File: //usr/local/ssl/local/share/man/man3/Math::BigRat.3
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.\" ========================================================================
.\"
.IX Title "Math::BigRat 3"
.TH Math::BigRat 3 "2001-09-21" "perl v5.8.8" "Perl Programmers Reference Guide"
.SH "NAME"
Math::BigRat \- Arbitrary big rational numbers
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\& use Math::BigRat;
.Ve
.PP
.Vb 1
\& my $x = Math::BigRat->new('3/7'); $x += '5/9';
.Ve
.PP
.Vb 2
\& print $x->bstr(),"\en";
\& print $x ** 2,"\en";
.Ve
.PP
.Vb 2
\& my $y = Math::BigRat->new('inf');
\& print "$y ", ($y->is_inf ? 'is' : 'is not') , " infinity\en";
.Ve
.PP
.Vb 1
\& my $z = Math::BigRat->new(144); $z->bsqrt();
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
Math::BigRat complements Math::BigInt and Math::BigFloat by providing support
for arbitrary big rational numbers.
.Sh "\s-1MATH\s0 \s-1LIBRARY\s0"
.IX Subsection "MATH LIBRARY"
Math with the numbers is done (by default) by a module called
Math::BigInt::Calc. This is equivalent to saying:
.PP
.Vb 1
\& use Math::BigRat lib => 'Calc';
.Ve
.PP
You can change this by using:
.PP
.Vb 1
\& use Math::BigRat lib => 'BitVect';
.Ve
.PP
The following would first try to find Math::BigInt::Foo, then
Math::BigInt::Bar, and when this also fails, revert to Math::BigInt::Calc:
.PP
.Vb 1
\& use Math::BigRat lib => 'Foo,Math::BigInt::Bar';
.Ve
.PP
Calc.pm uses as internal format an array of elements of some decimal base
(usually 1e7, but this might be different for some systems) with the least
significant digit first, while BitVect.pm uses a bit vector of base 2, most
significant bit first. Other modules might use even different means of
representing the numbers. See the respective module documentation for further
details.
.PP
Currently the following replacement libraries exist, search for them at \s-1CPAN:\s0
.PP
.Vb 4
\& Math::BigInt::BitVect
\& Math::BigInt::GMP
\& Math::BigInt::Pari
\& Math::BigInt::FastCalc
.Ve
.SH "METHODS"
.IX Header "METHODS"
Any methods not listed here are dervied from Math::BigFloat (or
Math::BigInt), so make sure you check these two modules for further
information.
.Sh "\fInew()\fP"
.IX Subsection "new()"
.Vb 1
\& $x = Math::BigRat->new('1/3');
.Ve
.PP
Create a new Math::BigRat object. Input can come in various forms:
.PP
.Vb 9
\& $x = Math::BigRat->new(123); # scalars
\& $x = Math::BigRat->new('inf'); # infinity
\& $x = Math::BigRat->new('123.3'); # float
\& $x = Math::BigRat->new('1/3'); # simple string
\& $x = Math::BigRat->new('1 / 3'); # spaced
\& $x = Math::BigRat->new('1 / 0.1'); # w/ floats
\& $x = Math::BigRat->new(Math::BigInt->new(3)); # BigInt
\& $x = Math::BigRat->new(Math::BigFloat->new('3.1')); # BigFloat
\& $x = Math::BigRat->new(Math::BigInt::Lite->new('2')); # BigLite
.Ve
.PP
.Vb 5
\& # You can also give D and N as different objects:
\& $x = Math::BigRat->new(
\& Math::BigInt->new(-123),
\& Math::BigInt->new(7),
\& ); # => -123/7
.Ve
.Sh "\fInumerator()\fP"
.IX Subsection "numerator()"
.Vb 1
\& $n = $x->numerator();
.Ve
.PP
Returns a copy of the numerator (the part above the line) as signed BigInt.
.Sh "\fIdenominator()\fP"
.IX Subsection "denominator()"
.Vb 1
\& $d = $x->denominator();
.Ve
.PP
Returns a copy of the denominator (the part under the line) as positive BigInt.
