AT execute a command at given time
This command is in a way similar to the AT Linux/Unix command.
T = AT(DELAY, COMMAND) executes the command after the given delay, in seconds.
The DELAY can be a single number (in seconds), a date vector (6
values from e.g. datevec and clock), a string such as '07-Apr-2008 23:00:00'.
The COMMAND can be (see 'timer' documentation):
'code' a single string (matlab code),
@code(src,evnt, ...) a function handle with arguments source(timer),
event type, and optional arguments.

Example: at(10, 'disp hello')