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    Question

  • i have the equation

    f(x(i),y(j))=(x(i)^2-x(i))+y(i)

    where x(i)=i*h and h=0.1

    and y(i)=i*h

    by using 

    for i=1 to 5....next

    and for j=1 to 5....next

    i want to write that in visual basic . help me plz

    Wednesday, March 7, 2018 11:21 AM

All replies

  • Hello,

    Before anyone works with you on this, can you show us what you have tried so far using the code button.


    Please remember to mark the replies as answers if they help and unmark them if they provide no help, this will help others who are looking for solutions to the same or similar problem. Contact via my Twitter (Karen Payne) or Facebook (Karen Payne) via my MSDN profile but will not answer coding question on either.
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    Wednesday, March 7, 2018 11:47 AM
    Moderator
  • I think in your equation the y(i) should be y(j)?

    The first thing you should do is reduce the equations.


    You have:

            f(x(i),y(j))=(x(i)^2-x(i))+y(j)

    say     f = (x(i) ^ 2 - x(i)) + y(j)

    where
            x(i) = i * h
            y(j) = j * h
            h= 0.1

    Is that correct?

    therefore:

            x = 0.1i
            y = 0.1j
           
    now substitute:

            f = ((0.1 * i) ^ 2 - (0.1 * i)) + (0.1 * j)

    Then you need to write the code and display the result somehow. I used a textbox:

    So give it a go and then show us your code and exactly where you have questions if any.

    Wednesday, March 7, 2018 1:17 PM
  • Do you just want to know how to write that function in VB?

    'f(x(i),y(j))=(x(i)^2-x(i))+y(j)
    Private Function DoExpression(x() As Double, y() As Double, i As Integer, j As Integer) As Double
        Return (x(i) ^ 2 - x(i)) + y(j)
    End Function
    

    Then use it with something like:

    Dim xValues() As Double
    Dim yValues() As Double
    Dim i, j As Integer
    
    Dim result = DoExpression(xValues, yValues, i, j)
    


    Reed Kimble - "When you do things right, people won't be sure you've done anything at all"

    Wednesday, March 7, 2018 7:57 PM
    Moderator
  • Hi emanhh,

    The following code is to write the equation with vb.net.

       Dim h As Double = 0.1
            Dim xvalue As Double
            Dim yvalue As Double
            Dim xyvalue As Double
            For i As Integer = 1 To 5
                For j As Integer = 1 To 5
                    xvalue = i * h
                    yvalue = j * h
                    xyvalue = xvalue ^ 2 - xvalue + yvalue
                    Console.WriteLine(xyvalue)
                Next
            Next

    Best Regards,

    Cherry


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    Thursday, March 8, 2018 2:34 AM
    Moderator