isempty

REN
6 Mar 2011
1 Answer
Answer Accepted
8 Views (30 days)

1 vote

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

5 Comments
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Matt Tearle
Matt Tearle on 6 Mar 2011
what version of MATLAB are you using? that works fine for me.
REN
REN on 6 Mar 2011
version R2010
REN
REN on 6 Mar 2011
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
REN on 6 Mar 2011
thanks Matt Tearle
Matt Tearle
Matt Tearle on 6 Mar 2011
OK, never mind then

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 Accepted Answer

Matt Tearle
Matt Tearle on 6 Mar 2011

0 votes

Problem seems to have been resolved (see above comments), but for the record:
isempty(x)
Another possibility would be
~numel(x)

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