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docbook-style-dsssl-doc-1.79-16.mga7.noarch.rpm

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NAME="LIST-PUT"
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>list-put</H1
><DIV
CLASS="REFNAMEDIV"
><A
NAME="AEN1665"
></A
><H2
>Name</H2
>list-put&nbsp;--&nbsp;Replace a specific member of a list</DIV
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>Synopsis</H2
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>(list-put vlist ordinal value #!optional (span 1))</PRE
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NAME="AEN1671"
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><H2
>Description</H2
><P
>Replaces the <TT
CLASS="LITERAL"
>ordinal</TT
>th value of <TT
CLASS="LITERAL"
>vlist</TT
> with <TT
CLASS="LITERAL"
>value</TT
>.  If <TT
CLASS="LITERAL"
>span</TT
> &#62; 1,
replaces <TT
CLASS="LITERAL"
>ordinal</TT
> to <TT
CLASS="LITERAL"
>ordinal+span-1</TT
> values starting at <TT
CLASS="LITERAL"
>ordinal</TT
>.</P
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></A
><H2
>Example</H2
><P
><TT
CLASS="LITERAL"
>(list-put (1 2 3 4 5) 2 0 2)</TT
> returns <TT
CLASS="LITERAL"
>(1 0 0 4 5)</TT
>.</P
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><A
NAME="AEN1686"
></A
><H2
>Author</H2
><P
>Norman Walsh, &lt;ndw@nwalsh.com&gt;</P
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><A
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></A
><H2
>Source Code</H2
><PRE
CLASS="PROGRAMLISTING"
>(define (list-put vlist ordinal value #!optional (span 1))
  ;; Replace a specific member of a list
  (let loop ((result vlist) (count span) (k ordinal))
    (if (equal? count 0)
	result
	(let ((head (list-head result (- k 1)))
	      (tail (list-tail result k)))
	  (loop (append head (list value) tail) (- count 1) (+ k 1))))))</PRE
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