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Before going through this step, make sure you have gone through the first four steps of the

https://confluence.cornell.edu/display/SIMULATION/redAnTS+TUTORIAL+1+Problem+Specification

Introduction

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, called the "handles structure", that contains all the handles of the objects in its graphical user interface (GUI). It then augments this "handles structure" by adding fields corresponding to the mesh, material properties, nodal displacements, element strains, 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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