Check if all values in cell array are 'on'

I created an array of objects in app designer. They're all images.

images=[app.Image1,app.Image2,.......,app.ImageX];

now I get their visible property

check=get(images,'Visible');

that gives me a cell array of 'on' and 'off' values. I want to check if all the values in the array are 'on'. How do I do that? I tried combining it into a matrix, but got errors.

Answer 1

[DGM]

Consider the example

A = {'on'};
A = repmat(A,[10 1])
% A{2} = 'off' % uncomment to test the response to the existence of an 'off' instance

f = @(x) strcmp(x,'on');
allon = all(cellfun(f,A)) % returns scalar logical

EDIT:

Actually, Image Analyst has a point. The regular string comparison tools would be simpler (about 50x faster too) and don't even need cellfun()

allon = all(strcmp(A,'on'))

I don't know why I chose to use cellfun() for that. I just had it on my mind at the time and ran with it.

[Vojtech Siler]

This works! Thank you very much.

Answer 2

[Image Analyst]

Try this:

>> ca = {'on', 'on', 'on'}

ca =

1×3 cell array

{'on'} {'on'} {'on'}

>> allOn = all(ismember(ca, {'on'}))

allOn =

logical

1

>> ca = {'on', 'on', 'off'}

ca =

1×3 cell array

{'on'} {'on'} {'off'}

>> allOn = all(ismember(ca, {'on'}))

allOn =

logical

0

[Vojtech Siler]

This is giving me this error:

Error using cell/ismember (line 34)

Input A of class cell and input B of class cell must be cell arrays of character vectors, unless one is a character vector.

[Image Analyst]

You changed something. My code works. I don't have 34 lines in my code. I had only 2 lines and they worked. You don't need anonymous functions, strcmp(), cellfun(), etc. All you need is the single line of code I gave you that calls ismember().

[Vojtech Siler]

I inserted this code into my code and changed the name of the array to what I had.

Answer 3

[Steven Lord]

One easy way to do this is to use a string.

A = {'on', 'on', 'on'};
all(A == "on")

ans = logical
   1

[Vojtech Siler]

I think I remember trying that, because I found a similar thing as an answer to a similar problem, but I think it threw errors. I'll try this specifically tomorrow, though, and see if it works. Thanks for the answer!

[DGM]

It depends what version you have. This usage with the double quoted string needs R2016b to work (IIRC). At least it doesn't work for me in R2015b.