.Sh "\fIparts()\fP"
.IX Subsection "parts()"
.Vb 1
\& ($n,$d) = $x->parts();
.Ve
.PP
Return a list consisting of (signed) numerator and (unsigned) denominator as
BigInts.
.Sh "\fIas_int()\fP"
.IX Subsection "as_int()"
.Vb 2
\& $x = Math::BigRat->new('13/7');
\& print $x->as_int(),"\en"; # '1'
.Ve
.PP
Returns a copy of the object as BigInt, truncated to an integer.
.PP
\&\f(CW\*(C`as_number()\*(C'\fR is an alias for \f(CW\*(C`as_int()\*(C'\fR.
.Sh "\fIas_hex()\fP"
.IX Subsection "as_hex()"
.Vb 2
\& $x = Math::BigRat->new('13');
\& print $x->as_hex(),"\en"; # '0xd'
.Ve
.PP
Returns the BigRat as hexadecimal string. Works only for integers.
.Sh "\fIas_bin()\fP"
.IX Subsection "as_bin()"
.Vb 2
\& $x = Math::BigRat->new('13');
\& print $x->as_bin(),"\en"; # '0x1101'
.Ve
.PP
Returns the BigRat as binary string. Works only for integers.
.Sh "\fIbfac()\fP"
.IX Subsection "bfac()"
.Vb 1
\& $x->bfac();
.Ve
.PP
Calculates the factorial of \f(CW$x\fR. For instance:
.PP
.Vb 2
\& print Math::BigRat->new('3/1')->bfac(),"\en"; # 1*2*3
\& print Math::BigRat->new('5/1')->bfac(),"\en"; # 1*2*3*4*5
.Ve
.PP
Works currently only for integers.
.Sh "\fIblog()\fP"
.IX Subsection "blog()"
Is not yet implemented.
.Sh "\fIbround()\fP/\fIround()\fP/\fIbfround()\fP"
.IX Subsection "bround()/round()/bfround()"
Are not yet implemented.
.Sh "\fIbmod()\fP"
.IX Subsection "bmod()"
.Vb 4
\& use Math::BigRat;
\& my $x = Math::BigRat->new('7/4');
\& my $y = Math::BigRat->new('4/3');
\& print $x->bmod($y);
.Ve
.PP
Set \f(CW$x\fR to the remainder of the division of \f(CW$x\fR by \f(CW$y\fR.
.Sh "\fIis_one()\fP"
.IX Subsection "is_one()"
.Vb 1
\& print "$x is 1\en" if $x->is_one();
.Ve
.PP
Return true if \f(CW$x\fR is exactly one, otherwise false.
.Sh "\fIis_zero()\fP"
.IX Subsection "is_zero()"
.Vb 1
\& print "$x is 0\en" if $x->is_zero();
.Ve
.PP
Return true if \f(CW$x\fR is exactly zero, otherwise false.
.Sh "\fIis_pos()\fP"
.IX Subsection "is_pos()"
.Vb 1
\& print "$x is >= 0\en" if $x->is_positive();
.Ve
.PP
Return true if \f(CW$x\fR is positive (greater than or equal to zero), otherwise
false. Please note that '+inf' is also positive, while 'NaN' and '\-inf' aren't.
.PP
\&\f(CW\*(C`is_positive()\*(C'\fR is an alias for \f(CW\*(C`is_pos()\*(C'\fR.
.Sh "\fIis_neg()\fP"
.IX Subsection "is_neg()"
.Vb 1
\& print "$x is < 0\en" if $x->is_negative();
.Ve
.PP
Return true if \f(CW$x\fR is negative (smaller than zero), otherwise false. Please
note that '\-inf' is also negative, while 'NaN' and '+inf' aren't.
.PP
\&\f(CW\*(C`is_negative()\*(C'\fR is an alias for \f(CW\*(C`is_neg()\*(C'\fR.
.Sh "\fIis_int()\fP"
.IX Subsection "is_int()"
.Vb 1
\& print "$x is an integer\en" if $x->is_int();
.Ve
.PP
Return true if \f(CW$x\fR has a denominator of 1 (e.g. no fraction parts), otherwise
false. Please note that '\-inf', 'inf' and 'NaN' aren't integer.
