This is documentation for Mathematica 7, which was
based on an earlier version of the Wolfram Language.
View current documentation (Version 11.1)

$MessageGroups

$MessageGroups
is the list of rules that gives named message groups used in functions like On and Quiet.
  • The value of $MessageGroups has the form {"name":>{symbol::tag, ...}, ...}.
  • Named groups can also appear on the right-hand side of the definitions.
  • $MessageGroups can be reset. Any string can be used as the name of a message group.
  • Predefined named message groups include:
"Compiler"warnings associated with compiled code
"Graphics"warnings associated with graphics generation
"Obsolete"warnings for obsolete functions and packages
"Packing"notifications associated with packed arrays
"Spelling"spell-checking messages for symbol names
"Symbolics"warnings associated with symbolic computation
Get the list of the existing message groups:
Get the list of the existing message groups:
In[1]:=
Click for copyable input
Out[1]=
Get the list of messages associated with packed arrays:
Define a new group comprised of the exising groups:
Check for unpacking of arrays:
This produces rational numbers and has to unpack:
Using inexact numbers leaves the array packed:
Quiet the compiler warnings that allow the evaluation to proceed:
New in 7