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><H1
><A
NAME="DECREMENT-LIST-MEMBERS"
></A
>decrement-list-members</H1
><DIV
CLASS="REFNAMEDIV"
><A
NAME="AEN1696"
></A
><H2
>Name</H2
>decrement-list-members&nbsp;--&nbsp;Decrement each member of a list</DIV
><DIV
CLASS="REFSYNOPSISDIV"
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NAME="AEN1699"
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>Synopsis</H2
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>(decrement-list-members vlist #!optional (decr 1) (floor 0))</PRE
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NAME="AEN1702"
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><H2
>Description</H2
><P
>Decrement all the values of a list by <TT
CLASS="LITERAL"
>decr</TT
>, not to fall below <TT
CLASS="LITERAL"
>floor</TT
>.</P
><P
></P
><DIV
CLASS="VARIABLELIST"
><DL
><DT
><TT
CLASS="LITERAL"
>vlist</TT
></DT
><DD
><P
>The list of values.  All the values of this list should be numeric.</P
></DD
><DT
><TT
CLASS="LITERAL"
>decr</TT
></DT
><DD
><P
>The amount by which each element of the list should be decremented.
The default is 1.</P
></DD
><DT
><TT
CLASS="LITERAL"
>floor</TT
></DT
><DD
><P
>The value below which each member of the list is not allowed to fall.
The default is 0.</P
></DD
></DL
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><DIV
CLASS="REFSECT1"
><A
NAME="AEN1723"
></A
><H2
>Author</H2
><P
>David Carlisle</P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN1726"
></A
><H2
>Source Code</H2
><PRE
CLASS="PROGRAMLISTING"
>(define (decrement-list-members vlist #!optional (decr 1) (floor 0))
  ;; Decrement each member of a list
  (map (lambda (a) 
	 (if (&#60;= a (+ decr floor))
	     floor
	     (- a decr)))
       vlist))</PRE
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