error in 'isempty(x)' when x is in the class of dataset
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Hi,
I have problems using function isempty(x) when x is in the class of dataset. For example,
>> x=randn(100,10); >> xx=dataset(x); >> isempty(xx) ??? Reference to non-existent field 'nobs'.
Error in ==> dataset.isempty at 11 t = (a.nobs == 0) (a.nvars == 0);
I think this is because when I use 'dataset', only certain fields are created, which does not include the field 'nobs'. When isempty.m tries to locate this field, the error occurs. However, I am not sure how to solve this problem. Can anyone help me with this please?
Thanks in advance.
8 个评论
Thomas
2012-7-11
Works fine for me: What version of MATLAB are you using?
x=randn(100,10);
xx=dataset(x);
>> isempty(xx)
ans =
0
Xiu
2012-7-11
Thomas
2012-7-11
I cannot test on R2010a but I can assure you it works from R2010b Sp1 onwards.. What OS are you on? Windows, Linux ,OSX?
Xiu
2012-7-11
Matt Tearle
2012-7-11
I just tried it on 10a and it worked fine. The error seems to indicate that it doesn't recognize the nobs property. But it's using the dataset version of isempty, so it should... Very odd. Something messed up in your installation, perhaps?
Just as a sanity check, try
>> which dataset(x)
and
>> which isempty(xx)
Sean de Wolski
2012-7-11
Not reproducing for me on 12a:
x=randn(100,10);
xx=dataset(x);
isempty(xx)
Xiu
2012-7-11
Sean de Wolski
2012-7-11
编辑：Sean de Wolski
2012-7-11
Excellent!
Xiu, please write your comment as an answer and accept it to mark this question closed!
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