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Quadratic Equation In Vb ?


Is there anyway solving quadratic equation like
1.1 = 2.5 * S * S + 10 S

CAN BE MADE EASY ? does Vb support any special math functions for doing that ?




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Hi!

I'm kinda new at VBA and I would need some help. I have a problem with the quadratic equation(module12.bas). I needs to count how many tries it took to get the x1 and x2 and then put them on to the sheet.

I also have a second problem concerning drawing in VBA. I would like to know how to insert trees to the sheet, so they are further away from each other(they must be so that you can separate them by looking at them), at the moment they are like 2mm apart and that is not the way they should be.

I would really appreciate the help. Thanks!

Quadratic Equation
I have a function that takes in a value and performs some mathematical equations. In my program...I am throwing up a message box when value is below zero. My problem is this....suppose I had a graph and was plotting three points ( a line from (0,0) moving in a 45 angle up and to the right.) This would be ideal...but sometimes my values that are input by the user cause my equation to plot the first point at...lets say....(-3,3)...now the x value is negative and flags my error. I would like to make x equal to zero if x is negative. Heres my function...


Function ScaleAnalogOut(Value As Double, Chnl As Integer) As Long
Dim Temp As Double, d As Double
'want to get the counts from the proposed reading.
'solve for x where y = C + Bx + Ax^2
'A,B,C are scale factors from analog.dat
'using quadratic x = (-b + sqr(b^2-4ac))/2a
'A = scalef(2) B = scalef(1) and C=scalef(0) - value
'the following was used with linear mx+b

Temp = Value
If -AIOInfo(Chnl).ScaleF(2) = 0 Then 'linear
If AIOInfo(Chnl).ScaleF(1) = 0 Then
Temp = 0
Else
Temp = (Temp - AIOInfo(Chnl).ScaleF(0)) / AIOInfo(Chnl).ScaleF(1) * &H10000
End If
Else 'parabolic
d = AIOInfo(Chnl).ScaleF(1) ^ 2 - 4 * AIOInfo(Chnl).ScaleF(2) * (AIOInfo(Chnl).ScaleF(0) - Value)
If d < 0 Then
ErrorShow "Analog scale values invalid."
ElseIf d = 0 Then
Temp = -(AIOInfo(Chnl).ScaleF(1)) / (2 * AIOInfo(Chnl).ScaleF(2)) * &H10000
Else
Temp = (-AIOInfo(Chnl).ScaleF(1) + Sqr(d)) / (2 * AIOInfo(Chnl).ScaleF(2)) * &H10000
If Temp < 0 Or Temp > AIOInfo(Chnl).MaxRaw * &H10000 Then
Temp = (-AIOInfo(Chnl).ScaleF(1) - Sqr(d)) / (2 * AIOInfo(Chnl).ScaleF(2)) * &H10000
End If
End If
End If
If Temp < 0 Then '3/24/97
ErrorShow "Scaled value <0." & Value & " ->" & Temp & "Setting to 0."
ScaleAnalogOut = 0 * &H10000
ElseIf Temp > AIOInfo(Chnl).MaxRaw * &H10000 Then
ErrorShow "Scaled value > " & AIOInfo(Chnl).MaxRaw & "." & Value & " ->" & Temp & "Setting to " & AIOInfo(Chnl).MaxRaw
ScaleAnalogOut = AIOInfo(Chnl).MaxRaw * &H10000
Else
ScaleAnalogOut = Temp
End If
End Function

Quadratic Equation Graphing
OK heres the problem ive made the quadratic equation solver... but now, is there a way to graph them like in a calculator or something? if so could you tell me how and could you be specific because im a nub programmer who has been teaching himself. Anywho here is my current code if you see problems with it could you inform me plz.
Code:
Option Explicit

Private Sub Command1_Click()

Dim a As String
Dim b As String
Dim c As String
Dim intx1 As String
Dim intx2 As String

