Quiet¶

Evaluates an expression while suppressing its messages.

$ wo 'Quiet[1/0]'
ComplexInfinity

A quieted message is left out of $MessageList, which otherwise lists every message raised so far in the calculation.

$ wo 'Quiet[1/0]; $MessageList'
{}

The same message prints at most three times per calculation, after which a General::stop notice replaces it. Later ones are not merely silent — they are not recorded either, so $MessageList never grows past those four entries however long the loop runs.

$ wo 'Do[1/0, {50}]; Length[$MessageList]'
* (glob*)
4

Quiet does not exempt a message from that count; it only stops it printing.

$ wo 'Quiet[Do[1/0, {50}]; Length[$MessageList]]'
4