Return the grid list from a span and a period. 
- Parameters
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    | [in] | bounds | Input value span to split |  | [in] | xsize | Value size of the tiles |  | [in] | duration | Interval defining the size of the buckets |  | [in] | xorigin | Value origin of the tiles |  | [in] | torigin | Time origin of the tiles |  | [out] | rows,columns | Number of rows and columns in the output array |