checking if field values in a single struct are identical

2023 1 19
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更新时间：2023 2 1
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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

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Jan
Jan 2023-1-19
编辑：Jan 2023-1-19
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.

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Jan
Jan 2023-1-19

0 个投票

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.

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Davindra Usov
Davindra Usov 2023-1-19
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
Jan 2023-1-19
I assume, the shown code works for table objects also.

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Walter Roberson
Walter Roberson 2023-1-19

1 个投票

density_cell = structfun(@(C) {C.density}, YourStruct);
EQ = isequal(density_cell{:});
No explicit loop needed (but structfun is arguably a hidden loop.)

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