isempty

Hello, could anyone point out how to check a empty set?

I try isempty, seems wrong

 a = [1 3 2]
a =

       1     3     2
K>> b = [1 3 2]

b =

       1     3     2
K>> d  = setdiff(a, b)

d =

     Empty matrix: 1-by-0
K>> isempty(d)

ans =

     Empty matrix: 1-by-0

[Matt Tearle]

what version of MATLAB are you using? that works fine for me.

[REN]

version R2010

[REN]

run again, it works now, not sure what happend just now

a = [1 2]

a =

1 2

>> b=[1 2]

b =

1 2

>> c=setdiff(a, b)

c =

Empty matrix: 1-by-0

>> isempty(c)

ans =

1

[REN]

thanks Matt Tearle

[Matt Tearle]

OK, never mind then

Answer 1

[Matt Tearle]

Problem seems to have been resolved (see above comments), but for the record:

isempty(x)

Another possibility would be

~numel(x)