Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people, just like you, are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
Solved

Slope Function for VB 6.0

Posted on 2006-11-30
5
1,513 Views
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

0
Comment
Question by:mayfieldjr
  • 3
  • 2
5 Comments
 
LVL 70

Accepted Solution

by:
Éric Moreau earned 125 total points
ID: 18048242
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!
0
 

Author Comment

by:mayfieldjr
ID: 18048677
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
0
 
LVL 70

Expert Comment

by:Éric Moreau
ID: 18048861
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.
0
 

Author Comment

by:mayfieldjr
ID: 18049043
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
0
 

Author Comment

by:mayfieldjr
ID: 18049312
I see MY error now.  Works very well.

Thank you.  You saved me allot of time.
0

Featured Post

Announcing the Most Valuable Experts of 2016

MVEs are more concerned with the satisfaction of those they help than with the considerable points they can earn. They are the types of people you feel privileged to call colleagues. Join us in honoring this amazing group of Experts.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
Windows 10 start screen issues 9 55
Visual Basic Excel Formatting error 4 127
JSON Response and request in VB6 application 11 586
how to Classify of email (pdf attachments) 7 45
If you have ever used Microsoft Word then you know that it has a good spell checker and it may have occurred to you that the ability to check spelling might be a nice piece of functionality to add to certain applications of yours. Well the code that…
If you need to start windows update installation remotely or as a scheduled task you will find this very helpful.
As developers, we are not limited to the functions provided by the VBA language. In addition, we can call the functions that are part of the Windows operating system. These functions are part of the Windows API (Application Programming Interface). U…
This lesson covers basic error handling code in Microsoft Excel using VBA. This is the first lesson in a 3-part series that uses code to loop through an Excel spreadsheet in VBA and then fix errors, taking advantage of error handling code. This l…

837 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question