Question

How to I model an array function to fit my script?

Asked by: seeminglylost

I am in the process of using a two-dimensional array to find wind chill factors. My application uses a nudTemp for temperature and nudWind for Wind Velocity. When temp and wind are chosen from the nud list, it is supposed to display the wind chill temp in a text box and then display a message box. Right now it does everything it is supposed to do except that it does not display the proper wind chill factor.

I know it is an issue with my arrays so I was provided with an example but I don't know where it goes in my script or how to modify it so that it matches my code.

The example I was provided is:
[code]
Private arr1 As Integer() = New Integer() {10, 20, 30}
Private arr2 As Integer() = New Integer() {100, 200, 300}
Private arr3 As Integer(,) = New Integer(,) {{1000, 2000, 3000}, {2000, 4000, 6000}, {3000, 6000, 9000}}
Private Function GetVal3(ByVal val1 As Integer, ByVal val2 As Integer) As Integer
Dim index1 As Integer = Array.Index(arr1, val1)
Dim index2 As Integer = Array.Index(arr2, val2)

If index1 <> -1 AndAlso index2 <> -1 Then
Return arr3(index1, index2)
End If
End Function
[/code]

I am new to VB.net and we are on our second day of arrays so I am a little lost. Any assistance would be greatly appreciated.

I have provided my code listed below.

Option Strict On
Public Class frmWindChill
 
    Dim intWindChill(7, 5) As Integer
    Dim intWind(5) As Integer
    Dim intTemp(7) As Integer
 
 
    Private Sub nudTemp_ValueChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles nudTemp.ValueChanged
 
        intTemp(0) = -20
        intTemp(1) = -15
        intTemp(2) = -10
        intTemp(3) = -5
        intTemp(4) = 0
        intTemp(5) = 5
        intTemp(6) = 10
        intTemp(7) = 15
 
    End Sub
 
    Private Sub frmWindChill_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
 
    End Sub
 
    Private Sub btnSubmit_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnSubmit.Click
 
        txtWindChill.Text = CStr(intWindChill(7, 5))
        MessageBox.Show("The WindChill Factor is:" & intWindChill(7, 5).ToString)
 
 
    End Sub
 
    Private Sub nudWind_ValueChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles nudWind.ValueChanged
 
        intWind(0) = 5
        intWind(1) = 10
        intWind(2) = 15
        intWind(3) = 20
        intWind(4) = 25
        intWind(5) = 30
 
    End Sub
 
    Private Sub txtWindChill_TextChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles txtWindChill.TextChanged
 
        intWindChill(0, 0) = -26
        intWindChill(0, 1) = -46
        intWindChill(0, 2) = -58
        intWindChill(0, 3) = -67
        intWindChill(0, 4) = -74
        intWindChill(0, 5) = -79
        intWindChill(1, 0) = -21
        intWindChill(1, 1) = -40
        intWindChill(1, 2) = -51
        intWindChill(1, 3) = -60
        intWindChill(1, 4) = -66
        intWindChill(1, 5) = -71
        intWindChill(2, 0) = -15
        intWindChill(2, 1) = -34
        intWindChill(2, 2) = -45
        intWindChill(2, 3) = -53
        intWindChill(2, 4) = -59
        intWindChill(2, 5) = -64
        intWindChill(3, 0) = -10
        intWindChill(3, 1) = -27
        intWindChill(3, 2) = -38
        intWindChill(3, 3) = -46
        intWindChill(3, 4) = -51
        intWindChill(3, 5) = -56
        intWindChill(4, 0) = -5
        intWindChill(4, 1) = -22
        intWindChill(4, 2) = -31
        intWindChill(4, 3) = -39
        intWindChill(4, 4) = -44
        intWindChill(4, 5) = -49
        intWindChill(5, 0) = 0
        intWindChill(5, 1) = -15
        intWindChill(5, 2) = -25
        intWindChill(5, 3) = -31
        intWindChill(5, 4) = -36
        intWindChill(5, 5) = -41
        intWindChill(6, 0) = 7
        intWindChill(6, 1) = -9
        intWindChill(6, 2) = -18
        intWindChill(6, 3) = -24
        intWindChill(6, 4) = -29
        intWindChill(6, 5) = -33
        intWindChill(7, 0) = 12
        intWindChill(7, 1) = -3
        intWindChill(7, 2) = -11
        intWindChill(7, 3) = -17
        intWindChill(7, 4) = -22
        intWindChill(7, 5) = -25
 
