step
Specifies the current SFA step. Must be
given in the right sequence: for SFA1 objects:
"preprocessing", "sfa"
for SFA2 objects:
"preprocessing", "expansion", "sfa" Each time a new step
is invoked, the previous one is closed, which might take
method
Method to be used: "SVDSFA" (recommended)
or "GENEIG" (unstable) for step="sfa"
Else use
"TIMESERIES" or "CLASSIF". GENEIG is not implemented in
the current version, since R lacks the option to
calculate generalized eigenvalues easily.