Constructornew
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.
Constructorzero
Arguments are treated as key-value pairs of object attributes. Returns a Math::Symbolic::Constant with
value of 0.
Constructorone
Arguments are treated as key-value pairs of object attributes. Returns a Math::Symbolic::Constant with
value of 1.
Constructoreuler
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'.
Constructorpi
Arguments are treated as key-value pairs of object attributes. Returns a Math::Symbolic::Constant with
value of pi. The object has its 'special' attribute set to 'pi'.
Methodvaluevalue() 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 if you're dealing with Variables or Constants. In case
of operators, a call with one argument will assume that the argument is a hash reference. (see next
paragraph)
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?) Since
version 0.132, an equivalent and valid syntax is to pass a single hash reference instead of a list.
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.
If a variable in the tree has no value set (and no argument of value sets it temporarily), the call to
value() returns undef.
Methodsignaturesignature() returns a tree's signature.
In the context of Math::Symbolic, signatures are the list of variables any given tree depends on. That
means the tree "v*t+x" depends on the variables v, t, and x. Thus, applying signature() on the tree that
would be parsed from above example yields the sorted list ('t', 'v', 'x').
Constants do not depend on any variables and therefore return the empty list. Obviously, operators'
dependencies vary.
Math::Symbolic::Variable objects, however, may have a slightly more involved signature. By convention,
Math::Symbolic variables depend on themselves. That means their signature contains their own name. But
they can also depend on various other variables because variables themselves can be viewed as
placeholders for more compicated terms. For example in mechanics, the acceleration of a particle depends
on its mass and the sum of all forces acting on it. So the variable 'acceleration' would have the
signature ('acceleration', 'force1', 'force2',..., 'mass', 'time').
If you're just looking for a list of the names of all variables in the tree, you should use the
explicit_signature() method instead.
Methodexplicit_signatureexplicit_signature() returns a lexicographically sorted list of variable names in the tree.
See also: signature().
Methodspecial
Optional argument: sets the object's special attribute. Returns the object's special attribute.
Methodto_string
Returns a string representation of the constant.
Methodterm_type
Returns the type of the term. (T_CONSTANT)
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