Indexing a cell, ignoring empty inputs?

Question

Thomas Koelen 2015-3-24

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/184876-indexing-a-cell-ignoring-empty-inputs

评论： Thomas Koelen 2015-3-24

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

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Answer 1

Titus Edelhofer 2015-3-24

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/184876-indexing-a-cell-ignoring-empty-inputs#answer_172517

编辑：Titus Edelhofer 2015-3-24

在 MATLAB Online 中打开

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'