description: sigmoid-in-range[a,b] ket the in-range sigmoid if a <= x <= b, return x else return 0 examples: sigmoid-in-range[2,4] (|a> + 2|b> + 3|c> + 4|d> + 5|e>) 0|a> + 2|b> + 3|c> + 4|d> + 0|e> see also: