`lasterr`

Returns the message of the most recent error.

Syntax

msg = lasterr

Returns the last error message.

[msg, id] = lasterr

Also returns its identifier.

lasterr(msg, id)

Sets the stored message and identifier.

Description

Every error raised in the session, even one caught by try, updates the stored message. lasterr reads it back, which was the older way to inspect an error after an empty catch. Prefer catch err and use err.message and err.identifier, which belong to one specific error.

Input arguments

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

Output arguments

msg: Text of the last error; empty if none occurred.
id: Identifier of the last error.

Example

Reading the last error

try
    error('Demo:fail', 'boom %d', 2);
catch
end
[msg, id] = lasterr

Output

msg = 'boom 2'
id = 'Demo:fail'

lasterr