Matrix Grids are a data grid used in the Time Step Simulation tool's input and results pages. The time dimension is given to the rows in these grids, and the object fields (load MW, generator MW output, etc.) are given to the columns. The column header corresponds to the object's ID. The user options and simulation results determine the number of grid columns. For input pages, the user must enter hourly data for each object, for example, load, generator, and area. As a result, the user explicitly adds each column to the grid. A column is created in the custom result pages for each object whose results have been specified to be saved.