MATLAB: Help with removing arrays from structure array

MATLABstructure array remove array index

Hello. I have 1×50 structure array called 'data2' with 18 fields. I am trying to remove arrays that have zero matrices in their fields. Example is data2(1) as shown below.
data2(1)
ans= 
 type: 'A321'
                 time: [0x1 double]
                  lat: [0x1 double]
                  lng: [0x1 double]
             altitude: [0x1 double]
  selected_altititude: [0x1 double]
                  BPS: [0x1 double]
                   RA: [0x1 double]
                  TTA: [0x1 double]
                   GS: [0x1 double]
                  TAR: [0x1 double]
                  TAS: [0x1 double]
              heading: [0x1 double]
                  IAS: [0x1 double]
                 Mach: [0x1 double]
                  BAR: [0x1 double]
                  IVV: [0x1 double]
                 wind: [0x1 double]
I am using the following code to try to remove the arrays.
for n = 1 : length(data2)
    if isempty(data2(n).TTA)
        data2(n) =[];
    end
end
Can anyone explain me what is wrong? (I am using the field TTA solely because of my preference. I can use any of them, since all of them are either zeros, or have values.) Thanks.

Best Answer

When you write
for k=1:2
   data(k)=[]
end
at the first iteration, the size of of data2 will be equal to 1. then, when k is equal to 2, you will get an error: Index exceeds matrix dimensions. You can do it without a for loop
data2=struct('field1' , {1 2 3 4 },'field2',{4 zeros(0,1) 40 zeros(0,1)})  % Example
a={data2.field2}
idx=cellfun(@isempty,a)
data2(idx)=[]
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