2 dimensions: the Matrix Space ^ 1| / R1dT1 R1dT2 R1dT3 ... R3dTm \ | | | 2| | R2dT1 R2dT2 R2dT3 ... R3dTm | | | | 3| | R3dT1 R3dT2 R3dT3 ... R3dTm | . | | | . | | | . | | | n| \ RndT1 RndT2 RndT3 ... RndTm / +--------------------------------------------> time T0 Matrix M (n*m) m columns: Vectors N rows: Samples |