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grouping structures together based on filter

Asked by Heena D on 21 Aug 2013

Hi I have a structure that looks like the below

```a
=
mydata:[135x6]
myid:{1x6}
mydates = [135x1]
```

I would like to separate out data into positive and negative I would go through each column in mydata and filter for positive and negative and match it to the corresponding dates

so that in the end i have 6 structures

so for example

```apos(1)
=
mydata:[120x1]
mydates:[120x1]
myid ={1}
```

is there a clean way to do this rather than using a for loop?

Thanks, HD

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Answer by Walter Roberson on 21 Aug 2013
Edited by Walter Roberson on 21 Aug 2013
```aneg = cell2mat( arrayfun( @(K) struct( 'mydata', a.mydata(a.mydata(:,K) < 0,K), 'mydates', a.mydates(a.mydata(:,K) < 0), 'myid', a.myid(K)), 1:size(a.mydata,2),'Uniform', 0) );
apos = cell2mat( arrayfun( @(K) struct( 'mydata', a.mydata(a.mydata(:,K) > 0,K), 'mydates', a.mydates(a.mydata(:,K) > 0), 'myid', a.myid(K)), 1:size(a.mydata,2),'Uniform', 0) );
```

Question: what if the data is exactly 0?

Heena D on 21 Aug 2013

Thanks for your help but is this syntax correct the 1:size(a.mydata(2),'Uniform', 0)

The 0 will be clubbed in with thepositive

Walter Roberson on 21 Aug 2013

Sorry, I fixed my typo.

If you want 0 to be included with positive, then use >= 0 instead of > 0 for apos

Heena D on 21 Aug 2013

Sorry i figured it out thanks so much for your help!

Answer by Azzi Abdelmalek on 21 Aug 2013
Edited by Azzi Abdelmalek on 21 Aug 2013
```%Example
a.mydata=randi([-10 10],135,6)
a.myid=randi([-10 10],1,6)
a.mydates =randi([-10 10],135,1)
%--------------------------------
c1=a.mydata(:);
c2=a.myid(:);
c3=a.mydates(:);
apos.mydata=c1(c1>=0)
apos.myid=c2(c2>=0)
apos.mydates=c3(c3>=0)
```