Index Non-Empty Cells in Cell Array
显示 更早的评论
Hi,
I have the following cell array
TEST = [1] [] [] [] []
I want to get the index position of the non-empty cell. I know I can do this using a loop, but is there any single command (like "find") that will do this?
Thank you!
JF
采纳的回答
Honglei Chen
2012-6-28
编辑：Honglei Chen
2012-6-28
x = {1,[],[],[]};
find(~cellfun(@isempty,x))
6 个评论
John F
2012-6-28
Jan
2012-6-28
And as usual I mention that "cellfun('isempty', x)" is faster. Although the documentation claims, that this style is kept for backward compatibility only, the string commands are built into the Mex, while the function handle commands require a return to the Matlab interpreter for each cell element.
Honglei Chen
2012-6-28
Never thought about that but it surely is good to know, thanks Jan.
Christos Oreinos
2016-10-6
The change in performance is significant for very large cells:
>> x=cell(10000000, 1);
>> x(1980) = {1};
>> tic; find(~cellfun(@isempty, x)); toc
Elapsed time is 5.852150 seconds.
>>
>> tic; find(~cellfun('isempty', x)); toc
Elapsed time is 0.041747 seconds.
Md. Mubarak Hossain
2017-5-16
a={1 [] [];2 [] 4;5 6 []} find(~cellfun(@isempty,a)) ans =
1
2
3
6
8
Here I'm getting answer in column wise. But How to get row wise answer.
That's means I wanna get
ans=1 4 6 7 8 .
How to get it?
Serge Kogan
2020-10-21
Md. Mubarak Hossain, You can get it by transposing the cell array a :
a={1 [] [];2 [] 4;5 6 []};
find(~cellfun(@isempty,a'))
更多回答（1 个）
Attila
2017-5-16
1 个投票
Dear Mubarak,
This will work : find(~cellfun(@isempty,a'));
类别
在 帮助中心 和 File Exchange 中查找有关 Matrix Indexing 的更多信息
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!
Translated by 
