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From: YASMIN M. Yacob on 3 Aug 2010 00:12
I have error on the sorting part,I have tried cell but
does no effect . What I want to do is to sort each column from data (i.e sort by the attribute/field) and the labels/class will follow. Hope can help me. Thanx.
e.g from iris dataset; simplified version
SL SW PL PW labels
1.2 2.1 3.1 4.1 1
0.9 2.2 3.2 3.9 2
SL labels
0.9 2
1.2 1
SW labels
2.1 1
2.2 2
and so on.
load data
load labels
[nobs,nvars] = size(data);
A = dataset(data, labels);
for i=1:nvars
B = [A(:,i) A.labels]; %OK
disp(B(1:nobs,1:nvars)); %OK
C= sortrows(B,1);
end
Sample run and error:
5 by 2 dataset with 2 classes: [3 2]
1.5000 1.0000
1.2000 1.0000
1.6000 2.0000
1.3000 2.0000
1.4000 1.0000
??? Reference to non-existent field ‘nvars’.
Error in ==> getvarindices at 61
if maxIndex > a.nvars
Error in ==> dataset.sortrows at 53
vars = getvarindices(a,vars,false);
Error in ==> discretize1aug900 at 9
C= sortrows(B,1);
From: Oleg Komarov on 3 Aug 2010 03:20
"YASMIN M. Yacob" <yasmin160273(a)yahoo.com> wrote in message <i384um$8be$1(a)fred.mathworks.com>...
> I have error on the sorting part,I have tried cell but
> does no effect . What I want to do is to sort each column from data (i.e sort by the attribute/field) and the labels/class will follow. Hope can help me. Thanx.
> e.g from iris dataset; simplified version
> SL SW PL PW labels
> 1.2 2.1 3.1 4.1 1
> 0.9 2.2 3.2 3.9 2
> SL labels
> 0.9 2
> 1.2 1
> SW labels
> 2.1 1
> 2.2 2
> and so on.
> load data
> load labels
> [nobs,nvars] = size(data);
> A = dataset(data, labels);
> for i=1:nvars
> B = [A(:,i) A.labels]; %OK
> disp(B(1:nobs,1:nvars)); %OK
> C= sortrows(B,1);
> end
> Sample run and error:
> 5 by 2 dataset with 2 classes: [3 2]
> 1.5000 1.0000
> 1.2000 1.0000
> 1.6000 2.0000
> 1.3000 2.0000
> 1.4000 1.0000
> ??? Reference to non-existent field &#8216;nvars&#8217;.
> Error in ==> getvarindices at 61
> if maxIndex > a.nvars
> Error in ==> dataset.sortrows at 53
> vars = getvarindices(a,vars,false);
> Error in ==> discretize1aug900 at 9
> C= sortrows(B,1);

Apart from the fact that line:
B = [A(:,i) A.labels]
should be:
B = [A.data(:,i) A.labels]

You're not telling the whole story, I don't get any error.
Post here the result of "whos data" and "whos labels".
Also, do you create C somewhere before?

Oleg
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