SFA1_CREATE Create a linear SFA object. HDL = SFA1_CREATE(SFA_RANGE, AX_TYPE) creates a linear SFA object, referenced by the handle HDL. SFA_RANGE is the number of slowly-varying functions to be kept. AX_TYPE is the type of derivative approximation to be used. It can be either 'ORD1' (linear approx.) or 'ORD3a' (cubic approx.) (default: 'ORD1') See also SFA2_CREATE, SFA_STEP