288 lines
5.7 KiB
HTML
288 lines
5.7 KiB
HTML
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<!DOCTYPE HTML>
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<HTML LANG="en-us"
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><HEAD
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><TITLE
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>random | Common Lisp Nova Spec</TITLE
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><META CHARSET="US-ASCII"
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><LINK REL="canonical" HREF="f_random.html"
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><LINK REL="next" HREF="f_random-state-p.html" TYPE="text/html" TITLE="random-state-p"
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><LINK REL="prev" HREF="f_make-random-state.html" TYPE="text/html" TITLE="make-random-state"
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><LINK REL="up" HREF="12_2_Numbers_Dictionary.html" TYPE="text/html" TITLE="12.2 Numbers Dictionary"
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><LINK REL="start" HREF="index.html" TYPE="text/html" TITLE="Common Lisp Nova Spec"
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><META NAME="VIEWPORT" CONTENT="width=device-width, initial-scale=1.0"
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><LINK REL="STYLESHEET" HREF="dpans.css%3F3909942064.css"
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><SCRIPT SRC="dpans.js%3F3909942064"
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></SCRIPT
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><SCRIPT SRC="apropos.js%3F3909942064"
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></SCRIPT
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></HEAD
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><BODY
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><DIV
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><DIV CLASS="topnav"
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><DIV CLASS="breadcrumb"
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><SPAN CLASS="breadcrumb-item"
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><A HREF="index.html"
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>Common Lisp Nova Spec</A
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></SPAN
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> <SPAN CLASS="breadcrumb-item"
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>→ <A HREF="12_Numbers.html"
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>12. Numbers</A
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></SPAN
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> <SPAN CLASS="breadcrumb-item"
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>→ <A HREF="12_2_Numbers_Dictionary.html"
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>12.2 Numbers Dictionary</A
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></SPAN
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> <SPAN CLASS="breadcrumb-item"
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>→ <A HREF="f_random.html"
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>random</A
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></SPAN
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></DIV
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><DIV CLASS="apropos"
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><DIV CLASS="apropos-io"
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><A HREF="f_make-random-state.html" CLASS="prev"
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>←</A
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><SPAN ID="apropos-label"
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>Apropos </SPAN
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><INPUT ID="apropos" AUTOFOCUS="AUTOFOCUS" PLACEHOLDER="Type here to search" ONINPUT="aproposInput(this);" ONKEYUP="aproposKeyup(event);" ONCHANGE="aproposChange(this);" ONFOCUS="aproposFocus(this);" ONFOCUSOUT="aproposFocusout(this);"
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><A HREF="f_random-state-p.html" CLASS="next"
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>→</A
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></DIV
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><DIV ID="apropos-res"
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></DIV
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></DIV
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></DIV
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><DIV CLASS="matter"
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><DIV CLASS="com"
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><DIV CLASS="begincom"
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><HR
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><TABLE WIDTH="100%" CELLSPACING="0" CELLPADDING="0"
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><TR
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><TD ALIGN="LEFT" VALIGN="BASELINE" WIDTH="100%" CLASS="name"
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><SPAN CLASS="idx" DATA-KIND="idxref" DATA-TERM="random"
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></SPAN
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><B
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>random</B
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></TD
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><TD ALIGN="RIGHT" VALIGN="BASELINE" WIDTH="0" NOWRAP="NOWRAP" CLASS="ftype"
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><I
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>Function</I
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></TD
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></TR
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></TABLE
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><HR
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></DIV
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><UL CLASS="subtoc"
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></UL
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><DL
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><DT
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><B
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>Syntax</B
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></DT
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><DD
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><P CLASS="j"
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><B
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>random</B
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> <SPAN CLASS="cmssi"
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>limit</SPAN
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> <SPAN CLASS="cmtt"
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>&optional</SPAN
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> <SPAN CLASS="cmssi"
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>random-state</SPAN
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> <SPAN CLASS="arrow"
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>→</SPAN
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> <SPAN CLASS="cmssi"
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>random-number</SPAN
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></P
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></DD
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><DT
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><B
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>Arguments and Values</B
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></DT
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><DD
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><P CLASS="j"
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><VAR CLASS="param"
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>limit</VAR
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> — a positive <A HREF="26_1_Glossary.html#integer"
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><EM CLASS="term"
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>integer</EM
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></A
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>, or a positive <A HREF="26_1_Glossary.html#float"
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><EM CLASS="term"
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>float</EM
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></A
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>. </P
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><P CLASS="j"
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><VAR CLASS="param"
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>random-state</VAR
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> — a <A HREF="26_1_Glossary.html#random_state"
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><EM CLASS="term"
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>random state</EM
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></A
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>. The default is the <A HREF="26_1_Glossary.html#current_random_state"
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><EM CLASS="term"
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>current random state</EM
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></A
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>. </P
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><P CLASS="j"
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><VAR CLASS="param"
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>random-number</VAR
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> — a non-negative <A HREF="26_1_Glossary.html#number"
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><EM CLASS="term"
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>number</EM
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></A
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> less than <VAR CLASS="param"
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>limit</VAR
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> and of the same <A HREF="26_1_Glossary.html#type"
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><EM CLASS="term"
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>type</EM
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></A