.Sh "\fIis_odd()\fP"
.IX Subsection "is_odd()"
.Vb 1
\& print "$x is odd\en" if $x->is_odd();
.Ve
.PP
Return true if \f(CW$x\fR is odd, otherwise false.
.Sh "\fIis_even()\fP"
.IX Subsection "is_even()"
.Vb 1
\& print "$x is even\en" if $x->is_even();
.Ve
.PP
Return true if \f(CW$x\fR is even, otherwise false.
.Sh "\fIbceil()\fP"
.IX Subsection "bceil()"
.Vb 1
\& $x->bceil();
.Ve
.PP
Set \f(CW$x\fR to the next bigger integer value (e.g. truncate the number to integer
and then increment it by one).
.Sh "\fIbfloor()\fP"
.IX Subsection "bfloor()"
.Vb 1
\& $x->bfloor();
.Ve
.PP
Truncate \f(CW$x\fR to an integer value.
.Sh "\fIbsqrt()\fP"
.IX Subsection "bsqrt()"
.Vb 1
\& $x->bsqrt();
.Ve
.PP
Calculate the square root of \f(CW$x\fR.
.Sh "config"
.IX Subsection "config"
.Vb 1
\& use Data::Dumper;
.Ve
.PP
.Vb 2
\& print Dumper ( Math::BigRat->config() );
\& print Math::BigRat->config()->{lib},"\en";
.Ve
.PP
Returns a hash containing the configuration, e.g. the version number, lib
loaded etc. The following hash keys are currently filled in with the
appropriate information.
.PP
.Vb 27
\& key RO/RW Description
\& Example
\& ============================================================
\& lib RO Name of the Math library
\& Math::BigInt::Calc
\& lib_version RO Version of 'lib'
\& 0.30
\& class RO The class of config you just called
\& Math::BigRat
\& version RO version number of the class you used
\& 0.10
\& upgrade RW To which class numbers are upgraded
\& undef
\& downgrade RW To which class numbers are downgraded
\& undef
\& precision RW Global precision
\& undef
\& accuracy RW Global accuracy
\& undef
\& round_mode RW Global round mode
\& even
\& div_scale RW Fallback acccuracy for div
\& 40
\& trap_nan RW Trap creation of NaN (undef = no)
\& undef
\& trap_inf RW Trap creation of +inf/-inf (undef = no)
\& undef
.Ve
.PP
By passing a reference to a hash you may set the configuration values. This
works only for values that a marked with a \f(CW\*(C`RW\*(C'\fR above, anything else is
read\-only.
.SH "BUGS"
.IX Header "BUGS"
Some things are not yet implemented, or only implemented half\-way:
.IP "inf handling (partial)" 2
.IX Item "inf handling (partial)"
.PD 0
.IP "NaN handling (partial)" 2
.IX Item "NaN handling (partial)"
.IP "rounding (not implemented except for bceil/bfloor)" 2
.IX Item "rounding (not implemented except for bceil/bfloor)"
.ie n .IP "$x ** $y\fR where \f(CW$y is not an integer" 2
.el .IP "$x ** \f(CW$y\fR where \f(CW$y\fR is not an integer" 2
.IX Item "$x ** $y where $y is not an integer"
.IP "\fIbmod()\fR, \fIblog()\fR, \fIbmodinv()\fR and \fIbmodpow()\fR (partial)" 2
.IX Item "bmod(), blog(), bmodinv() and bmodpow() (partial)"
.PD
.SH "LICENSE"
.IX Header "LICENSE"
This program is free software; you may redistribute it and/or modify it under
the same terms as Perl itself.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
Math::BigFloat and Math::Big as well as Math::BigInt::BitVect,
Math::BigInt::Pari and Math::BigInt::GMP.
.PP
See <http://search.cpan.org/search?dist=bignum> for a way to use
Math::BigRat.
.PP
The package at <http://search.cpan.org/search?dist=Math%3A%3ABigRat>
may contain more documentation and examples as well as testcases.
.SH "AUTHORS"
.IX Header "AUTHORS"
(C) by Tels <http://bloodgate.com/> 2001 \- 2005.