I have variables in MATLAB, I've checked their class using class() but I also want to know the size that they take in the memory. More accurately, I know that they are of double type, and I want to make sure that they are 32-bit double and not 64-bit.
The version of the MATLAB I'm using is R2009b.
You can use whos to obtain an array of structures that describe, amongst other things, the size in bytes of each variable.
Note that a double is, by definition, 64-bit!