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{SECT 0 {PARA 0 "" 0 "" {TEXT -1 0 "" }}{SECT 0 {PARA 0 "" 0 "" {TEXT 
26 6 "Error:" }{TEXT -1 49 "  attempting to assign to ... which is pro
tected\n" }}{PARA 0 "" 0 "" {TEXT -1 527 "Most of the standard names t
hat Maple uses, in particular the names of functions, are protected.  \+
This makes it impossible to assign a new value to them, and generates \+
the error message above if you attempt to do so.  Without this feature
, you might accidentally use the name of a Maple function as a variabl
e and assign it a value.  Then later when some Maple code tried to cal
l this function, the value you gave it would be used instead of the or
iginal definition, causing an error that might be hard to identify and
 correct." }}{PARA 0 "" 0 "" {TEXT -1 0 "" }}{PARA 0 "" 0 "" {TEXT -1 
25 "To tell whether the name " }{MPLTEXT 0 21 1 "X" }{TEXT -1 27 " is \+
protected, you can use " }}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 19 "t
ype(X, protected);" }}{PARA 11 "" 1 "" {XPPMATH 20 "6#%&falseG" }}}
{PARA 0 "" 0 "" {TEXT -1 18 "This would return " }{MPLTEXT 0 21 4 "tru
e" }{TEXT -1 27 " if the name was protected." }}{PARA 0 "" 0 "" {TEXT 
-1 0 "" }}{PARA 0 "" 0 "" {TEXT -1 37 "You can also protect names usin
g the " }{MPLTEXT 0 21 7 "protect" }{TEXT -1 10 " command: " }}{EXCHG 
{PARA 0 "> " 0 "" {MPLTEXT 1 0 15 "protect('foo');" }}}{EXCHG {PARA 0 
"> " 0 "" {MPLTEXT 1 0 8 "foo:= 3;" }}{PARA 8 "" 1 "" {TEXT -1 55 "Err
or, attempting to assign to `foo` which is protected" }}}{PARA 0 "" 0 
"" {TEXT -1 61 "Note the quotes, to prevent premature evaluation of th
e name " }{MPLTEXT 0 21 3 "foo" }{TEXT -1 1 "." }}{PARA 0 "" 0 "" 
{TEXT -1 0 "" }}{PARA 0 "" 0 "" {TEXT -1 103 "It is possible to remove
 the protection from a name (whether it was protected by you or by Map
le) with " }{MPLTEXT 0 21 9 "unprotect" }{TEXT -1 2 ": " }}{EXCHG 
{PARA 0 "> " 0 "" {MPLTEXT 1 0 17 "unprotect('foo');" }}}{EXCHG {PARA 
0 "> " 0 "" {MPLTEXT 1 0 8 "foo:= 3;" }}{PARA 11 "" 1 "" {XPPMATH 20 "
6#>%$fooG\"\"$" }}}{PARA 0 "" 0 "" {TEXT -1 195 "It is dangerous to do
 this for names protected by Maple: it is often very hard to tell what
 functions Maple may end up calling, even when they appear to be quite
 irrelevant to what you are doing." }}}{SECT 0 {PARA 0 "" 0 "" {TEXT 
26 9 "See also:" }{TEXT -1 1 " " }{HYPERLNK 17 "protect unprotect" 2 "
protect" "" }{TEXT -1 2 ", " }{HYPERLNK 17 "type[protected]" 2 "type,p
rotected" "" }}}{SECT 0 {PARA 0 "" 0 "" {TEXT 26 22 "Maple Advisor Dat
abase" }{TEXT -1 18 "   R. Israel, 1997" }}}{PARA 0 "" 0 "" {TEXT -1 
0 "" }}}{MARK "1 10 1" 1 }{VIEWOPTS 1 1 0 1 1 1803 }