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Re: why does a cell look different when it is a field in a struct?
Posted:
Dec 5, 2012 1:49 PM
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"matt dash" wrote in message <k9o3ch$o3f$1@newscl01ah.mathworks.com>...
> "Nasser M. Abbasi" wrote in message <k9ngld$fsc$1@speranza.aioe.org>...
> > Matlab 2012a
> >
> > I am not good with cells. but this is strange:
> >
> > ---------------------
> > clear all;
> > A = {'A' 'a';'B' 'c'};
> > s = struct('data',{A(:,1)'});
> > ------------------------
> >
> > Now I typed:
> >
> > -----------------
> > r1 = {A(:,1)'}
> > r2 = s.data
> > -----------------
> >
> > Isn't the above 2 variable supposed to contain the same thing?
> >
> > But see:
> >
> > ---------------------
> > r1 =
> > {1x2 cell}
> >
> >
> > r2 =
> > 'A' 'B'
> > ---------------------
> >
> > I am confused now. Why are they different?
> >
> > --Nasser
>
> This has something to do with how the struct function handles cell arrays as inputs. It's basically peeling off that cell that you are putting around A(:,1)'. Note that A(:,1)' is already a cell array, so there's normally no need to put {} around it... but the way the struct function works you need the extra { } to tell it that you want to make a scalar structure (instead of distributing each cell of A to a different index of a non-scalar structure).
And just to clarify: they don't just look different, they are different:
r1= {{'A','B'}}
r2 = {'A','B'}
r1{1} = {'A','B'}
r2{1} = 'A'
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