Base 10 hyperlog transform.
x : num | num iterable
values to be transformed.
b : num
Parameter controling the location of the shift from linear to log transformation.
r : num (default = 10**4)
maximal transformed value.
d : num (default = log10(2**18))
log10 of maximal possible measured value. hlog_inv(r) = 10**d
Array of transformed values. :