*λ ΈΑD;cs¬dZdkZd„Zdd„Z)eed„Z6eidƒZ7eed„ZCeed„Z TyUd k TWnVe j o WnXdS( sLThis provides useful general math tools. Functions: fcmp Compare two floating point numbers, up to a specified precision. intd Represent a floating point number as an integer. safe_log log, but returns an arbitrarily small number for log(0). safe_exp exp, but returns a large or small number instead of overflows. NcsUti||ƒ|jo dSn||jo d SndSdS(s$fcmp(x, y, precision) -> -1, 0, or 1iiN(smathsfabssxsys precision(sxsys precision((s*/mit/seven/lib/python/Bio/Tools/mathfns.pysfcmps   ics`!"d|}#|djo$t||dƒ}n&t||dƒ}'|SdS(sintd(x[, digits_after_decimal]) -> int x, rounded Represent a floating point number with some digits after the decimal point as an integer. This is useful when floating point comparisons are failing due to precision problems. e.g. intd(5.35, 1) -> 54. f10.0if0.5N(sdigits_after_decimals precisionsxsint(sxsdigits_after_decimals precision((s*/mit/seven/lib/python/Bio/Tools/mathfns.pysintds  csP)/0|djo 1|Sn2|djo 3|Sn4ti|ƒSdS(s₯safe_log(n, zero=None, neg=None) -> log(n) Calculate the log of n. If n is 0, returns the value of zero. If n is negative, returns the value of neg. if1e-100N(snsnegszerosmathslog(snszerosneg((s*/mit/seven/lib/python/Bio/Tools/mathfns.pyssafe_log)s   icsK7=>t|d|d|ƒ}?|tjo @|SnA|tSdS(s­safe_log2(n, zero=None, neg=None) -> log(n) Calculate the log base 2 of n. If n is 0, returns the value of zero. If n is negative, returns the value of neg. szerosnegN(ssafe_logsnszerosnegslsNonesLOG2(snszerosnegsl((s*/mit/seven/lib/python/Bio/Tools/mathfns.pys safe_log27s  cseCIJyKti|ƒSWn8Ltj o)M|djo N|SnO|SnXPd‚dS(s·safe_exp(n, under=None, over=None) -> e**n Guaranteed not to overflow. Instead of overflowing, it returns the values of 'under' for underflows or 'over' for overflows. isHow did I get here?N(smathsexpsns OverflowErrorsundersover(snsundersover((s*/mit/seven/lib/python/Bio/Tools/mathfns.pyssafe_expCs  (s*( s__doc__smathsfcmpsintdsNonessafe_logslogsLOG2s safe_log2ssafe_expscmathfnss ImportError(sfcmpssafe_logssafe_exps safe_log2smathsLOG2sintd((s*/mit/seven/lib/python/Bio/Tools/mathfns.pys?s