Check for the existence of a variable inside a structure array

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Leon 2013-11-25

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/107464-check-for-the-existence-of-a-variable-inside-a-structure-array

评论： Walter Roberson 2018-10-16

采纳的回答： Azzi Abdelmalek

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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!

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Walter Roberson 2018-10-16

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

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采纳的回答

Azzi Abdelmalek 2013-11-25

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/107464-check-for-the-existence-of-a-variable-inside-a-structure-array#answer_116280

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

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Mr M. 2018-10-16

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

Walter Roberson 2018-10-16

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

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