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281 lines
No EOL
5.5 KiB
HTML
<!DOCTYPE HTML>
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<HTML LANG="en-us"
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>copy-seq | Common Lisp Nova Spec</TITLE
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>Common Lisp Nova Spec</A
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> <SPAN CLASS="breadcrumb-item"
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>→ <A HREF="17_Sequences.html"
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>17. Sequences</A
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> <SPAN CLASS="breadcrumb-item"
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>→ <A HREF="f_copy-seq.html"
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>copy-seq</A
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><A HREF="t_sequence.html" CLASS="prev"
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>←</A
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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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><DIV CLASS="matter"
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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="copy-seq"
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></SPAN
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><B
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>copy-seq</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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>copy-seq</B
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> <SPAN CLASS="cmssi"
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>sequence</SPAN
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> <SPAN CLASS="arrow"
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>→</SPAN
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> <SPAN CLASS="cmssi"
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>copied-sequence</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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>sequence</VAR
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> — a <A HREF="26_1_Glossary.html#proper_sequence"
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><EM CLASS="term"
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>proper sequence</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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>copied-sequence</VAR
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> — a <A HREF="26_1_Glossary.html#proper_sequence"
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><EM CLASS="term"
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>proper sequence</EM
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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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>Description</B
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></DT
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><DD
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><P CLASS="j"
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>Creates a copy of <VAR CLASS="param"
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>sequence</VAR
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>. The <A HREF="26_1_Glossary.html#element"
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><EM CLASS="term"
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>elements</EM
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></A
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> of the new <A HREF="26_1_Glossary.html#sequence"
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><EM CLASS="term"
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>sequence</EM
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></A
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> are the <A HREF="26_1_Glossary.html#same"
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><EM CLASS="term"
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>same</EM
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></A
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> as the corresponding <A HREF="26_1_Glossary.html#element"
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><EM CLASS="term"
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>elements</EM
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></A
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> of the given <VAR CLASS="param"
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>sequence</VAR
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>. </P
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><P CLASS="j"
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>If <VAR CLASS="param"
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>sequence</VAR
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> is a <A HREF="26_1_Glossary.html#vector"
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><EM CLASS="term"
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>vector</EM
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></A
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>, the result is a <A HREF="26_1_Glossary.html#fresh"
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><EM CLASS="term"
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>fresh</EM
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></A
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> <A HREF="26_1_Glossary.html#simple_array"
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><EM CLASS="term"
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>simple array</EM
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></A
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> of <A HREF="26_1_Glossary.html#rank"
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><EM CLASS="term"
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>rank</EM
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></A
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> one that has the same <A HREF="26_1_Glossary.html#actual_array_element_type"
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><EM CLASS="term"
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>actual array element type</EM
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></A
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> as <VAR CLASS="param"
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>sequence</VAR
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>. If <VAR CLASS="param"
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>sequence</VAR
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> is a <A HREF="26_1_Glossary.html#list"
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><EM CLASS="term"
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>list</EM
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></A
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>, the result is a <A HREF="26_1_Glossary.html#fresh"
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><EM CLASS="term"
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>fresh</EM
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></A
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> <A HREF="26_1_Glossary.html#list"
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><EM CLASS="term"
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>list</EM
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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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>Examples</B
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></DT
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><DD
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><PRE CLASS="screen"
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>(setq str "a string") <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 string"
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(equalp str (copy-seq str)) <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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(eql str (copy-seq str)) <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#false"
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><EM CLASS="term"
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>false</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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>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 be prepared to 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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>sequence</VAR
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> is not a <A HREF="26_1_Glossary.html#proper_sequence"
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><EM CLASS="term"
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>proper sequence</EM
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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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>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_copy-list.html" CLASS="funref"
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><B
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>copy-list</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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>From a functional standpoint,</P
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><PRE CLASS="screen"
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>(copy-seq x) <SPAN CLASS="cmsy"
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><SPAN STYLE="font-size:16px;vertical-align:-2px"
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>≡</SPAN
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></SPAN
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> (subseq x 0)</PRE
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><P CLASS="j"
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>However, the programmer intent is typically very different in these two cases.</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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><A HREF="t_sequence.html" CLASS="prev"
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>Conversion to HTML copyright 2023 by Gilbert Baumann</DIV
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