How to remove an element from a structure array using matfile handler

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Abdurrehman 2018-7-27

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https://ww2.mathworks.cn/matlabcentral/answers/412452-how-to-remove-an-element-from-a-structure-array-using-matfile-handler

编辑： Walter Roberson 2018-7-28

在 MATLAB Online 中打开

Hi,

I am using following piece of code to remove an element from a structure array, but its not working please help

MatfileHandler.StructureArray(index,:)=[];

since the above wasn't working thus I used following statements.

     AllElements = MatfileHandler.StructureArray; %loaded all elements in AllElements   
     AllElements(index,:)=[]; %Removed the required element
     MatfileHandler.StructureArray = AllElements; %Resaving the AllElements to Actual Matfile

the above code works fine but it takes too much time especially when the size of structure is big. Please help me how to reduce time or remove element by using matfile handler, thanks.

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Abdurrehman 2018-7-27

在 MATLAB Online 中打开

MatfileHandler = matfile('filename.mat','Writable',true);

My Structure is 36x1 array with 12 fields consisting of cell and double data types

Abdurrehman 2018-7-28

Precisely speaking I had to say matfile object

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Answer 1

Guillaume 2018-7-27

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https://ww2.mathworks.cn/matlabcentral/answers/412452-how-to-remove-an-element-from-a-structure-array-using-matfile-handler#answer_330673

As documented in the limitations of matfile, it does not let you index into the fields of a structure. Therefore the only way is to do what you have done: load the whole structure, edit the structure and write it back.