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330 lines
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<!DOCTYPE HTML>
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>funcall | 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="5_Data_and_Control_Flow.html"
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>5. Data and Control Flow</A
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>→ <A HREF="5_3_Data_and_Control_Flow_Dictionary.html"
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>5.3 Data and Control Flow Dictionary</A
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> <SPAN CLASS="breadcrumb-item"
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>→ <A HREF="f_funcall.html"
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>funcall</A
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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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><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="funcall"
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></SPAN
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><B
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>funcall</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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>funcall</B
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> <SPAN CLASS="cmssi"
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>function</SPAN
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> <SPAN CLASS="cmtt"
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>&rest</SPAN
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> <SPAN CLASS="cmssi"
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>args</SPAN
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> <SPAN CLASS="arrow"
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>→</SPAN
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> {<VAR CLASS="param"
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>result</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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>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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>function</VAR
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> — a <A HREF="26_1_Glossary.html#function_designator"
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><EM CLASS="term"
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>function designator</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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>args</VAR
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> — <A HREF="26_1_Glossary.html#argument"
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><EM CLASS="term"
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>arguments</EM
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></A
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> to the <VAR CLASS="param"
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>function</VAR
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>. </P
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><P CLASS="j"
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><VAR CLASS="param"
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>results</VAR
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> — the <A HREF="26_1_Glossary.html#value"
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><EM CLASS="term"
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>values</EM
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></A
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> returned by the <VAR CLASS="param"
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>function</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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><A HREF="f_funcall.html" CLASS="funref"
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><B
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>funcall</B
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></A
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> applies <VAR CLASS="param"
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>function</VAR
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> to <VAR CLASS="param"
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>args</VAR
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>. If <VAR CLASS="param"
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>function</VAR
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> is a <A HREF="26_1_Glossary.html#symbol"
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><EM CLASS="term"
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>symbol</EM
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></A
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>, it is coerced to a <A HREF="26_1_Glossary.html#function"
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><EM CLASS="term"
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>function</EM
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></A
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> as if by finding its <A HREF="26_1_Glossary.html#functional_value"
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><EM CLASS="term"
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>functional value</EM
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></A
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> in the <A HREF="26_1_Glossary.html#global_environment"
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><EM CLASS="term"
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>global environment</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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> (funcall #'+ 1 2 3) <SPAN CLASS="cmsy"
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><SPAN CLASS="arrow"
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>→</SPAN
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></SPAN
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> 6
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(funcall 'car '(1 2 3)) <SPAN CLASS="cmsy"
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><SPAN CLASS="arrow"
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>→</SPAN
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></SPAN
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> 1
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(funcall 'position 1 '(1 2 3 2 1) :start 1) <SPAN CLASS="cmsy"
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><SPAN CLASS="arrow"
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>→</SPAN
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></SPAN
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> 4
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(cons 1 2) <SPAN CLASS="cmsy"
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><SPAN CLASS="arrow"
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>→</SPAN
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></SPAN
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> (1 . 2)
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(flet ((cons (x y) `(kons ,x ,y)))
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(let ((cons (symbol-function '+)))
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(funcall #'cons
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(funcall 'cons 1 2)
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(funcall cons 1 2))))
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<SPAN CLASS="cmsy"
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><SPAN CLASS="arrow"
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>→</SPAN
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></SPAN
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> (KONS (1 . 2) 3)</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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>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_undefined-function.html" CLASS="typeref"
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><B
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>undefined-function</B
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></A
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> should be signaled if <VAR CLASS="param"
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>function</VAR
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> is a <A HREF="26_1_Glossary.html#symbol"
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><EM CLASS="term"
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>symbol</EM
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></A
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> that does not have a global definition as a <A HREF="26_1_Glossary.html#function"
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><EM CLASS="term"
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>function</EM
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></A
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> or that has a global definition as a <A HREF="26_1_Glossary.html#macro"
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><EM CLASS="term"
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>macro</EM
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></A
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> or a <A HREF="26_1_Glossary.html#special_operator"
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><EM CLASS="term"
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>special operator</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_apply.html" CLASS="funref"
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><B
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>apply</B
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></A
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>, <A HREF="f_function.html" CLASS="specref"
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><B
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>function</B
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></A
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>, <A HREF="3_1_Evaluation.html#sec_3_1" CLASS="secref"
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><SPAN CLASS="cmr"
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>Section</SPAN
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> <SPAN CLASS="cmr"
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>3.1</SPAN
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> <SPAN CLASS="cmr"
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>(Evaluation)</SPAN
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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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><PRE CLASS="screen"
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>(funcall <VAR CLASS="param"
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>function</VAR
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> <VAR CLASS="param"
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>arg1</VAR
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> <VAR CLASS="param"
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>arg2</VAR
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> ...)
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<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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> (apply <VAR CLASS="param"
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>function</VAR
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> <VAR CLASS="param"
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>arg1</VAR
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> <VAR CLASS="param"
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>arg2</VAR
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> ... nil)
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<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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> (apply <VAR CLASS="param"
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>function</VAR
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> (list <VAR CLASS="param"
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>arg1</VAR
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> <VAR CLASS="param"
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>arg2</VAR
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> ...))</PRE
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><P CLASS="j"
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>The difference between <A HREF="f_funcall.html" CLASS="funref"
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><B
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>funcall</B
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></A
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> and an ordinary function call is that in the former case the <VAR CLASS="param"
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>function</VAR
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> is obtained by ordinary <A HREF="26_1_Glossary.html#evaluation"
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><EM CLASS="term"
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>evaluation</EM
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></A
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> of a <A HREF="26_1_Glossary.html#form"
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><EM CLASS="term"
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>form</EM
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></A
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>, and in the latter case it is obtained by the special interpretation of the function position that normally occurs.</P
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></DD
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></DL
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></DIV
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>Conversion to HTML copyright 2023 by Gilbert Baumann</DIV
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