Description:
A bpf sampler
<bpf> input from a table BPF
<mode> xfact, max, sum
<nsamp> number of samples ( echantillons) to be obtained
<xmin> minimum value of x in the table (specified by x-off)
<xmax> maximum value of x (specified by xzoom)
<oper> factor multiplying the ordinates
<ndec> number of decimals in the samples
xfact mode = samples a bpf with a scaling factor <oper> multiplying the ordinates
max mode = samples a bpf between O and maximum value <oper> of the ordinates
sum mode = samples a bpf with a fixed sum of values,
<oper> being the maximum value for the sum of the ordinates
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