strong>dbstack</strong> <em><var>-completenames</var></em></dt>
<dt><a name="index-dbstack-3"></a>Built-in Function: <em>[<var>stack</var>, <var>idx</var>] =</em> <strong>dbstack</strong> <em>(…)</em></dt>
<dd><p>Display or return current debugging function stack information.
With optional argument <var>n</var>, omit the <var>n</var> innermost stack frames.
</p>
<p>Although accepted, the argument <var>-completenames</var> is silently ignored.
Octave always returns absolute file names. The arguments <var>n</var> and
<var>-completenames</var> can be both specified in any order.
</p>
<p>The optional return argument <var>stack</var> is a struct array with the
following fields:
</p>
<dl compact="compact">
<dt>file</dt>
<dd><p>The name of the m-file where the function code is located.
</p>
</dd>
<dt>name</dt>
<dd><p>The name of the function with a breakpoint.
</p>
</dd>
<dt>line</dt>
<dd><p>The line number of an active breakpoint.
</p>
</dd>
<dt>column</dt>
<dd><p>The column number of the line where the breakpoint begins.
</p>
</dd>
<dt>scope</dt>
<dd><p>Undocumented.
</p>
</dd>
<dt>context</dt>
<dd><p>Undocumented.
</p></dd>
</dl>
<p>The return argument <var>idx</var> specifies which element of the <var>stack</var>
struct array is currently active.
</p>
<p><strong>See also:</strong> <a href="#XREFdbup">dbup</a>, <a href="#XREFdbdown">dbdown</a>, <a href="Debug-Mode.html#XREFdbwhere">dbwhere</a>, <a href="Breakpoints.html#XREFdbstatus">dbstatus</a>.
</p></dd></dl>
<a name="XREFdbup"></a><dl>
<dt><a name="index-dbup"></a>Built-in Function: <em></em> <strong>dbup</strong></dt>
<dt><a name="index-dbup-1"></a>Built-in Function: <em></em> <strong>dbup</strong> <em>(<var>n</var>)</em></dt>
<dd><p>In debugging mode, move up the execution stack <var>n</var> frames.
If <var>n</var> is omitted, move up one frame.
</p>
<p><strong>See also:</strong> <a href="#XREFdbstack">dbstack</a>, <a href="#XREFdbdown">dbdown</a>.
</p></dd></dl>
<a name="XREFdbdown"></a><dl>
<dt><a name="index-dbdown"></a>Built-in Function: <em></em> <strong>dbdown</strong></dt>
<dt><a name="index-dbdown-1"></a>Built-in Function: <em></em> <strong>dbdown</strong> <em>(<var>n</var>)</em></dt>
<dd><p>In debugging mode, move down the execution stack <var>n</var> frames.
If <var>n</var> is omitted, move down one frame.
</p>
<p><strong>See also:</strong> <a href="#XREFdbstack">dbstack</a>, <a href="#XREFdbup">dbup</a>.
</p></dd></dl>
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