<!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>Enabling and Disabling Warnings (GNU Octave (version 5.1.0))</title> <meta name="description" content="Enabling and Disabling Warnings (GNU Octave (version 5.1.0))"> <meta name="keywords" content="Enabling and Disabling Warnings (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="Handling-Warnings.html#Handling-Warnings" rel="up" title="Handling Warnings"> <link href="Debugging.html#Debugging" rel="next" title="Debugging"> <link href="Issuing-Warnings.html#Issuing-Warnings" rel="prev" title="Issuing Warnings"> <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="Enabling-and-Disabling-Warnings"></a> <div class="header"> <p> Previous: <a href="Issuing-Warnings.html#Issuing-Warnings" accesskey="p" rel="prev">Issuing Warnings</a>, Up: <a href="Handling-Warnings.html#Handling-Warnings" accesskey="u" rel="up">Handling Warnings</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="Enabling-and-Disabling-Warnings-1"></a> <h4 class="subsection">12.2.2 Enabling and Disabling Warnings</h4> <p>The <code>warning</code> function also allows you to control which warnings are actually printed to the screen. If the <code>warning</code> function is called with a string argument that is either <code>"on"</code> or <code>"off"</code> all warnings will be enabled or disabled. </p> <p>It is also possible to enable and disable individual warnings through their string identifications. The following code will issue a warning </p> <div class="example"> <pre class="example">warning ("example:non-negative-variable", "'a' must be non-negative. Setting 'a' to zero."); </pre></div> <p>while the following won’t issue a warning </p> <div class="example"> <pre class="example">warning ("off", "example:non-negative-variable"); warning ("example:non-negative-variable", "'a' must be non-negative. Setting 'a' to zero."); </pre></div> </body> </html>