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From: Ben Williams on 2 Jun 2010 11:08
Hello,

I woudl like to know how to use the element values within an array as the index values of another array:

For example:

address = [1,4,22,34,35,36,37,48]

Each of the the element values in the above array correspond to a cell address where the data satisfies a given condition.

e.g. data{1},data{4},data{22},data{34}... etc all satisify a given condition.

What I would like to be able to do is obtain an average of data{1}, data{4}, data{22}... etc but I would like to do it in such a way that I don't have to manually type in the address, instead I can simply have a formula that automatically retrives all the data{j} for all the elements j in the address array.

Any ideas?

Thanks,

Ben
From: Luca Zanotti Fragonara on 2 Jun 2010 11:18
"Ben Williams" <benjamin.williams(a)remove.this.plymouth.ac.uk> wrote in message <hu5s4k$ali$1(a)fred.mathworks.com>...
> Hello,
>
> I woudl like to know how to use the element values within an array as the index values of another array:
>
> For example:
>
> address = [1,4,22,34,35,36,37,48]
>
> Each of the the element values in the above array correspond to a cell address where the data satisfies a given condition.
>
> e.g. data{1},data{4},data{22},data{34}... etc all satisify a given condition.
>
> What I would like to be able to do is obtain an average of data{1}, data{4}, data{22}... etc but I would like to do it in such a way that I don't have to manually type in the address, instead I can simply have a formula that automatically retrives all the data{j} for all the elements j in the address array.
>
> Any ideas?
>
> Thanks,
>
> Ben
c=0;
for jj=1:length(adress)
yourdata(jj,:)=data{adress(jj)};
end

In this way you select the particular data one by one, and in the matrix your data you'll have a matrix full of only your usefule data.
From: Ben Williams on 2 Jun 2010 11:43
"Luca Zanotti Fragonara" <Luca_Zanotti(a)libero.it> wrote in message <hu5snc$l2f$1(a)fred.mathworks.com>...
> "Ben Williams" <benjamin.williams(a)remove.this.plymouth.ac.uk> wrote in message <hu5s4k$ali$1(a)fred.mathworks.com>...
> > Hello,
> >
> > I woudl like to know how to use the element values within an array as the index values of another array:
> >
> > For example:
> >
> > address = [1,4,22,34,35,36,37,48]
> >
> > Each of the the element values in the above array correspond to a cell address where the data satisfies a given condition.
> >
> > e.g. data{1},data{4},data{22},data{34}... etc all satisify a given condition.
> >
> > What I would like to be able to do is obtain an average of data{1}, data{4}, data{22}... etc but I would like to do it in such a way that I don't have to manually type in the address, instead I can simply have a formula that automatically retrives all the data{j} for all the elements j in the address array.
> >
> > Any ideas?
> >
> > Thanks,
> >
> > Ben
> c=0;
> for jj=1:length(adress)
> yourdata(jj,:)=data{adress(jj)};
> end
>
> In this way you select the particular data one by one, and in the matrix your data you'll have a matrix full of only your usefule data.

Thanks, much apprecieted. However all I get is the following error message:
??? Error using ==> subsindex
Function 'subsindex' is not defined for values of class 'cell'.

Thanks,

Ben
From: Luca Zanotti Fragonara on 3 Jun 2010 05:11
If you don't say us how is your cell vector, we cannot help you.

Look at this code, this is working:

empty=zeros(1,1000);
data=cell(50,1);
address = [1,4,22,34,35,36,37,48];

%To fill cell vector of numbers:
for ii=1:50
data{ii}=empty;
end

%Select address cell data:
c=0;
for jj=1:length(address)
yourdata(jj,:)=data{address(jj)};
end
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