1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
|
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<!-- Created by GNU Texinfo 5.1, http://www.gnu.org/software/texinfo/ -->
<head>
<title>Maxima 5.47.0 Manual: Identifiers</title>
<meta name="description" content="Maxima 5.47.0 Manual: Identifiers">
<meta name="keywords" content="Maxima 5.47.0 Manual: Identifiers">
<meta name="resource-type" content="document">
<meta name="distribution" content="global">
<meta name="Generator" content="makeinfo">
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<link href="maxima_toc.html#Top" rel="start" title="Top">
<link href="maxima_423.html#Function-and-Variable-Index" rel="index" title="Function and Variable Index">
<link href="maxima_toc.html#SEC_Contents" rel="contents" title="Table of Contents">
<link href="maxima_28.html#Expressions" rel="up" title="Expressions">
<link href="maxima_32.html#Inequality" rel="next" title="Inequality">
<link href="maxima_30.html#Nouns-and-Verbs" rel="previous" title="Nouns and Verbs">
<style type="text/css">
<!--
a.summary-letter {text-decoration: none}
blockquote.smallquotation {font-size: smaller}
div.display {margin-left: 3.2em}
div.example {margin-left: 3.2em}
div.indentedblock {margin-left: 3.2em}
div.lisp {margin-left: 3.2em}
div.smalldisplay {margin-left: 3.2em}
div.smallexample {margin-left: 3.2em}
div.smallindentedblock {margin-left: 3.2em; font-size: smaller}
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.nocodebreak {white-space:nowrap}
span.nolinebreak {white-space:nowrap}
span.roman {font-family:serif; font-weight:normal}
span.sansserif {font-family:sans-serif; font-weight:normal}
ul.no-bullet {list-style: none}
body {color: black; background: white; margin-left: 8%; margin-right: 13%;
font-family: "FreeSans", sans-serif}
h1 {font-size: 150%; font-family: "FreeSans", sans-serif}
h2 {font-size: 125%; font-family: "FreeSans", sans-serif}
h3 {font-size: 100%; font-family: "FreeSans", sans-serif}
a[href] {color: rgb(0,0,255); text-decoration: none;}
a[href]:hover {background: rgb(220,220,220);}
div.textbox {border: solid; border-width: thin; padding-top: 1em;
padding-bottom: 1em; padding-left: 2em; padding-right: 2em}
div.titlebox {border: none; padding-top: 1em; padding-bottom: 1em;
padding-left: 2em; padding-right: 2em; background: rgb(200,255,255);
font-family: sans-serif}
div.synopsisbox {
border: none; padding-top: 1em; padding-bottom: 1em; padding-left: 2em;
padding-right: 2em; background: rgb(255,220,255);}
pre.example {border: 1px solid rgb(180,180,180); padding-top: 1em;
padding-bottom: 1em; padding-left: 1em; padding-right: 1em;
background-color: rgb(238,238,255)}
div.spacerbox {border: none; padding-top: 2em; padding-bottom: 2em}
div.image {margin: 0; padding: 1em; text-align: center}
div.categorybox {border: 1px solid gray; padding-top: 1em; padding-bottom: 1em;
padding-left: 1em; padding-right: 1em; background: rgb(247,242,220)}
img {max-width:80%; max-height: 80%; display: block; margin-left: auto; margin-right: auto}
-->
</style>
<link rel="icon" href="figures/favicon.ico">
<script src="https://polyfill.io/v3/polyfill.min.js?features=es6>"></script>
<script id="MathJax-script" async src="https://cdn.jsdelivr.net/npm/mathjax@3/es5/tex-mml-chtml.js"></script>
</head>
<body lang="en" bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#800080" alink="#FF0000">
<a name="Identifiers"></a>
<div class="header">
<p>
Next: <a href="maxima_32.html#Inequality" accesskey="n" rel="next">Inequality</a>, Previous: <a href="maxima_30.html#Nouns-and-Verbs" accesskey="p" rel="previous">Nouns and Verbs</a>, Up: <a href="maxima_28.html#Expressions" accesskey="u" rel="up">Expressions</a> [<a href="maxima_toc.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="maxima_423.html#Function-and-Variable-Index" title="Index" rel="index">Index</a>]</p>
</div>
<a name="Identifiers-1"></a>
<h3 class="section">6.3 Identifiers</h3>
<p>Maxima identifiers may comprise alphabetic characters, plus the numerals 0
through 9, plus any other character preceded by the backslash <code>\</code>
character.
