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{SECT 0 {SECT 0 {PARA 0 "" 0 "" {TEXT 26 7 "Advice:" }{TEXT -1 46 " Lo
cal procedures don't access local variables" }}{PARA 0 "" 0 "" {TEXT 
-1 0 "" }}{PARA 0 "" 0 "" {TEXT -1 57 "A procedure can define other pr
ocedures inside it (using " }{MPLTEXT 0 21 4 "proc" }{TEXT -1 4 " or \+
" }{MPLTEXT 0 21 2 "->" }{TEXT -1 208 "), but these are quite differen
t from local procedures in most programming languages.  In particular,
 they do not have access to the local variables and formal parameters \+
of the first procedure.  For example:" }}{EXCHG {PARA 0 "> " 0 "" 
{MPLTEXT 1 0 95 " f:= proc(x) local y, g;\n         y:= a;\n         g
:= t -> x + y + t;\n         g(b);\n      end;" }}}{EXCHG {PARA 0 "> \+
" 0 "" {MPLTEXT 1 0 5 "f(c);" }}{PARA 11 "" 1 "" {XPPMATH 20 "6#,(%\"x
G\"\"\"%\"yGF%%\"bGF%" }}}{PARA 0 "" 0 "" {TEXT -1 0 "" }}{PARA 0 "" 
0 "" {TEXT -1 4 "The " }{MPLTEXT 0 21 1 "x" }{TEXT -1 5 " and " }
{MPLTEXT 0 21 1 "y" }{TEXT -1 23 " in the definition of  " }{MPLTEXT 
0 21 1 "g" }{TEXT -1 26 " are the global variables " }{MPLTEXT 0 21 1 
"x" }{MPLTEXT 1 0 0 "" }{TEXT -1 5 " and " }{MPLTEXT 0 21 1 "y" }
{TEXT -1 27 ", not the formal parameter " }{MPLTEXT 0 21 0 "" }{TEXT 
-1 1 " " }{MPLTEXT 0 21 1 "x" }{TEXT -1 19 " or local variable " }
{MPLTEXT 0 21 1 "y" }{TEXT -1 5 " of  " }{MPLTEXT 0 21 1 "f" }{TEXT 
-1 1 "." }}{PARA 0 "" 0 "" {TEXT -1 0 "" }}{PARA 0 "" 0 "" {TEXT -1 
22 "You can, however, use " }{MPLTEXT 0 21 4 "subs" }{TEXT -1 89 " to \+
define a procedure that uses the values of the formal parameters and l
ocal variables:" }}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 116 "f:= proc
(x) local y, g;\n         y:= a;\n         g:= subs(_X=x, _Y=y, (t -> \+
_X + _Y + t));\n         g(b);\n      end;" }}}{EXCHG {PARA 0 "> " 0 "
" {MPLTEXT 1 0 5 "f(c);" }}{PARA 11 "" 1 "" {XPPMATH 20 "6#,(%\"cG\"\"
\"%\"aGF%%\"bGF%" }}}{PARA 0 "" 0 "" {TEXT -1 75 "\nThis page does not
 apply to Release 5, in which Maple has lexical scoping." }}}{SECT 0 
{PARA 0 "" 0 "" {TEXT 26 9 "See also:" }{TEXT -1 1 " " }{HYPERLNK 17 "
procedures" 2 "procedures" "" }}}{SECT 0 {PARA 0 "" 0 "" {TEXT 26 22 "
Maple Advisor Database" }{TEXT 256 18 "   R. Israel, 1997" }}}}{MARK "
0 0 1" 46 }{VIEWOPTS 1 1 0 1 1 1803 }