<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <!-- Created by GNU Texinfo 6.5, http://www.gnu.org/software/texinfo/ --> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <title>Entering Debug Mode (GNU Octave (version 5.1.0))</title> <meta name="description" content="Entering Debug Mode (GNU Octave (version 5.1.0))"> <meta name="keywords" content="Entering Debug Mode (GNU Octave (version 5.1.0))"> <meta name="resource-type" content="document"> <meta name="distribution" content="global"> <meta name="Generator" content="makeinfo"> <link href="index.html#Top" rel="start" title="Top"> <link href="Concept-Index.html#Concept-Index" rel="index" title="Concept Index"> <link href="index.html#SEC_Contents" rel="contents" title="Table of Contents"> <link href="Debugging.html#Debugging" rel="up" title="Debugging"> <link href="Leaving-Debug-Mode.html#Leaving-Debug-Mode" rel="next" title="Leaving Debug Mode"> <link href="Debugging.html#Debugging" rel="prev" title="Debugging"> <style type="text/css"> <!-- a.summary-letter {text-decoration: none} blockquote.indentedblock {margin-right: 0em} blockquote.smallindentedblock {margin-right: 0em; font-size: smaller} blockquote.smallquotation {font-size: smaller} div.display {margin-left: 3.2em} div.example {margin-left: 3.2em} div.lisp {margin-left: 3.2em} div.smalldisplay {margin-left: 3.2em} div.smallexample {margin-left: 3.2em} div.smalllisp {margin-left: 3.2em} kbd {font-style: oblique} pre.display {font-family: inherit} pre.format {font-family: inherit} pre.menu-comment {font-family: serif} pre.menu-preformatted {font-family: serif} pre.smalldisplay {font-family: inherit; font-size: smaller} pre.smallexample {font-size: smaller} pre.smallformat {font-family: inherit; font-size: smaller} pre.smalllisp {font-size: smaller} span.nolinebreak {white-space: nowrap} span.roman {font-family: initial; font-weight: normal} span.sansserif {font-family: sans-serif; font-weight: normal} ul.no-bullet {list-style: none} --> </style> <link rel="stylesheet" type="text/css" href="octave.css"> </head> <body lang="en"> <a name="Entering-Debug-Mode"></a> <div class="header"> <p> Next: <a href="Leaving-Debug-Mode.html#Leaving-Debug-Mode" accesskey="n" rel="next">Leaving Debug Mode</a>, Up: <a href="Debugging.html#Debugging" accesskey="u" rel="up">Debugging</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html#Concept-Index" title="Index" rel="index">Index</a>]</p> </div> <hr> <a name="Entering-Debug-Mode-1"></a> <h3 class="section">13.1 Entering Debug Mode</h3> <p>There are two basic means of interrupting the execution of an Octave script. These are breakpoints (see <a href="Breakpoints.html#Breakpoints">Breakpoints</a>), discussed in the next section, and interruption based on some condition. </p> <p>Octave supports three means to stop execution based on the values set in the functions <code>debug_on_interrupt</code>, <code>debug_on_warning</code>, and <code>debug_on_error</code>. </p> <a name="XREFdebug_005fon_005finterrupt"></a><dl> <dt><a name="index-debug_005fon_005finterrupt"></a><em><var>val</var> =</em> <strong>debug_on_interrupt</strong> <em>()</em></dt> <dt><a name="index-debug_005fon_005finterrupt-1"></a><em><var>old_val</var> =</em> <strong>debug_on_interrupt</strong> <em>(<var>new_val</var>)</em></dt> <dt><a name="index-debug_005fon_005finterrupt-2"></a><em></em> <strong>debug_on_interrupt</strong> <em>(<var>new_val</var>, "local")</em></dt> <dd><p>Query or set the internal variable that controls whether Octave will try to enter debugging mode when it receives an interrupt signal (typically generated with <kbd>C-c</kbd>). </p> <p>If a second interrupt signal is received before reaching the debugging mode, a normal interrupt will occur. </p> <p>When called from inside a function with the <code>"local"</code> option, the variable is changed locally for the function and any subroutines it calls. The original variable value is restored when exiting the function. </p> <p><strong>See also:</strong> <a href="#XREFdebug_005fon_005ferror">debug_on_error</a>, <a href="#XREFdebug_005fon_005fwarning">debug_on_warning</a>. </p></dd></dl> <a name="XREFdebug_005fon_005fwarning"></a><dl> <dt><a name="index-debug_005fon_005fwarning"></a><em><var>val</var> =</em> <strong>debug_on_warning</strong> <em>()</em></dt> <dt><a name="index-debug_005fon_005fwarning-1"></a><em><var>old_val</var> =</em> <strong>debug_on_warning</strong> <em>(<var>new_val</var>)</em></dt> <dt><a name="index-debug_005fon_005fwarning-2"></a><em></em> <strong>debug_on_warning</strong> <em>(<var>new_val</var>, "local")</em></dt> <dd><p>Query or set the internal variable that controls whether Octave will try to enter the debugger when a warning is encountered. </p> <p>When called from inside a function with the <code>"local"</code> option, the variable is changed locally for the function and any subroutines it calls. The original variable value is restored when exiting the function. </p> <p><strong>See also:</strong> <a href="#XREFdebug_005fon_005ferror">debug_on_error</a>, <a href="#XREFdebug_005fon_005finterrupt">debug_on_interrupt</a>. </p></dd></dl> <a name="XREFdebug_005fon_005ferror"></a><dl> <dt><a name="index-debug_005fon_005ferror"></a><em><var>val</var> =</em> <strong>debug_on_error</strong> <em>()</em></dt> <dt><a name="index-debug_005fon_005ferror-1"></a><em><var>old_val</var> =</em> <strong>debug_on_error</strong> <em>(<var>new_val</var>)</em></dt> <dt><a name="index-debug_005fon_005ferror-2"></a><em></em> <strong>debug_on_error</strong> <em>(<var>new_val</var>, "local")</em></dt> <dd><p>Query or set the internal variable that controls whether Octave will try to enter the debugger when an error is encountered. </p> <p>This will also inhibit printing of the normal traceback message (you will only see the top-level error message). </p> <p>When called from inside a function with the <code>"local"</code> option, the variable is changed locally for the function and any subroutines it calls. The original variable value is restored when exiting the function. </p> <p><strong>See also:</strong> <a href="#XREFdebug_005fon_005fwarning">debug_on_warning</a>, <a href="#XREFdebug_005fon_005finterrupt">debug_on_interrupt</a>. </p></dd></dl> <hr> <div class="header"> <p> Next: <a href="Leaving-Debug-Mode.html#Leaving-Debug-Mode" accesskey="n" rel="next">Leaving Debug Mode</a>, Up: <a href="Debugging.html#Debugging" accesskey="u" rel="up">Debugging</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html#Concept-Index" title="Index" rel="index">Index</a>]</p> </div> </body> </html>