Delete a line from a struct

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José Pereira 2017-12-9

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https://ww2.mathworks.cn/matlabcentral/answers/371986-delete-a-line-from-a-struct

评论： Image Analyst 2020-1-9

Hi, i have a structure with 9 lines and 4 fields. How can i delete line 4?

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Answer 1

Image Analyst 2017-12-9

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https://ww2.mathworks.cn/matlabcentral/answers/371986-delete-a-line-from-a-struct#answer_295425

在 MATLAB Online 中打开

See this link.

To remove a field from a structure use rmfield(). For example if the structure is called mystruct and has fields field1, field2, field3, and field4

mystruct.field1 = rand();
mystruct.field2 = rand();
mystruct.field3 = rand();
mystruct.field4 = rand();

and you want to remove the field named "field4" you can do

mystruct = rmfield(mystruct, 'field4');

Structures don't have lines, unless what you mean is that a specification of a line (like a vector of points, or a slope and intercept) are stored in a field.

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Answer 2

MeLearningProgramming 2020-1-9

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https://ww2.mathworks.cn/matlabcentral/answers/371986-delete-a-line-from-a-struct#answer_409358

structures can have lines: if you have

mystruct(1).field1 = rand();
mystruct(1).field2 = rand();
mystruct(1).field3 = rand();
mystruct(1).field4 = rand();

... till

mystruct(9).field1 = rand();
mystruct(9).field2 = rand();
mystruct(9).field3 = rand();
mystruct(9).field4 = rand();

you can remove a line like this:

mystruct(4) = [];

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Image Analyst 2020-1-9

Well that would be very non-standard terminology. You've showed a structure array, or vector since it's 1-dimensional. It's a vector where each element is a structure. And each structure in the array is an element of the vector. I've never heard anyone call it a line. For example, with a double vector = [1,2,3,4,5], I've never heard someone call the 4th element a "line" instead. But maybe that's what the original poster meant.

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