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<!DOCTYPE html> <html lang="en"> <head> <title>List # ZZ -- get value from list, hash table, database, dictionary, or string</title> <meta content="text/html; charset=utf-8" http-equiv="Content-Type"> <link type="text/css" rel="stylesheet" href="../../../../Macaulay2/Style/doc.css"> <link rel="stylesheet" href="../../../../Macaulay2/Style/katex/katex.min.css"> <script defer="defer" src="../../../../Macaulay2/Style/katex/katex.min.js"></script> <script defer="defer" src="../../../../Macaulay2/Style/katex/contrib/auto-render.min.js"></script> <script> var macros = { "\\break": "\\\\", "\\ZZ": "\\mathbb{Z}", "\\NN": "\\mathbb{N}", "\\QQ": "\\mathbb{Q}", "\\RR": "\\mathbb{R}", "\\CC": "\\mathbb{C}", "\\PP": "\\mathbb{P}" }, delimiters = [ { left: "$$", right: "$$", display: true}, { left: "\\[", right: "\\]", display: true}, { left: "$", right: "$", display: false}, { left: "\\(", right: "\\)", display: false} ], ignoredTags = [ "kbd", "var", "samp", "script", "noscript", "style", "textarea", "pre", "code", "option" ]; document.addEventListener("DOMContentLoaded", function() { renderMathInElement(document.body, { delimiters: delimiters, macros: macros, ignoredTags: ignoredTags, trust: true }); }); </script> <style>.katex { font-size: 1em; }</style> <script defer="defer" src="../../../../Macaulay2/Style/katex/contrib/copy-tex.min.js"></script> <script defer="defer" src="../../../../Macaulay2/Style/katex/contrib/render-a11y-string.min.js"></script> <script src="../../../../Macaulay2/Style/prism.js"></script> <script>var current_version = '1.25.06';</script> <script src="../../../../Macaulay2/Style/version-select.js"></script> <link type="image/x-icon" rel="icon" href="../../../../Macaulay2/Style/icon.gif"> </head> <body> <div id="buttons"> <div> <a href="https://macaulay2.com/">Macaulay2</a> <span id="version-select-container"></span> » <a title="Macaulay2 documentation" href="index.html">Documentation </a> <br><a href="_packages_spprovided_spwith_sp__Macaulay2.html">Packages</a> » <span><a title="Macaulay2 documentation" href="index.html">Macaulay2Doc</a> » <a href="___The_sp__Macaulay2_splanguage.html">The Macaulay2 language</a> » <a title="a detailed overview of lists and sequences in Macaulay2" href="_lists_spand_spsequences.html">lists and sequences</a> » <a title="get value from list, hash table, database, dictionary, or string" href="___List_sp_sh_sp__Z__Z.html">List # ZZ</a></span> </div> <div class="right"> <form method="get" action="https://www.google.com/search"> <input placeholder="Search" type="text" name="q" value=""> <input type="hidden" name="q" value="site:macaulay2.com/doc"> </form> <a href="___Visible__List_sp_us_sp__Z__Z.html">next</a> | <a href="_is__Empty.html">previous</a> | <a href="___Visible__List_sp_us_sp__Z__Z.html">forward</a> | <a href="_is__Empty.html">backward</a> | <a href="_lists_spand_spsequences.html">up</a> | <a href="master.html">index</a> | <a href="toc.html">toc</a> </div> </div> <hr> <div> <h1>List # ZZ -- get value from list, hash table, database, dictionary, or string</h1> <ul> <li><span>Operator: <a title="length or access to elements" href="__sh.html">#</a></span></li> <li> <dl class="element"> <dt>Usage: </dt> <dd><code class="language-macaulay2">x#i</code></dd> </dl> </li> <li>Inputs: <ul> <li><span><span class="tt">x</span>, <span>a <a title="the class of all lists -- {...}" href="___List.html">list</a></span>, <span>a <a title="the class of all hash tables" href="___Hash__Table.html">hash table</a></span>, <span>a <a title="the class of all database files" href="___Database.html">database</a></span>, or <span>a <a title="the class of all strings" href="___String.html">string</a></span>, </span></li> <li><span><span class="tt">i</span>, <span>an <a title="the class of all integers" href="___Z__Z.html">integer</a></span>, an index or key</span></li> </ul> </li> </ul> <div> <h2>Description</h2> <div> <p>If <span class="tt">x</span> is a list, <span class="tt">x#i</span> returns the <span class="tt">i</span>th element of <span class="tt">x</span>. The entries of the list are numbered starting with 0. If <span class="tt">i</span> is negative, then the entries are numbered ending with -1. If <span class="tt">i</span> is out of range, an error is signaled.