Wp.MatrixSourceMatrix dimensions. Encodes the number of dimensions and their kind
type env = {size_var : Lang.F.var list;size variables
*)size_val : Lang.F.term list;size values
*)index_var : Lang.F.var list;index variables
*)index_val : Lang.F.term list;index values
*)index_range : Lang.F.pred list;indices are in range of size variables
*)index_offset : Lang.F.term list;polynomial of indices
*)length : Lang.F.term option;number of cells (None is infinite)
*)}Type of matrix
Value of size variables