isempty

REN
2011 3 6
1 个回答
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1 个投票

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 个评论
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Matt Tearle
Matt Tearle 2011-3-6
what version of MATLAB are you using? that works fine for me.
REN
REN 2011-3-6
version R2010
REN
REN 2011-3-6
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 2011-3-6
thanks Matt Tearle
Matt Tearle
Matt Tearle 2011-3-6
OK, never mind then

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 采纳的回答

Matt Tearle
Matt Tearle 2011-3-6

0 个投票

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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