How to check if all the data in the cell array are the same?

Question

niniki 2022-3-21

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评论： Jan 2022-3-21

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There is a variable called 'data'

in a cell array of 1x10

{100} {100} {100} {100} {100} {100} {100} {100} {100} {100} 100 has the same value.

How can I return these 10 data to True or False?

isequal(data(1),data(2),data(3),data(4),data(5),data(6),data(7),data(8),data(9),data(10))

Instead of writing down all the elements like this, I want to make sure that all the data in th

e cell array has the same value even if the size of the cell array changes.

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Answer 1

Stephen23 2022-3-21

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编辑：Stephen23 2022-3-21

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The simple and very efficient MATLAB approach is to use a comma-separated list:

https://www.mathworks.com/help/matlab/matlab_prog/comma-separated-lists.html

https://www.mathworks.com/matlabcentral/answers/1656435-tutorial-comma-separated-lists-and-how-to-use-them

Avoid approaches which join the data together (e.g. CELL2MAT) or that change data type (e.g. to STRING): they are inefficient, fragile, and will fail for arrays of incompatible sizes, types, or due to loss of information when converting type.

C = repmat({10},1,9)
C = 1×9 cell array
    {[10]}    {[10]}    {[10]}    {[10]}    {[10]}    {[10]}    {[10]}    {[10]}    {[10]}
X = isequal(C{:})
X = logical
   1
C{1} = 10+eps(10)
C = 1×9 cell array
    {[10.0000]}    {[10]}    {[10]}    {[10]}    {[10]}    {[10]}    {[10]}    {[10]}    {[10]}
X = isequal(C{:})
X = logical
   0

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Answer 2

Chunru 2022-3-21

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c = {100, 100, 100, 200}    % cell array
c = 1×4 cell array
    {[100]}    {[100]}    {[100]}    {[200]}
cm = cell2mat(c);
same = all(cm == cm(1))
same = logical
   0

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Answer 3

Arif Hoq 2022-3-21

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if you want to find every index for true or false

A={100};
B=repmat(A,1,10);
[Lia Locb]=ismember(string(B),string({100}))
Lia = 1×10 logical array
   1   1   1   1   1   1   1   1   1   1
Locb = 1×10
     1     1     1     1     1     1     1     1     1     1