Is {} used as index array in class?
显示 更早的评论
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?
This is the link to the example: http://www.mathworks.com/help/matlab/matlab_oop/a-simple-class-hierarchy.html
Thanks!
采纳的回答
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 个评论
Thang Nguyen
2013-1-16
Cedric
2013-1-16
You are most welcome! Please accept the Answer if it answers your question.
更多回答（0 个）
类别
在 帮助中心 和 File Exchange 中查找有关 Functions 的更多信息
产品
2013-1-16
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!
Translated by 
