Text.FShow.RealFloat

A duplicate of the Show class.

Same as shows, but using an FShow instance.

Class for specifying display parameters. The type a is supposed to be an IEEE-ish (real) floating-point type with floating-point radix 2, such that the mantissa returned by decodeFloat satisfies

  2^(binExp x) <= fst (decodeFloat x) < 2^(binExp x + 1)

for x > 0, so binExp x = floatDigits x - 1. The number of decimal digits that may be required is calculated with the formula

  decDigits x = 2 + floor (floatDigits x * logBase 10 2).

The default implementation uses an approximation of logBase 10 2 sufficient for mantissae of up to several thousand bits. Nevertheless, hardcoding the values in instance declarations may yield better performance.

Show a signed DispFloat value to full precision using standard decimal notation for arguments whose absolute value lies between 0.1 and 9,999,999, and scientific notation otherwise. Analogous to showFloat from GHC.Float.

Show a signed DispFloat value using scientific (exponential) notation (e.g. 2.45e2, 1.5e-3).

In the call fshowEFloat digs val, if digs is Nothing, the value is shown to full precision; if digs is Just d, then max 1 d digits after the decimal point are shown. Analogous to showEFloat from Numeric.

Show a signed DispFloat value using standard decimal notation (e.g. 245000, 0.0015).

In the call fshowFFloat digs val, if digs is Nothing, the value is shown to full precision; if digs is Just d, then max 0 d digits after the decimal point are shown. Analogous to showFFloat from Numeric.

Show a signed DispFloat value using standard decimal notation for arguments whose absolute value lies between 0.1 and 9,999,999, and scientific notation otherwise.

In the call fshowGFloat digs val, if digs is Nothing, the value is shown to full precision; if digs is Just d, then max 1 d digits after the decimal point are shown. Analogous to showGFloat from Numeric.

newtype wrapper for Double. The Show (and FShow) instance displays numbers rounded to seven significant digits.

newtype wrapper for Double. The Show (and FShow) instance displays all significant digits.

newtype wrapper for Float. The Show (and FShow) instance displays numbers rounded to seven significant digits.

newtype wrapper for Double. The Show (and FShow) instance displays all significant digits.