Error, attempting to assign to ... which is protected - Maple Help

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Error,  attempting to assign to ... which is protected

 

Description

Examples

See Also

Description

Most Maple systems names are protected by default. Protection is used to prevent names from being modified by the user.

Names can be protected with the function protect, and protection can be removed with unprotect. It is not recommended that you unprotect Maple protected names.

The calling sequence select(type, {unames(), anames(anything)}, protected) returns the set of protected names in Maple.

Examples

Example 1
To verify that a name is protected, use the type(expr,protected) calling sequence.

typea,protected;

false

(2.1)

Example 2

If the name is protected, the command returns true.

typesin,protected;

true

(2.2)

Example 3

You can protect names using the protect command.

protectmyprotectedname;

myprotectedname2;

Error, attempting to assign to `myprotectedname` which is protected

Note: Use quotes to prevent evaluation of the name myprotectedname.

Example 4

You can remove protection from a name with the unprotect command.

unprotectmyprotectedname;

myprotectedname2;

myprotectedname:=2

(2.3)

See Also

protect, type/protected, unprotect

 


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