MATLAB: How to separate the field from a structure in MATLAB

cell arraycell arraysMATLABnonscalar structurestructures

I have a structure which is attached with this file named as 'shape.mat'. The structure contains the following fields: Geometry Boundary X Y…etc Now i want to separate X and Y field from the structure and store it in a cell named x_constraint and y_constraint respectively. Can it be done?

Best Answer

Your structure seems to be a nonscalar structure, so try using curly bracket:

load('shape.mat');
x_constraint = {S.X};
y_constraint = {S.Y};

For details, see Access Elements of a Nonscalar Struct Array

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repmat({struct('myfield',{})}, 2, 7)

Note the correction of struct('myfield',[]) to struct('myfield',{}). The version you had, with [], is for a 1 x 1 struct with a field that is initialized to []. The version with {}, creates a 0 x 0 struct with the field defined in its template but with no content. An "empty structure" should have have 0 as one of its dimensions or else it is not actually empty.

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wantedelements = yourstructure(strcmp({yourstructure.STYP}, 'EA030'))

{yourstructure.STYP} concatenate all the STYP fields into a cell array that you can then compare to your string to filter your array.

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