If txta = "" And txtb = "" And txtc = "" Then
MsgBox "Please Type a Quadratic Equation", vbOKOnly, "Error"
On Error Resume Next
ElseIf txta = "" Then
MsgBox "Please Enter a Numeric Value in the Box", vbOKOnly, "Error"
On Error Resume Next
ElseIf txtb = "" Then
MsgBox "Please Enter a Numeric Value in the Box", vbOKOnly, "Error"
On Error Resume Next
ElseIf txtc = "" Then
MsgBox "Please Enter a Numeric Value in the Box", vbOKOnly, "Error"
On Error Resume Next
ElseIf IsNumeric(txta) = False Then
MsgBox "Please Enter a Numeric Value in the Box", vbOKOnly, "Error"
On Error Resume Next
ElseIf IsNumeric(txtb) = False Then
MsgBox "Please Enter a Numeric Value in the Box", vbOKOnly, "Error"
On Error Resume Next
ElseIf IsNumeric(txtc) = False Then
MsgBox "Please Enter a Numeric Value in the Box", vbOKOnly, "Error"
On Error Resume Next
End If
a = txta
b = txtb
c = txtc
If (b ^ 2 - 4 * a * c) < 0 Then
MsgBox "Not a Real Root", vbOKOnly, "Error"
On Error Resume Next
End If
intx1 = (-b - Sqr(b ^ 2 - 4 * a * c)) / (2 * a)
intx2 = (-b + Sqr(b ^ 2 - 4 * a * c)) / (2 * a)

txtroot1.Text = intx1
txtroot2.Text = intx2

End Sub
Thanks i appreciate the help in advance. Ive also include my entire program if ya wanna look. Thanks.

Simple, Easy, Quadratic Equation.
hi, i'm kinda new at VB. I'm trying to make just the plus version of the quadric equation, not the minus. Can you tell me why this code does not give me the correct answer? thanks.


VB Code:
Private Sub Command1_Click()Dim joey As StringDim fatty As StringDim frank As StringDim harry As Stringfatty = "-" & b.TextIf InStr(b.Text, "-") Then fatty = Right(b.Text, 1)MsgBox fatty & "   <-- positive b"frank = (CInt(b.Text) * CInt(b.Text))harry = ((CInt(a.Text)) * CInt(c.Text))joey = ((fatty) + (Sqr(frank)) - (4 * harry)) / _(2 * (CInt(a.Text)))MsgBox joeyEnd Sub


Just wondering, thanks.... =D

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Does anyone know the command that is used to plot a line (say, y = x) or a quadratic (e.g. y=x^2)
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~Claudia

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Thanks...

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Hi guys
I want to invert a Quadratic function in visual basic
ex: y = x^2
inverse : x = y^-1/2

y = ax^2 + bx + c
x = ???


How can I solve this..?
Anyone have any idea? Maybe with some code..

Thank You

Regards
Andiga

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Hi all

I've created an app that works out an equation at the press of a button.

The equation is:
(x *10 + y) * z =
x, y and z are selected from ComboBoxes. Once selected, you pres the calculate button and Bingo! you hopefully get your answer.
Because x, y, and z are in 3 separate 'Private Subs' and the equation calculation is in a Sub of its own too, how do i get the equation to work?

In the cmdAnswer Private Sub, i've done :

Private Sub cmdOhms_Click()
Dim x As Long
Dim y As Long
Dim z As Long
Dim total As Long

total = (x * 10 + y) * z
lblOhms.Caption = total & " Ohms"
End Sub

but i keep on getting the answer 0 Ohms. Do i need to add anything alse to get it to work properly?

Any help would be gratefully appreciated
Thanks

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In a project I need to solve some 20 equations--how to supply these equations to the function (routine)?

Like, if unknow is "x" then in one equation , I have

1. sin (x) +3*x^3 +cot (2x)

Then,

some more complex equations--??

please help

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Hey,

Ok, i have got the equation:

(((X * X) - X) - 1) = 0

"X Squared, Minus X, Minus 1"

What i have to do is work out what x is to make 0 so say 3*3 - 3 - 1 etc. Does anyone know the answer or an program that will work out the answer. I have this:

#include <iostream.h>

void main (void)
{
float cur;
float x;
char *temp;

cur = 0.0;

do
{
cur = cur + 0.0000000000000000000000000000000000000001;

x = (((cur * cur) - cur) - 1);

cout << cur << " " << x << endl;

}while (x != 0);

cin >> temp;
}

but im not sure if thats working properly. It can be in vb or c++ but i just need to find what valuse X has to be so that X squared, minus X, minus 1 is equal to 0.

Thanks

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Visual.Basic(7) = Visual.Interdev(7) ?????

[Edited by matthewralston on 08-07-2000 at 07:42 AM]

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I am having trouble getting VB6 to do this equation V1 = ((W2 * V3 * COS)/W1) + (V4 * COS). Below is the proper answer based on the following.

