public static Equation Add(this Equation equation, IEnumerable <Term> termsToAdd)
{
equation.AddToLeft(termsToAdd);
equation.AddToRight(termsToAdd);
return(equation);
}
public static Equation ReplaceVarWithExpression(this Equation equation, Variable varToReplace, IEnumerable <Term> aliasExpr)
{
var foundOnLeft = equation.LeftSide.SingleOrDefault(term => term.Variable?.Equals(varToReplace) ?? false);
var foundOnRight = equation.RightSide.SingleOrDefault(term => term.Variable?.Equals(varToReplace) ?? false);
if (foundOnLeft != null)
{
equation.AddToLeft(new Term[] { new Term {
SignedCoefficient = foundOnLeft.SignedCoefficient * -1, Variable = varToReplace
} });
equation.AddToLeft(aliasExpr.Copy().Multiply(foundOnLeft.SignedCoefficient));
}
if (foundOnRight != null)
{
equation.AddToRight(new Term[] { new Term {
SignedCoefficient = foundOnRight.SignedCoefficient * -1, Variable = varToReplace
} });
equation.AddToRight(aliasExpr.Copy().Multiply(foundOnRight.SignedCoefficient));
}
return(equation);
}
public void Extensions_AddToRight()
{
Assert.AreEqual("-3y1 +2y2 +1y3 +4y4 <= +5 +1y1 -2y2 +5y3", _eq.AddToRight(_terms).ToString());
}
