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Converts L,M spin state specification to linear indexing specification. In the linear indexing convention, the states are listed in the order of inc reasing L rank, and, within ranks, in the order of decreasing M pro- jection. Syntax: I=lm2lin(L,M)

WARNING - zero base indexing, that is:

                          (L=0,M=0) -> I=0
                          (L=1,M=1) -> I=1
                          (L=1,M=0) -> I=2, et cetera...

Arrays of any dimension are accepted as arguments.