<?xml version="1.0" encoding="utf-8" ?> <!-- for emacs: -*- coding: utf-8 -*- --> <!-- Apache may like this line in the file .htaccess: AddCharset utf-8 .html --> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1 plus MathML 2.0 plus SVG 1.1//EN" "http://www.w3.org/2002/04/xhtml-math-svg/xhtml-math-svg-flat.dtd" > <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en"> <head><title>ii -- the square root of -1</title> <link rel="stylesheet" type="text/css" href="../../../../Macaulay2/Style/doc.css"/> </head> <body> <table class="buttons"> <tr> <td><div><a href="_image.html">next</a> | <a href="___Ignore__Example__Errors.html">previous</a> | <a href="_image.html">forward</a> | <a href="___Ignore__Example__Errors.html">backward</a> | up | <a href="index.html">top</a> | <a href="master.html">index</a> | <a href="toc.html">toc</a> | <a href="http://www.math.uiuc.edu/Macaulay2/">Macaulay2 web site</a></div> </td> </tr> </table> <hr/> <div><h1>ii -- the square root of -1</h1> <div class="single"><h2>Synopsis</h2> <ul><li><div class="list"><dl class="element"><dt class="heading">Usage: </dt><dd class="value"><div><tt>ii</tt></div> </dd></dl> </div> </li> <li><div class="single">Outputs:<ul><li><span><span>a <a href="___C__C.html">complex number</a></span>, the square root of -1, converted to a numeric value of the correct precision, when necessary.</span></li> </ul> </div> </li> </ul> </div> <div class="single"><h2>Description</h2> <div><table class="examples"><tr><td><pre>i1 : ii o1 = ii o1 : Constant</pre> </td></tr> <tr><td><pre>i2 : ii+1p100 o2 = 1+ii o2 : CC (of precision 100)</pre> </td></tr> <tr><td><pre>i3 : numeric ii o3 = ii o3 : CC (of precision 53)</pre> </td></tr> <tr><td><pre>i4 : numeric_100 ii o4 = ii o4 : CC (of precision 100)</pre> </td></tr> </table> Here is the simplest way to convert ii to a numeric value:<table class="examples"><tr><td><pre>i5 : +ii o5 = ii o5 : CC (of precision 53)</pre> </td></tr> </table> </div> </div> <div class="single"><h2>See also</h2> <ul><li><span><a href="_numeric.html" title="convert to floating point">numeric</a> -- convert to floating point</span></li> </ul> </div> <div class="waystouse"><h2>For the programmer</h2> <p>The object <a href="_ii.html" title="the square root of -1">ii</a> is <span>an object of class <a href="___Constant.html" title="">Constant</a></span>.</p> </div> </div> </body> </html>