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> as <VAR CLASS="param"
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>limit</VAR
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>.</P
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></DD
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><DT
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><B
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>Description</B
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></DT
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><DD
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><P CLASS="j"
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>Returns a pseudo-random number that is a non-negative <A HREF="26_1_Glossary.html#number"
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><EM CLASS="term"
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>number</EM
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></A
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> less than <VAR CLASS="param"
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>limit</VAR
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> and of the same <A HREF="26_1_Glossary.html#type"
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><EM CLASS="term"
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>type</EM
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></A
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> as <VAR CLASS="param"
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>limit</VAR
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>. </P
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><P CLASS="j"
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>The <VAR CLASS="param"
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>random-state</VAR
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>, which is modified by this function, encodes the internal state maintained by the random number generator. </P
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><P CLASS="j"
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>An approximately uniform choice distribution is used. If <VAR CLASS="param"
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>limit</VAR
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> is an <A HREF="26_1_Glossary.html#integer"
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><EM CLASS="term"
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>integer</EM
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></A
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>, each of the possible results occurs with (approximate) probability 1/<VAR CLASS="param"
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>limit</VAR
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>.</P
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></DD
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><DT
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><B
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>Examples</B
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></DT
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><DD
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><PRE CLASS="screen"
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>(<= 0 (random 1000) 1000) <SPAN CLASS="cmsy"
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><SPAN CLASS="arrow"
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>→</SPAN
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></SPAN
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> <A HREF="26_1_Glossary.html#true"
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><EM CLASS="term"
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>true</EM
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></A
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>
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(let ((state1 (make-random-state))
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(state2 (make-random-state)))
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(= (random 1000 state1) (random 1000 state2))) <SPAN CLASS="cmsy"
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><SPAN CLASS="arrow"
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>→</SPAN
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></SPAN
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> <A HREF="26_1_Glossary.html#true"
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><EM CLASS="term"
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>true</EM
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></A
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></PRE
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></DD
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><DT
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><B
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>Side Effects</B
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></DT
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><DD
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><P CLASS="j"
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>The <VAR CLASS="param"
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>random-state</VAR
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> is modified.</P
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></DD
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><DT
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><B
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>Exceptional Situations</B
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></DT
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><DD
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><P CLASS="j"
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>Should signal an error of <A HREF="26_1_Glossary.html#type"
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><EM CLASS="term"
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>type</EM
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></A
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> <A HREF="t_type-error.html" CLASS="typeref"
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><B
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>type-error</B
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></A
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> if <VAR CLASS="param"
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>limit</VAR
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> is not a positive <A HREF="26_1_Glossary.html#integer"
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><EM CLASS="term"
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>integer</EM
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></A
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> or a positive <EM CLASS="term"
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>real</EM
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>.</P
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></DD
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><DT
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><B
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>See Also</B
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></DT
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><DD
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><P CLASS="j"
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><A HREF="f_make-random-state.html" CLASS="funref"
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><B
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>make-random-state</B
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></A
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>, <A HREF="v_random-state.html" CLASS="varref"
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><B
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>*random-state*</B
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></A
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></P
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></DD
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><DT
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><B
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>Notes</B
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></DT
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><DD
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><P CLASS="j"
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>See <I
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>Common</I
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> <I
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>Lisp:</I
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> <I
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>The</I
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> <I
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>Language</I
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> for information about generating random numbers.</P
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></DD
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></DL
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></DIV
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></DIV
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><DIV CLASS="footer"
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><DIV CLASS="btmnav"
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><A HREF="f_make-random-state.html" CLASS="prev"
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>←</A
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><A HREF="f_random-state-p.html" CLASS="next"
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>→</A
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></DIV
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><DIV CLASS="trail"
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>Conversion to HTML copyright 2023 by Gilbert Baumann</DIV
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></DIV
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></DIV
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><SCRIPT
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>domReady();</SCRIPT
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></BODY
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></HTML
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>
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