keyboard
keyboard invokes the keyboard as if it were a script M-file. When placed in an M-file, keyboard stops execution of the file and gives control to the keyboard. The special status is indicated by a K appearing before the prompt. You can examine or change variables; all MATLAB commands are valid.
Executing the command return terminates the keyboard mode. Type the six letters
return
then press the Return key.
dbstop,debug,input,quit
(c) Copyright 1994 by The MathWorks, Inc.