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Slope Function for VB 6.0

Posted on 2006-11-30
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Last Modified: 2008-01-09
Anyone know where I can see code for the Slope funtion written in VB?

I suppose I could write one but why reinvent the wheel.

I actually don't need it for two arrays necessarily.  The Y data will just be ascending dates
so I figure i can just use a count of the data in the X array.  I would think that would be valid?
Y       X
1       5
2       9
3       2
4       6
5       5
6       7

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Question by:mayfieldjr
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Éric Moreau earned 125 total points
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Hi mayfieldjr,

I did that in VB.Net a couple of months ago. You should be able to convert it easily.

Here is my code:
    Public Shared Function Slope(ByVal pArrayY() As Double, ByVal pArrayX() As Double) As Double
        Dim dblEX As Double
        Dim dblEX2 As Double
        Dim dblEXY As Double
        Dim dblEY As Double
        Dim intN As Integer
        For intCtr As Integer = 0 To pArrayX.Length - 1
            If (pArrayX(intCtr) <> Double.MinValue) AndAlso (pArrayY(intCtr) <> Double.MinValue) Then
                dblEX += pArrayX(intCtr)
                dblEX2 += (pArrayX(intCtr) * pArrayX(intCtr))
                dblEXY += (pArrayX(intCtr) * pArrayY(intCtr))
                dblEY += pArrayY(intCtr)
                intN += 1
            End If
        Next

        Dim dblA As Double
        Dim dblB As Double
        Dim dblAvgX As Double
        Dim dblAvgY As Double

        dblAvgX = dblEX / intN
        dblAvgY = dblEY / intN
        dblA = dblEXY - ((dblEX * dblEY) / intN)
        dblB = dblEX2 - ((dblEX * dblEX) / intN)
        Return (dblA / dblB)
    End Function

Cheers!
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by:mayfieldjr
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I'm not sure what Double.MinValue is????

I believe I have everything else.  Is Double.MinValue mean the min value in the array?

Thanks
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by:Éric Moreau
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it is the lowest value a double can hold. You can replace this with a value you are sure you won't find into your array.
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by:mayfieldjr
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I have tested your function but am getting a different answer than Excel gives me.

Example:
Y     X
1     7
2     1
3     4
4     8
5     8
6     4
7     9
8     8
9     1

I get .038   Excel gets .05

I either did not translate to VB properly (probably the case) or made some other error.  

What do you get using the above data with your function.

I'll keep trying.

Thanks
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by:mayfieldjr
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I see MY error now.  Works very well.

Thank you.  You saved me allot of time.
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