How to figure out the number of objects in a workspace?

I have taken the workspace function whos and assigned it to variable obj. How do I then find the number of objects in the workspace?

I have:

obj = evalin('base','whos');
%then I go into a loop 
count=0;
while(true)
count=count+1;
something=obj(count).class;
%do something
end

Is there a way to find length or sizof obj.class?

Answer 1

[Sean de Wolski]

a=whos;
nObj = size({a(:).size},2);
clear a; %to keep the same number of objects; also assuming a _wasn't_ a variable before.

Thus instead of calling it 'a', I would probably call it something like:

hjsdkjfdlsw6237

or

['dklsfjldrf' dec2hex(floor(rand*1000000))]

[Stagleton]

That works well, but I in addition to clearing a I think also subtracting 1 is important like Arnaud suggests.

[Sean de Wolski]

That part isn't clear to me:

clear

a = whos;

length({a.size})

ans =

0

I'd think you might want to add one, since now there is a variable (_a_), actually in this case two variables (_a,ans_)

Answer 2

[Arnaud Miege]

How about length(obj)? Note that this will include obj itself, so you may want to subtract 1.

Arnaud

[Stagleton]

hmm, that doesn't work for me.

If I have:

obj=whos;

Then how do I find the number of objects in obj.class?

[Arnaud Miege]

I don't think you need obj.class. length(obj) with give you the number of object in the workspace + obj itself.