Is {} used as index array in class?

5 visualizaciones (últimos 30 días)
Thang Nguyen
Thang Nguyen el 16 de En. de 2013
Hi, While I am studying Matlab object oriented I found this example and I want to confirm it.
I have a constructor:
function obj = DocPortfolio(name,varargin)
if nargin > 0
obj.name = name;
for k = 1:length(varargin)
obj.indAssets{k} = varargin(k);
assetValue = obj.indAssets{k}{1}.currentValue;
obj.totalValue = obj.totalValue + assetValue;
end
end
end
indAssets is an array property. Is it true that obj.indAssets{k} is a way to index into this array? Cause I have never use {} to index array before. And what is obj.indAssets{k}{1} in next line?
Thanks!

Respuesta aceptada

Cedric
Cedric el 16 de En. de 2013
Editada: Cedric el 16 de En. de 2013
Your question is not related to OOP. Look at the following:
>> c = {5, {'Hello', 'World'}, struct( 'a', 8, 'b', 9 )} ;
c = [5] {1x2 cell} [1x1 struct]
Here, c is a cell array (an array of cells).
>> class( c )
ans = cell
You can index blocks of this cell array using ()-type indexing.
>> c(1:2)
ans = [5] {1x2 cell}
>> c(1)
ans = [5]
The latter is the first element of the cell array c, which is a cell in itself.
>> class( c(1) )
ans = cell
For extracting the content of this cell, you have to use {}-type indexing.
>> c{1}
ans = 5
This time it (the content) is the double 5.
>> class( c{1} )
ans = double
Now indexing can be "nested"; c{2} is the content of cell #2 of the cell array c. This content is a cell array in itself, that you can again index with both () and {} whether you want cells or their content.
>> c{2}
ans = 'Hello' 'World'
>> class( c{2}(1) )
ans = cell
>> class( c{2}{1} )
ans = char
Or when the content is a struct..
>> class( c{3} )
ans = struct
>> c{3}.a
ans = 8
Hope it helps,
Cedric
  2 comentarios
Thang Nguyen
Thang Nguyen el 16 de En. de 2013
Thanks Cedric for spending time to answer my question. I highly appreciate your help!
Cedric
Cedric el 16 de En. de 2013
You are most welcome! Please accept the Answer if it answers your question.

Iniciar sesión para comentar.

Más respuestas (0)

Categorías

Más información sobre Matrix Indexing en Help Center y File Exchange.

Productos

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by