Section: Inspection Functions
who
function indicates the size and type of the variable as well as 
if it is a global or persistent.  There are two formats for the 
function call.  The first is the explicit form, in which a list
of variables are provided:
who a1 a2 ...
In the second form
who
the who function lists all variables defined in the current 
context (as well as global and persistent variables). Note that
there are two alternate forms for calling the who function:
who 'a1' 'a2' ...
and
  who('a1','a2',...)
who, which lists all of the variables defined.
--> c = [1,2,3];
--> f = 'hello';
--> p = randn(1,256);
--> who
  Variable Name       Type   Flags             Size
              c    double                    [1 3]
              f      char                    [1 5]
              p    double                    [1 256]
In the second case, we examine only a specific variable:
--> who c
  Variable Name       Type   Flags             Size
              c    double                    [1 3]
--> who('c')
  Variable Name       Type   Flags             Size
              c    double                    [1 3]