Math::LinearCombination 0.03

Math::LinearCombination is a Perl module for representing mathematical linear combinations of variables, i.e. expressions of the format

 a1 * x1 + a2 * x2 + ... + an * xn

with x1, x2, ..., xn variables, and a1, a2, ..., an numerical coefficients. Evaluation and manipulation of linear combinations is also supported. The numerical coefficients a_i and variables x_i are stored as pairs in an internal data structure and should not be manipulated directly. All access and manipulation should be performed through the methods.

SYNOPSIS

 use Math::LinearCombination;
 use Math::SimpleVariable; # for the variable objects

 # build a linear combination
 my $x1 = new Math::SimpleVariable(name => 'x1');
 my $x2 = new Math::SimpleVariable(name => 'x2');
 my $lc = new Math::LinearCombination();
 $lc->add_entry(var => $x1, coeff => 3.0);
 $lc->add_entry(var => $x2, coeff => 1.7);
 $lc->add_entry(var => $x2, coeff => 0.3); # so x2 has a coefficient of 2.0
 print $lc->stringify(), "\n";

 # do some manipulations
 $lc->negate_inplace(); # reverts the coefficient signs
 $lc->multiply_with_constant_inplace(2.0); # doubles all coefficients
 
 # evaluate the linear combination
 $x1->{value} = 3;
 $x2->{value} = -1;
 print $lc->evaluate(), "\n"; # prints -14


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Requirements:

· Perl