How to remove struct fields of a specific type

Question

Joe Gibbs 2023-7-7

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1992933-how-to-remove-struct-fields-of-a-specific-type

回答： Paul 2023-7-7

I have a struct that contains data of various formats including further structs and instances of class objects. I would like to remove all fields that are of a specific type without needing to use their field names.

For example, the trackingScenario struct contains a varying number of "Tracker" objects that I would like to remove if desired. I have posted an example of the struct below.

struct with fields:

configData: [1×1 struct]

simulation: [1×1 struct]

Platform_1: [1×1 struct]

Platform_2: [1×1 struct]

Platform_3: [1×1 struct]

Platform_4: [1×1 struct]

Target_1: [1×1 struct]

Target_2: [1×1 struct]

new_test_tracker2: [1×1 Tracker]

The desired output would be the struct without the "Tracker" field. This has stumped me so thanks in advance!

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Answer 1

Paul 2023-7-7

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https://ww2.mathworks.cn/matlabcentral/answers/1992933-how-to-remove-struct-fields-of-a-specific-type#answer_1268903

在 MATLAB Online 中打开

The function class can be used in a loop over the fieldnames to identify the fields to be removed with rmfield.

s.w = int32(0);
s.x = 1;
s.y = 2;
s.z = int32(3);
s
s = struct with fields:
    w: 0
    x: 1
    y: 2
    z: 3
% remove the int32 fields
fnames = fieldnames(s);
for ii = 1:numel(fnames)
    if string(class(s.(fnames{ii}))) == "int32"
        s = rmfield(s,fnames{ii});
    end
end
s
s = struct with fields:
    x: 1
    y: 2

The function isa might also do the job of identifying the field to be removed, depending on the class hierarchy and if you want to remove objects basedon their superclass.