    End Sub
 
    Private Sub btnReset_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnReset.Click
        txtWindChill.Text = ""
    End Sub
End Class

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Asked On: 2009-10-26 at 18:50:35ID24845860
Tags: VB.net using Visual Studio 2005
Topics: Business Objects
,; .NET
,; Microsoft Visual Basic.Net
Participating Experts: 3
Points: 500
Comments: 17

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Answers

by: roma2208Posted on 2009-10-26 at 21:37:24ID: 25669174

which control r u using for nudTemp?

by: roma2208Posted on 2009-10-26 at 21:54:46ID: 25669230

According to my understanding In UI i have one textbox in which i want to display the chill wind value, two buttons one for submit and one for reset. I have two combobox, one has datasource as Temp array and other has datasorce as wind array. According to the selected temp and wind value onclick of submit it will show you the chill wind value.

Try this code..

Public Class frmWindChill
    Dim intWindChill(7, 5) As Integer
    Dim intWind(5) As Integer
    Dim intTemp(7) As Integer 
    Sub getTemp()
        intTemp(0) = -20
        intTemp(1) = -15
        intTemp(2) = -10
        intTemp(3) = -5
        intTemp(4) = 0
        intTemp(5) = 5
        intTemp(6) = 10
        intTemp(7) = 15
    End Sub
    Sub getWind()
        intWind(0) = 5
        intWind(1) = 10
        intWind(2) = 15
        intWind(3) = 20
        intWind(4) = 25
        intWind(5) = 30
    End Sub
    Sub getWindChill()
        intWindChill(0, 0) = -26
        intWindChill(0, 1) = -46
        intWindChill(0, 2) = -58
        intWindChill(0, 3) = -67
        intWindChill(0, 4) = -74
        intWindChill(0, 5) = -79
        intWindChill(1, 0) = -21
        intWindChill(1, 1) = -40
        intWindChill(1, 2) = -51
        intWindChill(1, 3) = -60
        intWindChill(1, 4) = -66
        intWindChill(1, 5) = -71
        intWindChill(2, 0) = -15
        intWindChill(2, 1) = -34
        intWindChill(2, 2) = -45
        intWindChill(2, 3) = -53
        intWindChill(2, 4) = -59
        intWindChill(2, 5) = -64
        intWindChill(3, 0) = -10
        intWindChill(3, 1) = -27
        intWindChill(3, 2) = -38
        intWindChill(3, 3) = -46
        intWindChill(3, 4) = -51
        intWindChill(3, 5) = -56
        intWindChill(4, 0) = -5
        intWindChill(4, 1) = -22
        intWindChill(4, 2) = -31
        intWindChill(4, 3) = -39
        intWindChill(4, 4) = -44
        intWindChill(4, 5) = -49
        intWindChill(5, 0) = 0
        intWindChill(5, 1) = -15
        intWindChill(5, 2) = -25
        intWindChill(5, 3) = -31
        intWindChill(5, 4) = -36
        intWindChill(5, 5) = -41
        intWindChill(6, 0) = 7
        intWindChill(6, 1) = -9
        intWindChill(6, 2) = -18
        intWindChill(6, 3) = -24
        intWindChill(6, 4) = -29
        intWindChill(6, 5) = -33
        intWindChill(7, 0) = 12
        intWindChill(7, 1) = -3
        intWindChill(7, 2) = -11
        intWindChill(7, 3) = -17
        intWindChill(7, 4) = -22
        intWindChill(7, 5) = -25
    End Sub 
    Private Sub frmWindChill_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        getTemp()
        getWind()
        getWindChill()
        Me.ComboBox1.DataSource = intTemp
        Me.ComboBox2.DataSource = intWind
    End Sub 
    Private Sub btnSubmit_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnSubmit.Click
        txtWindChill.Text = CStr(intWindChill(Me.ComboBox1.SelectedIndex, Me.ComboBox2.SelectedIndex))
        MessageBox.Show("The WindChill Factor is:" & intWindChill(Me.ComboBox1.SelectedIndex, Me.ComboBox2.SelectedIndex).ToString)
    End Sub
  
    Private Sub btnReset_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnReset.Click
        txtWindChill.Text = ""
    End Sub
End Class

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by: seeminglylostPosted on 2009-10-27 at 03:52:13ID: 25670866

I am using NumericUpDown controls for nudTemp and nudWind.

