# Find in a cell array?

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Hello all,

Suppose a cell array 10x1 consisted of random numbers from 1 to 5. How can I find the locations for number 5?

All the best,

MhD

##### 3 Comments

Elias Berra
on 17 Nov 2015

Marwan Malaeb
on 20 May 2022

call this array for example X

type k=find(X==5)

it will return for you the number of the cell that has the value of 5.

### Accepted Answer

Jan
on 7 Aug 2013

Edited: Jan
on 7 Aug 2013

C = {1,5,3,4,2,3,4,5,2,1};

index = find([C{:}] == 5);

Here [C{:}] is a faster inlined version of cell2mat.

Alternative:

index = cellfun(@(x) x==5, C, 'UniformOutput', 1);

Or the long and most likely faster form:

index = false(1, numel(C))

for k = 1:numel(C)

index(k) = (C{k} == 5);

end

[EDITED] If you are talking of a cell string, this is much faster:

D = {'1' '5' '3' '4' '2' '3' '4' '5' '2' '1'};

index = find(strcmp(D, '5'));

##### 5 Comments

Jan
on 8 Aug 2013

This looks strange. When eheader is numerical, converting it elementwise inside a cellfun call to a string and afterwards by char to a char matrix is cruel. Then assuming a certain number of spaces around the value is fragile, because the width depends on the values. What about this (I cannot open the posted MAT file, better post code in the forum which creates the example data):

x = find([eheader{:}] == -88)

STRCMP works much faster with cell strings, so at least do not let CHAR() create a CHAR-matrix.

Kylie Hansen
on 16 Aug 2017

### More Answers (2)

Bill Tubbs
on 15 Feb 2022

Just in case someone comes here looking to do this with a cell array of chars as I was, it's quite easy this way:

my_cell_array = {'a', 'b', 'c'};

i = find(strcmp(my_cell_array, 'b'));

assert(i == 2)

##### 1 Comment

Caroline
on 7 Aug 2013

Edited: Azzi Abdelmalek
on 7 Aug 2013

cellarray_new = zeros; %initializing the array

ind = 1; %indices for new array

for j = 1:10

if (cellarray(j) == 5)

cellarray_new(ind) = j;

ind = ind + 1;

end

end

the array cellarray_new will contain all the indices of the original cell array that contain the number 5

##### 3 Comments

Filza Ashraf
on 22 May 2014

how can i find a pixel intensity if cell contains an image or image is stored in cell???

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