ActiveState!

ActivePerl Documentation
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(Usage Statistics)
(about this ver)


* Getting Started
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* ActivePerl FAQ
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 Math::BigFloat - Arbitrary length float math package


NAME

Math::BigFloat - Arbitrary length float math package


SUPPORTED PLATFORMS

  • Linux
  • Solaris
  • Windows

SYNOPSIS

  use Math::BigFloat;
  $f = Math::BigFloat->new($string);
  $f->fadd(NSTR) return NSTR            addition
  $f->fsub(NSTR) return NSTR            subtraction
  $f->fmul(NSTR) return NSTR            multiplication
  $f->fdiv(NSTR[,SCALE]) returns NSTR   division to SCALE places
  $f->fneg() return NSTR                negation
  $f->fabs() return NSTR                absolute value
  $f->fcmp(NSTR) return CODE            compare undef,<0,=0,>0
  $f->fround(SCALE) return NSTR         round to SCALE digits
  $f->ffround(SCALE) return NSTR        round at SCALEth place
  $f->fnorm() return (NSTR)             normalize
  $f->fsqrt([SCALE]) return NSTR        sqrt to SCALE places


DESCRIPTION

All basic math operations are overloaded if you declare your big floats as

    $float = new Math::BigFloat "2.123123123123123123123123123123123";
number format
canonical strings have the form /[+-]\d+E[+-]\d+/ . Input values can have embedded whitespace.

Error returns 'NaN'
An input parameter was ``Not a Number'' or divide by zero or sqrt of negative number.

Division is computed to
max($Math::BigFloat::div_scale,length(dividend)+length(divisor)) digits by default. Also used for default sqrt scale.

Rounding is performed
according to the value of $Math::BigFloat::rnd_mode:
  trunc     truncate the value
  zero      round towards 0
  +inf      round towards +infinity (round up)
  -inf      round towards -infinity (round down)
  even      round to the nearest, .5 to the even digit
  odd       round to the nearest, .5 to the odd digit

The default is even rounding.


BUGS

The current version of this module is a preliminary version of the real thing that is currently (as of perl5.002) under development.

The printf subroutine does not use the value of $Math::BigFloat::rnd_mode when rounding values for printing. Consequently, the way to print rounded values is to specify the number of digits both as an argument to ffround and in the %f printf string, as follows:

  printf "%.3f\n", $bigfloat->ffround(-3);


AUTHOR

Mark Biggar

 Math::BigFloat - Arbitrary length float math package