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<h3 class="section">13.4 Debug Mode</h3>
<p>There are two additional support functions that allow the user to
interrogate where in the execution of a script Octave entered the debug
mode and to print the code in the script surrounding the point where
Octave entered debug mode.
<!-- debug.cc -->
<p><a name="doc_002ddbwhere"></a>
<div class="defun">
— Loadable Function: <b>dbwhere</b> ()<var><a name="index-dbwhere-698"></a></var><br>
<blockquote><p>Show where we are in the code
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<p class="noindent"><strong>See also:</strong> <a href="doc_002ddbclear.html#doc_002ddbclear">dbclear</a>, <a href="doc_002ddbstatus.html#doc_002ddbstatus">dbstatus</a>, <a href="doc_002ddbstop.html#doc_002ddbstop">dbstop</a>.
</p></blockquote></div>
<!-- debug.cc -->
<p><a name="doc_002ddbtype"></a>
<div class="defun">
— Loadable Function: <b>dbtype</b> ()<var><a name="index-dbtype-699"></a></var><br>
<blockquote><p>List script file with line numbers.
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<p class="noindent"><strong>See also:</strong> <a href="doc_002ddbclear.html#doc_002ddbclear">dbclear</a>, <a href="doc_002ddbstatus.html#doc_002ddbstatus">dbstatus</a>, <a href="doc_002ddbstop.html#doc_002ddbstop">dbstop</a>.
</p></blockquote></div>
<p>You may also use <code>isdebugmode</code> to determine whether the debugger is
currently active.
<!-- debug.cc -->
<p><a name="doc_002disdebugmode"></a>
<div class="defun">
— Command: <b>isdebugmode</b> ()<var><a name="index-isdebugmode-700"></a></var><br>
<blockquote><p>Return true if debug mode is on, otherwise false.
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<p class="noindent"><strong>See also:</strong> <a href="doc_002ddbstack.html#doc_002ddbstack">dbstack</a>, <a href="doc_002ddbclear.html#doc_002ddbclear">dbclear</a>, <a href="doc_002ddbstop.html#doc_002ddbstop">dbstop</a>, <a href="doc_002ddbstatus.html#doc_002ddbstatus">dbstatus</a>.
</p></blockquote></div>
<p>Debug mode also allows single line stepping through a function using
the commands <code>dbstep</code>.
<!-- debug.cc -->
<p><a name="doc_002ddbstep"></a>
<div class="defun">
— Command: <b>dbstep</b><var> n<a name="index-dbstep-701"></a></var><br>
— Command: <b>dbstep</b><var> in<a name="index-dbstep-702"></a></var><br>
— Command: <b>dbstep</b><var> out<a name="index-dbstep-703"></a></var><br>
<blockquote><p>In debugging mode, execute the next <var>n</var> lines of code. If <var>n</var> is
omitted execute the next line of code. If the next line of code is itself
defined in terms of an m-file remain in the existing function.
<p>Using <code>dbstep in</code> will cause execution of the next line to step into
any m-files defined on the next line. Using <code>dbstep out</code> with cause
execution to continue until the current function returns.
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<p class="noindent"><strong>See also:</strong> <a href="doc_002ddbcont.html#doc_002ddbcont">dbcont</a>, <a href="doc_002ddbquit.html#doc_002ddbquit">dbquit</a>.
</p></blockquote></div>
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