I tried your code and it is giving me the following errors:
Error 1 'DataSource' is not a member of 'System.Windows.Forms.NumericUpDown'.
Error 3 'SelectedIndex' is not a member of 'System.Windows.Forms.NumericUpDown'.

Help?

by: roma2208Posted on 2009-10-27 at 03:57:29ID: 25670898

what you want in numeric up down ?

by: roma2208Posted on 2009-10-27 at 03:59:14ID: 25670906

can u explain me the UI in detail what you want to do so i can help you ?

by: seeminglylostPosted on 2009-10-27 at 04:09:02ID: 25670959

What I have is an application that has two NumericUpDown controls and one textbox. As well, two buttons. One submits and the other resets.

User chooses a temp from one NumericUpDown control and wind speed using the other control. The user would then click on submit. A corresponding wind chill factor should display in the textbox and then a Messagebox.Show() pops a message relating to the data in the textbox.

I am using Visual Studio 2005 and when I attempt to compile what you provided for code, I am getting the following errors:

Error 1 'DataSource' is not a member of 'System.Windows.Forms.NumericUpDown'.
Error 3 'SelectedIndex' is not a member of 'System.Windows.Forms.NumericUpDown'.

Right now, anything that has 'DaaSource' or 'SelectedIndex' is causing errors.

Untitled.jpg
- 216 KB
Screen shot of the application

by: seeminglylostPosted on 2009-10-27 at 04:11:25ID: 25670971

Sorry...I attached the incorrect screenshot. This is the correct one.

Untitled.jpg
- 216 KB
Screenshot

by: roma2208Posted on 2009-10-27 at 04:12:56ID: 25670980

Yes my previous code will give you the error because you haven;t mentioned any thing about numeric updown so i have used combobox instead of NumericUpdown.
If you will use combobox instead of numUpDown it will not give you error.

by: seeminglylostPosted on 2009-10-27 at 04:17:16ID: 25671004

Could you review the code? I have changed any values with ComboBox to NumericUpDown.

It is still giving the errors.

Option Strict On
Public Class frmWindChill
    Dim intWindChill(7, 5) As Integer
    Dim intWind(5) As Integer
    Dim intTemp(7) As Integer
    Sub getTemp()
        intTemp(0) = -20
        intTemp(1) = -15
        intTemp(2) = -10
        intTemp(3) = -5
        intTemp(4) = 0
        intTemp(5) = 5
        intTemp(6) = 10
        intTemp(7) = 15
    End Sub
    Sub getWind()
        intWind(0) = 5
        intWind(1) = 10
        intWind(2) = 15
        intWind(3) = 20
        intWind(4) = 25
        intWind(5) = 30
    End Sub
    Sub getWindChill()
        intWindChill(0, 0) = -26
        intWindChill(0, 1) = -46
        intWindChill(0, 2) = -58
        intWindChill(0, 3) = -67
        intWindChill(0, 4) = -74
        intWindChill(0, 5) = -79
        intWindChill(1, 0) = -21
        intWindChill(1, 1) = -40
        intWindChill(1, 2) = -51
        intWindChill(1, 3) = -60
        intWindChill(1, 4) = -66
        intWindChill(1, 5) = -71
        intWindChill(2, 0) = -15
        intWindChill(2, 1) = -34
        intWindChill(2, 2) = -45
        intWindChill(2, 3) = -53
        intWindChill(2, 4) = -59
        intWindChill(2, 5) = -64
        intWindChill(3, 0) = -10
        intWindChill(3, 1) = -27
        intWindChill(3, 2) = -38
        intWindChill(3, 3) = -46
        intWindChill(3, 4) = -51
        intWindChill(3, 5) = -56
        intWindChill(4, 0) = -5
        intWindChill(4, 1) = -22
        intWindChill(4, 2) = -31
        intWindChill(4, 3) = -39
        intWindChill(4, 4) = -44
        intWindChill(4, 5) = -49
        intWindChill(5, 0) = 0
        intWindChill(5, 1) = -15
        intWindChill(5, 2) = -25
        intWindChill(5, 3) = -31
        intWindChill(5, 4) = -36
        intWindChill(5, 5) = -41
        intWindChill(6, 0) = 7
        intWindChill(6, 1) = -9
        intWindChill(6, 2) = -18
        intWindChill(6, 3) = -24
        intWindChill(6, 4) = -29
        intWindChill(6, 5) = -33
        intWindChill(7, 0) = 12
        intWindChill(7, 1) = -3
        intWindChill(7, 2) = -11
        intWindChill(7, 3) = -17
        intWindChill(7, 4) = -22
        intWindChill(7, 5) = -25
    End Sub
    Private Sub frmWindChill_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        getTemp()
        getWind()
        getWindChill()
        Me.NumericUpDown1.DataSource = intTemp
        Me.NumericUpDown2.DataSource = intWind
    End Sub
    Private Sub btnSubmit_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnSubmit.Click
        txtWindChill.Text = CStr(intWindChill(Me.NumericUpDown1.SelectedIndex, Me.NumericUpDown2.SelectedIndex))
        MessageBox.Show("The WindChill Factor is:" & intWindChill(Me.NumericUpDown1.SelectedIndex, Me.NumericUpDown2.SelectedIndex).ToString)
    End Sub
 
