`lastwarn`

Returns or sets the most recent warning message.

Syntax

msg = lastwarn

Returns the last warning message.

[msg, id] = lastwarn

Also returns its identifier.

lastwarn(msg, id)

Sets the stored message and identifier.

Description

Each warning issued through warning is remembered, even if it was switched off. Code can call lastwarn('') before an operation and read lastwarn afterwards to learn whether the operation warned, without parsing printed output.

Input arguments

msg: Message to store.
id: Identifier to store.

Output arguments

msg: Text of the last warning; empty if none was issued.
id: Identifier of the last warning.

Example

Detecting a warning

lastwarn('');
warning('Demo:low', 'Level is low (%d)', 3);
[msg, id] = lastwarn

Output

msg = 'Level is low (3)'
id = 'Demo:low'
Warning: Level is low (3)

lastwarn