1. A computer-implemented method of transforming a first matrix, having a plurality of redundant matrix rows and non-redundant rows and including a parameter for a function for computing a redundant row from a non-redundant row, into a decompressed matrix, the method comprising at least one decompressor device performing steps of: reading selected matrix rows from said first matrix including at least all non-redundant matrix rows of the first matrix from a matrix memory; computing remaining redundant matrix rows of the first matrix from the read non-redundant matrix rows, wherein more than one of said redundant matrix rows are computed in parallel; and providing the read matrix rows and the computed remaining matrix rows as a decompressed matrix to an output matrix register.