internal Matrix BuildMatrix(Equation eqn)
{
var elems = eqn.GetElements();
var lhs = eqn.LeftSide;
var rhs = eqn.RightSide;
var matrix = new Matrix(elems.Count + 1, lhs.Count + rhs.Count + 1);
var i = 0;
foreach (var elem in elems)
{
var j = 0;
foreach (var term in lhs)
{
matrix.Set(i, j, term.CountElement(elem));
j++;
}
foreach (var term in rhs)
{
matrix.Set(i, j, -term.CountElement(elem));
j++;
}
i++;
}
return(matrix);
}
internal void CheckAnswer(Equation eqn, List <int> coefs)
{
if (coefs.Count != eqn.LeftSide.Count + eqn.RightSide.Count)
{
throw new BalancerException("Assertion error: Mismatched length");
}
var allzero = true;
foreach (var coef in coefs)
{
allzero = allzero && coef == 0;
}
if (allzero)
{
throw new BalancerException("Assertion error: All-zero solution");
}
foreach (var elem in eqn.GetElements())
{
var sum = 0;
var j = 0;
foreach (var term in eqn.LeftSide)
{
sum = CheckedAdd(sum, CheckedMultiply(term.CountElement(elem), coefs[j]));
j++;
}
foreach (var term in eqn.RightSide)
{
sum = CheckedAdd(sum, CheckedMultiply(term.CountElement(elem), -coefs[j]));
j++;
}
if (sum != 0)
{
throw new BalancerException("Assertion error: Incorrect balance");
}
}
}
