private NuGenFormula(string formel, NuGenPlotInterval intervall, Color frb, bool draw, NuGenFormula[] children, double param) { _formel = formel; _children = new NuGenFormulaCollectionBase(); if (children != null) { _children.AddRange(children); } this._param = param; this._formulaElement = NuGenInterpreter.ParseInfixExpression(formel); this._interval = intervall; this.frb = frb; this._paintValidate = new NuGenPlotInterval(0.0, 0.0); this.draw = draw; _pth = new GraphicsPath(); _pthasympt = new GraphicsPath(); }