Deleting specific values of fields inside a struct array

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Marc Laub
Marc Laub 2020 年 5 月 2 日
コメント済み: Marc Laub 2020 年 5 月 5 日
Hello everyone,
I have a struct array with multiple fields. All fields are arrays with the same length.
Is there away to delet a specific element from all field arrays at the same time?
So for example delete element 3 from field1, field2 and field3 under specific conditions, for example when field3 value==0.5.
I just know this way:
But is it possible to do this in on line instead of handling every field seperatly?
Best regrads
  1 件のコメント
Stephen23 2020 年 5 月 2 日
"But is it possible to do this in on line instead of handling every field seperatly?"
You could use a loop or structfun (which just hides the loop inside).
Note that comparing floating point numbers for exact equality is a common cause of bugs, you should probably compare the absolute difference against a tolerance:
idx = abs(A-B)<tol



Ameer Hamza
Ameer Hamza 2020 年 5 月 2 日
編集済み: Ameer Hamza 2020 年 5 月 2 日
Something like this
mask = a.field3==a.field3(5); % a.field3(5) is used as example
a = cell2struct(structfun(@(x) {x(~mask)}, a), fieldnames(a));
>> a
a =
struct with fields:
field1: [19×1 double]
field2: [19×1 double]
field3: [19×1 double]
An alternative way is to use the for-loop. It will probably be faster than the above code because it does not need to create a temporary cell array and recreate the struct.
mask = a.field3==a.field3(5);
names = fieldnames(a);
for i=1:numel(names)
a.(names{i})(mask) = [];
Note: If you are going to set the value for comparison with a.field3 arbitrarily, i.e., the comparison value is not already an element of the a.field3 itself. The comparison == for floating-point value can fail. In that case, you can define the mask based on tolerance.
mask = abs(a.field3 - 0.5) < 1e-6; % 1e-6 is the tolerance for the comparison with 0.5
  5 件のコメント
Marc Laub
Marc Laub 2020 年 5 月 5 日
Its ok,
I modified it anyway to:
mask = a.field3==2;
since my trigger value isalways 2, so its fine.


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