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Why do you have to use 2 lists if there is only 1 necessary?
e.g SXX[{2, 4, 6}, {2, 4, 6}].
SXX[{2, 4, 6}, {1,2,3}] is possible but senseless. It leads to the same result as the example above.
You can write Polynom[A, B, C] without braces {}
but you have to use {} for TrendExp[{A, B, C}] as for all Trend-commands.
It should be the same way for both commands.
Version 3.1.226
Regards
Andreas
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