Thread Subject: find to search cell array

Hi,

I have a cell array made up of empty cells and 1s. I used the following to get the locations of the 1s:

s2=find(s1);

but got the following error,

??? Undefined function or method 'find' for input arguments of
type 'cell'.

Thanks ! :)

as far as I concern,the input in find function is not allowed to be in cell type

"A Ram" <shal.hat@gmail.com> wrote in message <hdmc55$h7g$1@fred.mathworks.com>...
> Hi,
>
> I have a cell array made up of empty cells and 1s. I used the following to get the locations of the 1s:
>
> s2=find(s1);
>
> but got the following error,
>
> ??? Undefined function or method 'find' for input arguments of
> type 'cell'.
>
> Thanks ! :)
help cellfun
IDX = find(cellfun(@(x) x==1,s1))

Dear A Ram!

> > I have a cell array made up of empty cells and 1s. I used the following to get the locations of the 1s:
> >
> > s2=find(s1);
> > ??? Undefined function or method 'find' for input arguments of
> > type 'cell'.
> >

> help cellfun
> IDX = find(cellfun(@(x) x==1, s1))

Oleg's method fails, doesn't it? I cannot try it (Matlab 6.5...).
The == operator does not work as expected if the cell element is empty. ISEQUAL does:
  IDX = find(cellfun(@(x) isequal(x, 1), s1))

To find all not-empty cell elements:
  IDX = find(~cellfun('isempty', s1));

Good luck, Jan

"Jan Simon" <matlab.THIS_YEAR@nMINUSsimon.de> wrote in message <hdp5em$1md$1@fred.mathworks.com>...

> The == operator does not work as expected if the cell element is empty. ISEQUAL does:
> IDX = find(cellfun(@(x) isequal(x, 1), s1))
>
> To find all not-empty cell elements:
> IDX = find(~cellfun('isempty', s1));


Just as a footnote, cellfun has been observed to run faster for 'isempty' and other select functions (mentioned in "help cellfun") than for anonymous functions like
(@(x) isequal(x, 1)

> Oleg's method fails, doesn't it? I cannot try it (Matlab 6.5...).
> The == operator does not work as expected if the cell element is empty. ISEQUAL does:
> IDX = find(cellfun(@(x) isequal(x, 1), s1))
>
> To find all not-empty cell elements:
> IDX = find(~cellfun('isempty', s1));
>
> Good luck, Jan

 Jan is right. Sry for the wrong tip.