Check for the existence of a variable inside a structure array

I have a structure array:

data{1} =

         date: 19580508
          lon: 159.3833
          lat: -23.4667
        depth: [12x1 single]
         temp: [12x1 single]
          sal: [12x1 single]
          oxy: [12x1 single]

Some of them have the variable 'oxy', others don't. I am trying to figure out how to check for the existence of 'oxy'.

I tried to use A = existence('data{1}.oxy'), but its results are always 0, even when the variable exists.

Should I use some other function to achieve this? Thanks!

[Walter Roberson]

Your data is a cell array containing a structure array, not a pure structure array.

Answer 1

[Azzi Abdelmalek]

any(ismember(fields(data{1}),'oxy'))

[Leon]

Thank you so much for answering my question. It works great!

[Mr M.]

and how to chek the existance of data{i}.oxy or data.oxy or data(i).oxy?

[Walter Roberson]

Do you have a nonscalar cell array each containing a scalar structure, or a non-scalar struct array?