</p> </div> <table class="examples"> <tr> <td> <pre><code class="language-macaulay2">i1 : L = {a, b, c, b, a};</code></pre> </td> </tr> <tr> <td> <pre><code class="language-macaulay2">i2 : L#2 o2 = c o2 : Symbol</code></pre> </td> </tr> <tr> <td> <pre><code class="language-macaulay2">i3 : L#-2 o3 = b o3 : Symbol</code></pre> </td> </tr> </table> <div> <p>If <span class="tt">x</span> is a hash table or database, <span class="tt">x#i</span> provides the value associated with the key <span class="tt">i</span>.</p> </div> <table class="examples"> <tr> <td> <pre><code class="language-macaulay2">i4 : T = new HashTable from {a => 103, b => 89.4, c => 92};</code></pre> </td> </tr> <tr> <td> <pre><code class="language-macaulay2">i5 : T#a o5 = 103</code></pre> </td> </tr> <tr> <td> <pre><code class="language-macaulay2">i6 : T#b o6 = 89.40000000000001 o6 : RR (of precision 53)</code></pre> </td> </tr> </table> <div> <p>If <span class="tt">x</span> is a string, <span class="tt">x#i</span> provides the <span class="tt">i</span>th character of <span class="tt">x</span>, if there is one. Negative indices are counted backward from the end, as with lists. If <span class="tt">i</span> is out of range, an error is thrown.</p> </div> <table class="examples"> <tr> <td> <pre><code class="language-macaulay2">i7 : s = "a perfectly adequate example of a string";</code></pre> </td> </tr> <tr> <td> <pre><code class="language-macaulay2">i8 : s#2 o8 = p</code></pre> </td> </tr> <tr> <td> <pre><code class="language-macaulay2">i9 : s#-2 o9 = n</code></pre> </td> </tr> </table> <div> <p>Assignment to <span class="tt">x#i</span> can change <span class="tt">x</span> if <span class="tt">x</span> is mutable.</p> </div> <table class="examples"> <tr> <td> <pre><code class="language-macaulay2">i10 : V = new MutableHashTable from T;</code></pre> </td> </tr> <tr> <td> <pre><code class="language-macaulay2">i11 : V#a = 5;</code></pre> </td> </tr> <tr> <td> <pre><code class="language-macaulay2">i12 : V#d = 22.3;</code></pre> </td> </tr> <tr> <td> <pre><code class="language-macaulay2">i13 : peek V o13 = MutableHashTable{a => 5 } b => 89.4 c => 92 d => 22.3</code></pre> </td> </tr> </table> </div> <div> <h2>See also</h2> <ul> <li><span><a title="length or access to elements" href="__sh.html">#</a> -- length or access to elements</span></li> <li><span><a title="check existence of value in a list, hash table, database, or string" href="__sh_qu.html">#?</a> -- check existence of value in a list, hash table, database, or string</span></li> <li><span><a title="length or cardinality of a list, hash table, dictionary, set, or string" href="__sh_sp__List.html"># BasicList</a> -- length or cardinality of a list, hash table, dictionary, set, or string</span></li> <li><span><a title="get element from list" href="___Visible__List_sp_us_sp__Z__Z.html">VisibleList _ ZZ</a> -- get element from list</span></li> <li><span><a href="_hash_sptables.html">hash tables</a></span></li> <li><span><a title="a detailed overview of lists and sequences in Macaulay2" href="_lists_spand_spsequences.html">lists and sequences</a> -- a detailed overview of lists and sequences in Macaulay2</span></li> </ul> </div> <div> <div class="waystouse"> <h2>Ways to use this method:</h2> <ul> <li><kbd>BasicList # ZZ</kbd></li> <li><kbd>Database # String</kbd></li> <li><kbd>Dictionary # String</kbd></li> <li><kbd>HashTable # Thing</kbd></li> <li><span><a title="get value from list, hash table, database, dictionary, or string" href="___List_sp_sh_sp__Z__Z.html">List # ZZ</a> -- get value from list, hash table, database, dictionary, or string</span></li> <li><kbd>Net # ZZ</kbd></li> <li><kbd>Sequence # ZZ</kbd></li> <li><kbd>String # ZZ</kbd></li> </ul> </div> <hr> <div class="waystouse"> <p>The source of this document is in <span class="tt">Macaulay2Doc/ov_hashtables.m2:817:0</span>.</p> </div> </div> </div> </body> </html>