计算机仿真(龙格库塔方法)的软件VB设计与实现.doc

计算机仿真（龙格库塔方法）的软件VB设计与实现 Dim a(0 To 10) As Single, b(0 To 10) As Single, c(0 To 10) As Single, d(0 To 10) As Single Dim e(0 To 10) As Single, h(0 To 10) As Single, p(0 To 10) As Single, q(0 To 10) As Single Dim n1 As Byte, n2 As Byte n1表示的是y的阶数,n2表示的是输入函数的阶数 Dim i As Integer Dim f(0 To 2000) As Single f(m)=y,也就是各个时刻的y值 Dim X0(0 To 12) As Single, X1(0 To 12) As Single Dim dt As Single, u As Single dt为采样周期,u为输入 Dim q1 As Single, p1 As Single, h1 As Single, e1 As Single Dim b0(0 To 10) As Single, bn(-4 To 10) As Single Dim m As Integer Dim max As Single Private Sub Combo1_Click() n1 = Combo1.ListIndex + 1 n1表示的是y的阶数 For i = n1 + 1 To 8 Text1(i).Visible = False Label1(i).Visible = False Label9(i).Visible = False Next For i = 0 To n1 Text1(i).Visible = True Label1(i).Visible = True Label9(i).Visible = True Next Combo2.Clear Combo2.Text = 请选择输出u的最大阶数 For i = 0 To n1 Combo2.AddItem ((i) 阶) Next End Sub Private Sub Combo2_Click() n2 = Combo2.ListIndex n2表示的是输入函数的阶数 For i = n2 + 1 To 8 Text2(i).Visible = False Label2(i).Visible = False Label10(i).Visible = False Next For i = 0 To n2 Text2(i).Visible = True Label2(i).Visible = True Label10(i).Visible = True Next End Sub Private Sub Calculate_Click() dt = Val(Text3.Text) dt是采样周期 u = Val(Text4.Text) n1 = Combo1.ListIndex + 1 If n1 = 0 Then 对付忘记选择最高阶数时的情况 Call MsgBox(请选择阶数！, 48, 未选择阶数) Exit Sub End If For i = 0 To 12 设X0的初值都是0，且i大于8，这一点很重要！ X0(i) = 0 Next For i = 0 To n1 - 1 a(i) = -Val(Text1(i).Text) / Val(Text1(n1).Text) a(i)b(i)c(i)d(i)等等都是计算的中间变量 Next For i = 0 To n2 b0(i) = Val(Text2(i).Text) / Val(Text1(n1).Text) Next If Combo3.ListIndex = 1 Then n1 = n1 + 1 For i = n1 - 1 To 1 Step -1 a