checking if field values in a single struct are identical

Hello,

I have a struct (S) with 13 fields. Each field has a 'density' column. I want to do an if statement which checks if all the values in the density columns are the same for each field (all 13 of them) i.e. density vals in field 1 = density vals in field 2 etc

if...(need help with this line)

disp('same altitude')

else

disp('different heights')

end

thank you

[Jan]

What does this mean: "Each field has a 'density' column." Do the fields contain tables? Or is "density" the name of a subfield containing a clumn vector?

Prefer to post some Matlab code, which creates some small example data.

Answer 1

[Jan]

Depending on how the inputs look exactly, maybe:

FieldC = struct2cell(S);
Eq = true;
for k = 2:numel(FieldC)
    if ~isequal(FieldC{k}.density, FieldC{1}.density)
        Eq = false;
        break;
    end
end

There are shorter methods, but please explain at first exactly, what the inputs are.

[Davindra Usov]

Thank you so much. Sorry I forgot to mention that each of the fields in the struct are a table and each table contains a 'density' column. I want to check if the density values in field 1 = density values in field 2....field n.

[Jan]

I assume, the shown code works for table objects also.

[Davindra Usov]

yes, it does! many thanks

Answer 2

[Walter Roberson]

density_cell = structfun(@(C) {C.density}, YourStruct);
EQ = isequal(density_cell{:});

No explicit loop needed (but structfun is arguably a hidden loop.)