Indexing a cell, ignoring empty inputs?

I have a cell that looks like this:

    'GS_L'     'OECF'          'DYNAMIC_RANGE'
    'GS_R'     'OECF'          'DYNAMIC_RANGE'
    'GS_U'     'OECF'          'DYNAMIC_RANGE'
    'GS_D'     'OECF'          'DYNAMIC_RANGE'
    'HOR_B'    'UNIFORMITY'    '0'            
    'HOR_W'    'UNIFORMITY'    '0'            
    'HOR_G'    'UNIFORMITY'    '0'            
    'VER_B'    'UNIFORMITY'    '0'            
    'VER_W'    'UNIFORMITY'    '0'            
    'VER_G'    'UNIFORMITY'    '0'

I want to take the first row of the cell that have the word OECF in it.

So I apply this:

     OECFINDEX = strfind(measureables,'OECF');

Which gives:

    []    [1]    []
    []    [1]    []
    []    [1]    []
    []    [1]    []
    []     []    []
    []     []    []
    []     []    []
    []     []    []
    []     []    []
    []     []    []

Now I do this:

    OECFMES = measureables(find([OECFINDEX{:}] == 1)',1);

Which gives me:

    'GS_L'
    'GS_R'
    'GS_U'
    'GS_D'

Now, this seems to be working but when I try it for UNIFORMITY,

     UNIFORMITYMES = measureables(find([UNIFORMITYINDEX{:}] == 1)',1);

It shows:

    'GS_L'
    'GS_R'
    'GS_U'
    'GS_D'
    'HOR_B'
    'HOR_W'

Instead of

    'HOR_B'               
    'HOR_W'               
    'HOR_G'            
    'VER_B'              
    'VER_W'            
    'VER_G'

Does it ignore empty cell inputs? Or what is going on, and is there a way to fix this?

Kind regards,

Thomas Koelen

Answer 1

[Titus Edelhofer]

Hi Thomas,

yes it does. Do you really look for OECF in each string, or do you want to compare to OECF? For your example at least, the following works better:

UNIFORMITYINDEX = strcmp(measureables(:,2), 'UNIFORMITY')
measureables(UNIFORMITYINDEX, 1)
ans = 
  'HOR_B'
  'HOR_W'
  'HOR_G'
  'VER_B'
  'VER_W'
  'VER_G'

Note, that I used strcmp instead of strfind. Don't know if that fit's only this example, though...

If strmatch is indeed the right function, use cellfun:

measureables(~cellfun(@isempty, UNIFORMITYINDEX(:,2)), 1)

Titus

[Thomas Koelen]

Hey Titus,

Thanks for the quick anser! This is exactly what im looking for :D and it's working great!

Could I maybe ask you some other questions in this topic aswell?

Kind regards

[Titus Edelhofer]

Yes, of course. But I would start a new thread.

Titus

[Thomas Koelen]

Ok I did that!

Thanks again.