NAME
Math::Symbolic::Constant - Constants in symbolic calculations
SYNOPSIS
use Math::Symbolic::Constant;
my $const = Math::Symbolic::Constant->new(25);
my $zero = Math::Symbolic::Constant->zero();
my $one = Math::Symbolic::Constant->one();
my $euler = Math::Symbolic::Constant->euler();
# e = 2.718281828...DESCRIPTION
This module implements numeric constants for Math::Symbolic trees.
EXPORT
None by default.
METHODS
Constructor new
Takes hash reference of key-value pairs as argument. Special case: a value for the constant instead of the hash. Returns a Math::Symbolic::Constant.
Constructor zero
Arguments are treated as key-value pairs of object attributes. Returns a Math::Symbolic::Constant with value of 0.
Constructor one
Arguments are treated as key-value pairs of object attributes. Returns a Math::Symbolic::Constant with value of 1.
Constructor euler
Arguments are treated as key-value pairs of object attributes. Returns a Math::Symbolic::Constant with value of e, the Euler number. The object has its 'special' attribute set to 'euler'.
Method value
value() evaluates the Math::Symbolic tree to its numeric representation.
value() without arguments requires that every variable in the tree contains a defined value attribute. Please note that this refers to every variable object, not just every named variable.
value() with one argument sets the object's value.
value() with named arguments (key/value pairs) associates variables in the tree with the value-arguments if the corresponging key matches the variable name. (Can one say this any more complicated?)
Example: $tree->value(x => 1, y => 2, z => 3, t => 0) assigns the value 1 to any occurrances of variables of the name "x", aso.
Method set_value
set_value() returns nothing and for constants, it doesn't do anything either.
Generally, set_value() works like this:
set_value() requires named arguments (key/value pairs) that associate variable names of variables in the tree with the value-arguments if the corresponging key matches the variable name. (Can one say this any more complicated?)
Example: $tree->set_value(x => 1, y => 2, z => 3, t => 0) assigns the value 1 to any occurrances of variables of the name "x", aso.
As opposed to value(), set_value() assigns to the variables permanently and does not evaluate the tree.
Method special
Optional argument: sets the object's special attribute. Returns the object's special attribute.
Method to_string
Returns a string representation of the constant.
Method term_type
Returns the type of the term. (T_CONSTANT)
AUTHOR
Steffen Mueller, <symbolic-module at steffen-mueller dot net>
New versions of this module can be found on http://steffen-mueller.net or CPAN.