F() functions simulate jumping from one frequency to the next (or wave periods, as programmed in Day 009)
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Expression 7: "F" left parenthesis, StartFraction, floor left parenthesis, "x" , right parenthesis Over "R" , EndFraction , "f" Subscript, 0 , Baseline , right parenthesis left brace, 0 less than "x" less than "B" , right braceFfloorxR,f00<x<B
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Expression 8: "F" left parenthesis, StartFraction, floor left parenthesis, "x" , right parenthesis Over "R" , EndFraction , "f" Subscript, 1 , Baseline , right parenthesis left brace, "B" less than "x" , right braceFfloorxR,f1B<x