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MATLAB assigns a handle to every graphics object it creates. One can use this handle to change the object's properties. redAnTS creates a structure containing , called the "handles structure", that contains all the handles of the objects in its graphical user interface (GUI). It then augments this "handles structure" structure by adding fields corresponding to the mesh, material properties, nodal displacements, element strains, stresses, etc. In other words, the handles structure is the container that is used to store this FEA data. The handles structure is illustrated in the figure below.

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In the above figure, the fields guihandle1 and guihandle2 are handles for "objects" in the redAnTS GUI. The field mesh_data contains the mesh information (the x and y coordinates of the nodes etc.) and is, in turn, a structure. The field prop_data contains the materials material properties (E, nu) and is also a structure. Yada yada yada.

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