</p>
<p>A numeral may be the first character of an identifier if it is preceded by a
backslash. Numerals which are the second or later characters need not be
preceded by a backslash.
</p>
<p>The alphabetic characters are initially <code>%</code>, <code>_</code>,
and all characters for which the Lisp function
<a href="http://www.lispworks.com/documentation/HyperSpec/Body/f_alpha_.htm"><code>ALPHA-CHAR-P</code></a> returns <code>true</code>.
Characters may be declared alphabetic by the <code>declare</code> function.
If so declared, they need not be preceded by a backslash in an identifier.
</p>
<p>Maxima is case-sensitive. The identifiers <code>foo</code>, <code>FOO</code>, and
<code>Foo</code> are distinct. See <a href="maxima_172.html#Lisp-and-Maxima">Lisp and Maxima</a> for more on this point.
</p>
<p>A Maxima identifier is a Lisp symbol which begins with a dollar sign <code>$</code>.
Any other Lisp symbol is preceded by a question mark <code>?</code> when it appears
in Maxima. See <a href="maxima_172.html#Lisp-and-Maxima">Lisp and Maxima</a> for more on this point.
</p>
<p>Examples:
</p>
<div class="example">
<pre class="example">(%i1) %an_ordinary_identifier42;
(%o1) %an_ordinary_identifier42
</pre><pre class="example">(%i2) embedded\ spaces\ in\ an\ identifier;
(%o2) embedded spaces in an identifier
</pre><pre class="example">(%i3) symbolp (%);
(%o3) true
</pre><pre class="example">(%i4) [foo+bar, foo\+bar];
(%o4) [foo + bar, foo+bar]
</pre><pre class="example">(%i5) [1729, \1729];
(%o5) [1729, 1729]
</pre><pre class="example">(%i6) [symbolp (foo\+bar), symbolp (\1729)];
(%o6) [true, true]
</pre><pre class="example">(%i7) [is (foo\+bar = foo+bar), is (\1729 = 1729)];
(%o7) [false, false]
</pre><pre class="example">(%i8) baz\~quux;
(%o8) baz~quux
</pre><pre class="example">(%i9) declare ("~", alphabetic);
(%o9) done
</pre><pre class="example">(%i10) baz~quux;
(%o10) baz~quux
</pre><pre class="example">(%i11) [is (foo = FOO), is (FOO = Foo), is (Foo = foo)];
(%o11) [false, false, false]
</pre><pre class="example">(%i12) :lisp (defvar *my-lisp-variable* '$foo)
*MY-LISP-VARIABLE*
</pre><pre class="example">(%i12) ?\*my\-lisp\-variable\*;
(%o12) foo
</pre></div>
<div class=categorybox>
Categories:<a href="maxima_424.html#Category_003a-Syntax">Syntax</a>
·</div>
<a name="Item_003a-Expressions_002fnode_002fInequality"></a><hr>
<div class="header">
<p>
Next: <a href="maxima_32.html#Inequality" accesskey="n" rel="next">Inequality</a>, Previous: <a href="maxima_30.html#Nouns-and-Verbs" accesskey="p" rel="previous">Nouns and Verbs</a>, Up: <a href="maxima_28.html#Expressions" accesskey="u" rel="up">Expressions</a> [<a href="maxima_toc.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="maxima_423.html#Function-and-Variable-Index" title="Index" rel="index">Index</a>]</p>
</div>
</body>
</html>
|
