Question

我从事控制工程专业学生的申请。它可以绘制步进和脉冲图，计算传递函数，检查对象是否稳定等。我希望它绘制一个波德图，当我尝试这样做时，我就不能设置chart1.ChartAreas[0].AxisX.IsLogarithmic属于true的财产。它捕获异常，图表严重红色。

我认为这个问题是由负值引起的 - 我用非对数刻度绘制它，值从0到-200变化。有没有办法让它正常工作？

      chart1.ChartAreas[0].AxisX.IsLogarithmic = false;
      var series1 = new System.Windows.Forms.DataVisualization.Charting.Series
      {
        ChartType = SeriesChartType.Line
      };
      this.chart1.ChartAreas[0].AxisX.Minimum = 1;
      this.chart1.Series.Add(series1);
      this.chart1.ResetAutoValues();
      for (double i = 1; i < 10; i++) 
      {
        Complex y = TransferFunction.transmitancja_widmowa(i);
        double x = 20 * Math.Log10(y.Magnitude);
        MessageBox.Show(i.ToString());
        if (i > 0)  series1.Points.AddXY(i, x);
      }
      chart1.ChartAreas[0].AxisX.IsLogarithmic = true;
      chart1.Invalidate();

循环结果： `1.1：-3.44392273685111 1.2：-3.87389826338729 1.3：-4.29752280002408 1.4：-4.71291711058939 1.5：-5.11883360978875 1.6：-5.51449997972875 1.7：-5.89949601325708 1.8：-6.27365856592733 1.9：-6.63700925389649 2：-6.98970004336019 2.1：-7.3319726510657 2.2：-7.664128471124 2.3：-7.98650645445269 2.4：-8.29946695941636 2.5：-8.60338006570994 2.6：-8.89861721258189 2.7：-9.18554530550274 2.8：-9.46452265013073 2.9：-9.73589623427257 3：-10 3.1：-10.2571538390134 3.2：-10.5076631123304 3.3：-10.7518185461869 3.4：-10.9898963940118 3.5：-11.2221587827283 3.6：-11.4488541828714 3.7：-11.6702179579026 3.8：-11.8864729599972 3.9：-12.0978301484852 4：-12.3044892137827 4.1：-12.5066391946324 4.2：-12.7044590801796 4.3：-12.8981183911762 4.4：-13.0877777366472 4.5：-13.2735893438633 4.6：-13.4556975605639 4.7：-13.6342393291718 4.8：-13.809344633307 4.9：-13.981136917305 5：-14.1497334797082 5.1：-14.3152458418745 5.2：-14.4777800929462

5.3：-14.6374372124706 5.4：-14.7943133719774 5.5：-14.9485002168009 5.6：-15.1000851294023 5.7：-15.2491514753987 5.8：-15.3957788334531 5.9：-15.540043210119 6：-15.6820172406699 6.1：-15.8217703768841 6.19999999999999：-15.9593690626917 6.29999999999999：-16.0948768985328 6.39999999999999：-16.2283547952152 6.49999999999999：-16.3598611180083 6.59999999999999：-16.4894518216567 6.69999999999999：-16.6171805769466 6.79999999999999：-16.7430988894148 6.89999999999999：-16.8672562107454 6.99999999999999：-16.9897000433602 7.09999999999999：-17.1104760386703 7.19999999999999：-17.2296280894249 7.29999999999999：-17.3471984165568 7.39999999999999：-17.4632276508995 7.49999999999999：-17.5777549101192 7.59999999999999：-17.6908178711822 7.69999999999999：-17.8024528386535 7.79999999999999：-17.9126948091027 7.89999999999999：-18.0215775318696 7.99999999999999：-18.1291335664285 8.09999999999999：-18.2353943365686 8.19999999999999：-18.3403901815947 8.29999999999999：-18.4441504047382 8.39999999999999：-18.5467033189533 8.49999999999999：-18.6480762902615 8.59999999999999：-18.7482957787972 8.69999999999999：-18.8473873776963 8.79999999999999：-18.9453758499575 8.89999999999999：-19.0422851634008 8.99999999999999：-19.1381385238372 9.09999999999999：-19.232958406555 9.19999999999999：-19.326766586224 9.29999999999998：-19.4195841653081 9.39999999999998：-19.5114316010755 9.49999999999998：-19.6023287312851 9.59999999999998：-19.6922947986264 9.69999999999998：-19.7813484739829 9.79999999999998：-19.8695078785852 9.89999999999998：-19.9567906051162 9.99999999999998：-20.0432137378264`

如何使波德图正常工作？

0 个答案: