WHOS Describe Currently Defined Variables With Memory Usage

Section: Inspection Functions

Usage

Reports information on either all variables in the current context or on a specified set of variables. For each variable, the 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: 
  whos a1 a2 ...

In the second form 

  whos

the whos 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 whos function: 

  whos 'a1' 'a2' ...

and 

  whos('a1','a2',...)