[R] un-expected return by fdim

[Fred J.]

Browse[1]> Lframe
   v  v  v  v  v  v v v
1  8  7  6  5  4  3 2 1
2  9  8  7  6  5  4 3 2
3 10  9  8  7  6  5 4 3
4 11 10  9  8  7  6 5 4
5 12 11 10  9  8  7 6 5
6 13 12 11 10  9  8 7 6
7 14 13 12 11 10  9 8 7
8 15 14 13 12 11 10 9 8
Browse[1]> fdim(Lframe,q=2)
Error in slopeopt(AllPoints, Alpha) : Object "LineP"
not found

thanks for any feed back