SFA2_CREATE Create an expanded SFA object. HDL = SFA2_CREATE(PP_RANGE, SFA_RANGE[, PP_TYPE, AX_TYPE]) creates an expanded SFA object, referenced by the handle HDL. PP_RANGE is the number of dimensions to be kept after the preprocessing step. Two preprocessing types can be chosen by setting PP_TYPE to either 'PCA' (principal components analysis) or 'SFA1' (linear SFA, default). 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 wither 'ORD1' (linear approx.) or 'ORD3a' (cubic approx.) (default: 'ORD1') See also SFA1_CREATE, SFA_STEP