<html lang="en"> <head> <title>Evaluation Notation - GNU Octave</title> <meta http-equiv="Content-Type" content="text/html"> <meta name="description" content="GNU Octave"> <meta name="generator" content="makeinfo 4.13"> <link title="Top" rel="start" href="index.html#Top"> <link rel="up" href="Conventions.html#Conventions" title="Conventions"> <link rel="prev" href="Fonts.html#Fonts" title="Fonts"> <link rel="next" href="Printing-Notation.html#Printing-Notation" title="Printing Notation"> <link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage"> <meta http-equiv="Content-Style-Type" content="text/css"> <style type="text/css"><!-- pre.display { font-family:inherit } pre.format { font-family:inherit } pre.smalldisplay { font-family:inherit; font-size:smaller } pre.smallformat { font-family:inherit; font-size:smaller } pre.smallexample { font-size:smaller } pre.smalllisp { font-size:smaller } span.sc { font-variant:small-caps } span.roman { font-family:serif; font-weight:normal; } span.sansserif { font-family:sans-serif; font-weight:normal; } --></style> </head> <body> <div class="node"> <a name="Evaluation-Notation"></a> <p> Next: <a rel="next" accesskey="n" href="Printing-Notation.html#Printing-Notation">Printing Notation</a>, Previous: <a rel="previous" accesskey="p" href="Fonts.html#Fonts">Fonts</a>, Up: <a rel="up" accesskey="u" href="Conventions.html#Conventions">Conventions</a> <hr> </div> <h4 class="subsection">1.3.2 Evaluation Notation</h4> <p><a name="index-evaluation-notation-11"></a><a name="index-documentation-notation-12"></a> In the examples in this manual, results from expressions that you evaluate are indicated with ‘<samp><span class="samp">⇒</span></samp>’. For example: <pre class="example"> sqrt (2) ⇒ 1.4142 </pre> <p class="noindent">You can read this as “<code>sqrt (2)</code> evaluates to 1.4142”. <p>In some cases, matrix values that are returned by expressions are displayed like this <pre class="example"> [1, 2; 3, 4] == [1, 3; 2, 4] ⇒ [ 1, 0; 0, 1 ] </pre> <p class="noindent">and in other cases, they are displayed like this <pre class="example"> eye (3) ⇒ 1 0 0 0 1 0 0 0 1 </pre> <p class="noindent">in order to clearly show the structure of the result. <p>Sometimes to help describe one expression, another expression is shown that produces identical results. The exact equivalence of expressions is indicated with ‘<samp><span class="samp">==</span></samp>’. For example: <pre class="example"> rot90 ([1, 2; 3, 4], -1) == rot90 ([1, 2; 3, 4], 3) == rot90 ([1, 2; 3, 4], 7) </pre> </body></html>