Message

Message[symbol::tag]
prints the message unless it has been switched off.

Message[symbol::tag, e1, e2, ...]
prints a message, inserting the values of the as needed.

DetailsDetails

  • Message generates output on the channel $Messages.
  • You can switch off a message using Off[symbol::tag]. You can switch on a message using On[symbol::tag].
  • Between any two successive input lines, Mathematica prints a message with a particular name at most three times. On the last occurrence, it prints the message General::stop.
  • Off[General::stop] makes Mathematica not stop repeating messages.
  • During the evaluation of a particular input line, names of messages associated with that input line are appended to the list $MessageList, wrapped with HoldForm. At the end of the evaluation of the n^(th) input line, the value of $MessageList is assigned to MessageList[n].
  • Message[mname, e1, e2, ...] is printed as StringForm[mess, e1, e2, ...] where mess is the value of the message mname. Entries of the form in the string mess are replaced by the corresponding .
  • Given a message specified as , Message first searches for messages for each of the languages in the list $Language. If it finds none of these, it then searches for the actual message . If it does not find this, it then performs the same search procedure for General::tag. If it still finds no message, it applies any value given for the global variable $NewMessage to symbol and .
  • If you specify a message as , then Message will search only for messages with the particular language lang.

ExamplesExamplesopen allclose all

Basic Examples (2)Basic Examples (2)

Issue a message:

Define a function to issue a message and return unevaluated upon an error:

In[1]:=
Click for copyable input

Define the message:

In[2]:=
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In[3]:=
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Out[3]=
In[4]:=
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Out[4]=
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