how to use find to cell cell indexing

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RuiQi
RuiQi on 10 Dec 2016
Edited: RuiQi on 10 Dec 2016
why does this not work ?
find(grnd_truth_cell{:,1} == 6)
I want to find all of grnd_truth_cell whose 1st column at every row == 6 but matlab tell me Error using == Too many input arguments.
  2 Comments
RuiQi
RuiQi on 10 Dec 2016
These are the last few numbers. It goes from 0 to 7480
ans =
7480
ans =
7480
ans =
7480
ans =
7480

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Accepted Answer

dpb
dpb on 10 Dec 2016
Because as your command line shows,
grnd_truth_cell{:,1}
is a comma-separated list. Enclose it in the [] to make an array that find can operate over--
find([grnd_truth_cell{:,1}]==6)
  1 Comment
RuiQi
RuiQi on 10 Dec 2016
thank you and imageanalyst, i learnt how to handle 'comma-separated lists' today using []

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More Answers (1)

Image Analyst
Image Analyst on 10 Dec 2016
Edited: Image Analyst on 10 Dec 2016
Maybe you can assign it to a column vector first
col1 = grnd_truth_cell{:,1};
whos col1
rowsThatEqual6 = find(col1 == 6); % Braces.
How does that work? Maybe you need to use cell2mat():
col1 = cell2mat(grnd_truth_cell(:, 1)); % Parentheses
If that doesn't work, attach grnd_truth_cell in a .mat file so I can try some things.
save('grnd_truth_cell.mat', 'grnd_truth_cell');
And please read the FAQ on cell arrays: http://matlab.wikia.com/wiki/FAQ#What_is_a_cell_array.3F

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