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

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.

Answer 1

[Stephen23]

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

Answer 2

[Chunru]

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

Answer 3

[Arif Hoq]

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

[Jan]

The conversion to a string is an expensive indirection. isequal(A{:}) is faster.