    Private Sub btnReset_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnReset.Click
        txtWindChill.Text = ""
    End Sub
 
    Private Sub NumericUpDown3_ValueChanged(ByVal sender As System.Object, ByVal e As System.EventArgs)
 
    End Sub
 
    Private Sub NumericUpDown1_ValueChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles NumericUpDown1.ValueChanged
 
    End Sub
End Class

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by: roma2208Posted on 2009-10-27 at 04:21:15ID: 25671034

First keep combobox on Ui and change their name as NumericUpDown1 and NumericUpDown2 and now check will it still giving error ?

by: CodeCruiserPosted on 2009-10-27 at 06:04:12ID: 25671903

I think there are much better ways of doing what you are trying to do. I think you can populate a DataTable with the values and then use a RowFilter to find the value you need.

by: roma2208Posted on 2009-10-27 at 06:11:27ID: 25671974

There may be so many way to do one thing but unless and untill you will not explain what you exactly want i can't help. Up till now i have given you the solution according to your code.

If you can tell me your requirement in details then i can help you more.

by: roma2208Posted on 2009-10-27 at 06:13:29ID: 25671989

On submit button click event you have written the static value in textbox like intWindChill(7, 5) .. what should be there exactly.??

by: bhmahlerPosted on 2009-10-27 at 06:29:35ID: 25672145

Do you have to use the array or can you use a formula? There is a a formula for calculating windchill

    Private Function CalculateWindChill(ByVal Temperature As Integer, ByVal WindSpeed As Integer) As Integer
        If WindSpeed < 5 Then
            Return Temperature
        Else
            Return Math.Round((10.45 + (6.686112 * Math.Sqrt(WindSpeed)) - (0.44704 * WindSpeed)) / 22.034 * (Temperature - 91.4) + 91.4)
        End If
    End Function

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by: bhmahlerPosted on 2009-10-27 at 06:32:19ID: 25672165

Sorry, my bad, just read the last line in your question, didn't realize this was for a class. Well, now you have the function to calculate wind chill :)

by: seeminglylostPosted on 2009-10-27 at 06:42:26ID: 25672276

roma2208: The solution you provided works great using combo.box control. What I would like to use is NumericUpDown controls instead of the combobox control.

CodeCruiser: I am new to VB.Net so I am not familiar with creating DataTables. Thanks for the input.

bhmahler: I am using an array to display the wind chill factor. Thanks for the formula, I will save it as I know it will come in handy.

by: seeminglylostPosted on 2009-10-27 at 10:09:17ID: 31646244

Thanks!

20120131-EE-VQP-002

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How to I model an array function to fit my script?

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VB.net using Visual Studio 2005

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