exception Error of
val of_ascii :
char -> t
of_ascii xreturns the PHRED score encoded by ASCII character
x's ASCII code is not between 33 - 126.
val to_ascii :
t -> char
tas an ASCII character.
tcannot be encoded as a visible ASCII character (codes 33 - 126).
val of_probability :
?f:(float -> int) -> float -> t
of_probability ~f xreturns
-10 * log_10(x/(1-x)), which is the definition of Solexa scores.
Solexa scores are integral, and it is unclear what convention is
used to convert the resulting float value to an integer. Thus,
f is provided to dictate this. The default is to
round the computed score to the closest integer.
x is not between 0.0 - 1.0.
val to_probability :
t -> float
xto a probablity score. Note this is not the inverse of
of_probabilitydue to the rounding done by the latter.