Interactive mode is the simplest way to use MATLAB. In this mode,
the user types commands at the MATLAB prompt (>>) and gets immediate
results. MATLAB keeps track of the list of variables which have been
created, their type, and value, and the special variable 'ans'
which is always set to the result of the most recent operation.
The history of commands which have been issued to the interpreter
is available via the up arrow key and in the Command History window to allow the user to
easily access recently-called functions or variable assignments.
>> disp 'Hello World';
In this example, we make use of the built-in
MATLAB function 'disp'. 'disp' takes a string (in MATLAB
a string is any group of characters between single quotes) and
prints it to the screen (interpreter window). Other slightly
more advanced functions are available for printing to the screen
(sprintf) and to a file (fprintf). Their syntax is similar to
the C functions with the same names. Finally, the semicolon character
is used to suppress output printing in MATLAB. MATLAB
normally echos the result of any function call back to the
interpreter window, but it will not do this if you have a
semicolon following the command.