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From: Casper.Ptrsn on 6 May 2008 09:38
Perhaps i've missed something but is it possible (at all?) to write a
function which returns this sort of "structure":

dict =

[1] [1x2 double]
[2] [1x2 double]
[3] [ 0]

The example is taken from the Huffman Coding in the help section of
MatLab.
From: Steven Lord on 6 May 2008 09:56

<Casper.Ptrsn(a)gmail.com> wrote in message
news:6b135fa9-c1fa-417f-b75f-348aa3f3cd44(a)a23g2000hsc.googlegroups.com...
> Perhaps i've missed something but is it possible (at all?) to write a
> function which returns this sort of "structure":
>
> dict =
>
> [1] [1x2 double]
> [2] [1x2 double]
> [3] [ 0]
>
> The example is taken from the Huffman Coding in the help section of
> MatLab.

That's a cell array. Some function return cell arrays, particularly if
they're returning lots of pieces of data that need to be "associated" with
one another but don't have names (and as such aren't as well suited for a
struct array.) You can create cell arrays like this:


dict = {1, [1 2]; 2, [3 4]; 3, 0}


or like this:


% Create an empty cell array dict of the correct size
dict = cell(3, 2);
% Note how I'm using curly braces and parentheses in the code below

% Assign the _double array_ 1 to be the _contents of the cell_ in the first
row and first column of dict
dict{1, 1} = 1;

% Assign the _cell array_ containing [1 2] to _become the cell_ in the first
row and second column of dict
dict(1, 2) = {[1 2]}


I'll leave filling in the remaining two rows as an exercise for you to
become familiar with cell indexing and assignment. Study the lines of code
I wrote, paying close attention to the use of curly braces {} and
parentheses ().

Of course, there's more information about cell arrays in the documentation:

http://www.mathworks.com/access/helpdesk/help/techdoc/matlab_prog/f2-67323.html

--
Steve Lord
slord(a)mathworks.com


From: Casper.Ptrsn on 6 May 2008 10:02
> That's a cell array.  Some function return cell arrays, particularly if
> they're returning lots of pieces of data that need to be "associated" with
> one another but don't have names (and as such aren't as well suited for a
> struct array.) You can create cell arrays like this:
>
> dict = {1, [1 2]; 2, [3 4]; 3, 0}
>
> or like this:
>
> % Create an empty cell array dict of the correct size
> dict = cell(3, 2);
> % Note how I'm using curly braces and parentheses in the code below
>
> % Assign the _double array_ 1 to be the _contents of the cell_ in the first
> row and first column of dict
> dict{1, 1} = 1;
>
> % Assign the _cell array_ containing [1 2] to _become the cell_ in the first
> row and second column of dict
> dict(1, 2) = {[1 2]}
>
> I'll leave filling in the remaining two rows as an exercise for you to
> become familiar with cell indexing and assignment.  Study the lines of code
> I wrote, paying close attention to the use of curly braces {} and
> parentheses ().
>
> Of course, there's more information about cell arrays in the documentation:
>
> http://www.mathworks.com/access/helpdesk/help/techdoc/matlab_prog/f2-...
>
> --
> Steve Lord
> sl...(a)mathworks.com

Thanks alot for you help.

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