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{SECT 0 {SECT 0 {PARA 0 "" 0 "" {TEXT 26 8 "Warning:" }{TEXT -1 51 "  \+
... is implicitly declared local to procedure ..." }}{PARA 0 "" 0 "" 
{TEXT -1 281 "Maple provides this warning when you define a function u
sing a variable which you do not declare as local or global, but which
 Maple assumes is local.  Maple makes this assumption for any undeclar
ed variable that is assigned a value in the procedure, or is the index
 variable in a " }{MPLTEXT 0 21 3 "for" }{TEXT -1 94 " loop.  Any othe
r undeclared variable is assumed to be global, and no warning is given
 for it." }}{PARA 0 "" 0 "" {TEXT -1 0 "" }}{PARA 0 "" 0 "" {TEXT -1 
134 "If you have no objection to the variable being local, you can ign
ore the warning.  It is generally a good idea for index variables in \+
" }{MPLTEXT 0 21 3 "for" }{TEXT -1 461 " loops to be local, because yo
u usually don't need or want to refer to these variables outside the l
oop.  However, in some cases you do want the variable to be global.  I
n particular, a common situation would be where you use a procedure to
 set the values of some global variables.  Or you may want to have acc
ess to the values of some variables from another procedure which this \+
one calls, without using a formal parameter.  In these cases, you shou
ld use the " }{MPLTEXT 0 21 6 "global" }{TEXT -1 42 " declaration to m
ake the variables global." }}}{SECT 0 {PARA 3 "" 0 "" {TEXT 26 9 "Exam
ples:" }}{PARA 0 "" 0 "" {TEXT -1 13 "The variable " }{MPLTEXT 0 21 1 
"y" }{TEXT -1 84 " is assigned a value in the following procedure, and
 therefore is taken to be local." }}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 
1 0 26 "foo:= proc(x) y:= x+1 end;" }}{PARA 7 "" 1 "" {TEXT -1 61 "War
ning, `y` is implicitly declared local to procedure `foo`\n" }}{PARA 
11 "" 1 "" {XPPMATH 20 "6#>%$fooGR6#%\"xG6#%\"yG6\"F*>8$,&9$\"\"\"F/F/
F*F*F*" }}}{PARA 0 "" 0 "" {TEXT -1 70 "Since it is local, the procedu
re has no effect on the global variable " }{MPLTEXT 0 21 1 "y" }{TEXT 
-1 1 ":" }}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 10 "foo(3): y;" }}
{PARA 11 "" 1 "" {XPPMATH 20 "6#%\"yG" }}}{PARA 0 "" 0 "" {TEXT -1 52 
"If the procedure is to be used to assign a value to " }{MPLTEXT 0 21 
1 "y" }{TEXT -1 42 ", that variable should be declared global." }}
{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 36 "foo:= proc(x) global y; y:= \+
x+1 end;" }}{PARA 11 "" 1 "" {XPPMATH 20 "6#>%$fooGR6#%\"xG6\"F(F(>%\"
yG,&9$\"\"\"F-F-F(6#F*F(" }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 10 
"foo(3): y;" }}{PARA 11 "" 1 "" {XPPMATH 20 "6#\"\"%" }}}{PARA 0 "" 0 
"" {TEXT -1 50 "In the next example, in order for both procedures " }
{MPLTEXT 0 21 1 "a" }{TEXT -1 5 " and " }{MPLTEXT 0 21 1 "b" }{TEXT 
-1 28 " to have access to variable " }{MPLTEXT 0 21 1 "y" }{TEXT -1 
50 " (without passing that name as a formal parameter)" }{TEXT -1 48 "
, it must be declared global in both procedures." }}{EXCHG {PARA 0 "> \+
" 0 "" {MPLTEXT 1 0 41 "a:= proc(x) global y; y:= 1; b(x); y end;" }}
{PARA 11 "" 1 "" {XPPMATH 20 "6#>%\"aGR6#%\"xG6\"F(F(C%>%\"yG\"\"\"-%
\"bG6#9$F+F(6#F+F(" }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 36 "b:= p
roc(x) global y; y:= y + x end;" }}{PARA 11 "" 1 "" {XPPMATH 20 "6#>%
\"bGR6#%\"xG6\"F(F(>%\"yG,&F*\"\"\"9$F,F(6#F*F(" }}}{EXCHG {PARA 0 "> \+
" 0 "" {MPLTEXT 1 0 5 "a(3);" }}{PARA 11 "" 1 "" {XPPMATH 20 "6#\"\"%
" }}}{PARA 0 "" 0 "" {TEXT -1 20 "Index variable in a " }{MPLTEXT 0 
21 3 "for" }{TEXT -1 6 " loop:" }}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 
0 59 "foo:= proc(x) for j from 1 to x do print(`Hello`,j) od end;" }}
{PARA 7 "" 1 "" {TEXT -1 61 "Warning, `j` is implicitly declared local
 to procedure `foo`\n" }}{PARA 11 "" 1 "" {XPPMATH 20 "6#>%$fooGR6#%\"
xG6#%\"jG6\"F*?(8$\"\"\"F-9$%%trueG-%&printG6$%&HelloGF,F*F*F*" }}}}
{SECT 0 {PARA 0 "" 0 "" {TEXT 26 9 "See also:" }{TEXT -1 1 " " }
{HYPERLNK 17 "procedure" 2 "procedure" "" }{TEXT -1 2 ", " }{TEXT -1 
0 "" }{HYPERLNK 17 "for" 2 "do" "" }}}{SECT 0 {PARA 0 "" 0 "" {TEXT 
26 22 "Maple Advisor Database" }{TEXT -1 18 "   R. Israel, 2000" }}}
{PARA 0 "" 0 "" {TEXT -1 0 "" }}}{MARK "3 0 1" 18 }{VIEWOPTS 1 1 0 1 
1 1803 1 1 1 1 }{PAGENUMBERS 0 1 2 33 1 1 }