W1 Weight (Kgs) of moving vehicle = 14500
W2 Weight (Kgs) of stopped vehicle = 1378
V3 Departure speed (Km/h) of moving vehicle = 24
V4 Departure speed (Km/h) of stopped vehicle = 27
COS Departure angle (degrees) of moving vehicle = 10
COS Departure angle (degrees) of stopped vehicle = 1

ANSWER: Speed of moving vehicle = 26.20093 Km/h

V1 = ((W2 * V3 * COS)/W1) + (V4 * COS)

When I do it in VB6 my answer comes up as 29.24210 Km/h. Which is apperently wrong. I have convered the degrees to radians as suggested, but it is still not right. Any help is greatly appreciated. Thank you.

In VB6 my code is:


Code:

Private Sub Command1_Click()
Dim PI As Double
PI = 3.14


Text7.Text = ((Val(Text2.Text) * Val(Text3.Text) * cos(Val(Text5.Text) * PI / 180)) / Val(Text1.Text)) + ((Val(Text4.Text) * cos(Val(Text6.Text) * PI / 180)))


End Sub

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I am trying to write a program that the user inputs an equation ex. x^2 + 2x + 3 into a cell. The user will then input the derivative of that equation into an adjacent cell (or if the program could take the derivative would be optimimum). But then evaluate the equation from x = 1 to 200. Could anyone be of assistance?

Thank you

Ali

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I would like to write a program that allows users to enter an equation (F) as a function of X and some value of X and the programme calculates the value of F. Pretty simple huh - but it's part of something grander (promise) and I just need to know how to get the program to interpret the typed equation as an equation that it can use.

e.g. user types: text1.text: 20*x + x^2 and text2.text: 10

x=val(text2.text)
result =F(x)

function F(x)
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M

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Can anyone tell me why this is happening. If I am adding an amount into an empty cell on my grid everything works fine, but if I am adding an amount to the cell again my total is wrong. Here's my code.

Code:
With YearGrid
If .TextMatrix(x, 3) = "" Then
.TextMatrix(x, 3) = Format$(EXPtxt, "$#,##0.00")
.TextMatrix(x, 4) = .TextMatrix(x, 4) - Format$(.TextMatrix(x, 3), "$#,##0.00")
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.TextMatrix(x, 4) = Format$(.TextMatrix(x, 4), "$#,##0.00")
End If
End With
The If statement work fine the ElseIf doesn't. Cell .TextMatrix(x, 4) comes up with a wrong amount. If I remove the Format$ from Format$(.TextMatrix(x, 4), "$#,##0.00") I get a totaly different value. Which is wrong also.

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For example: June 30, 2004 = Wednesday....
Thanks for any help!

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Hi guys, i'm having a little problem here, i'm trying to detect if there is a difference of 10 between 2 values which constantly changed, and if so i want to execute specific code. But with my code it seems to execute it anyway even if the values aren't 10 apart. Here is my code.


Code:
If (test1 - test2) > 10 Or (test1 - test2) < 1 Or (test3 - test4) > 9 Or (test3 - test4) < 0 Then
'execute code
End If
I haven't really done stuff like this before so i'm confused about it.

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I'm just a beginner trying to write the correct code for the following equation to build a program that helps me in my work as a doctor:

R0=P0/PVIxlog[(Pt/Pp)x(Pp-P0)/(Pt-P0)]

where:
R0 = resistance for absorption
P0 = initial pressure
PVI = pressure-volume index
Pt = final pressure
Pp = maximum pressure

It would be nice if someone could help me.
Thanks in advance.

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i have made an equation solver and need some help with it, i you could dload it and try it out you might beable to help fix it, there are 4 boxes p1,p2,v1,v2 put numbers in 3 of them and an x in the 4th it dosnt solve the equation right, thx for any help

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I want to develop a Program for Question Setter for a college. In which enter 50 questions in database and randomly select the 10 questions from database and prepare a question paper. The program should able to add new/reterive questions in english and typical Math/Phy equation.

Therefore, please anyone help me for mentioned problem

Thanx

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I have a date field in a MySQL table. What I want to do is, everytime I open my VB6 application, I want the lines to be deleted where the date=date+14. In other words, any row that is more than 14 days old needs to be deleted. I'm not sure how to do it in MySQL.


Code:
delete from my_table where date_column>date_column+14
Thanks

Equation From Text Box(es)
Hi,

I'm trying to get a equation like a + b = c to work from one text box?? So if i put it in the text box, what code do I need to run it?

If i change the equation to another one a - b = c, what code to use in the app?

So i enter these when the app is running? i want the answer to come out in another text box. Thanks guys.

Continuous Equation
Hey, I'm back in search of some more help! haha

Here's my situation. I have a program made that will take in information From an RFID reader through MSCOMM. Every time a RFID tag is scanned, the information from the card will be matched up to a "case" using Select Case. It will then output a price (specific to that case) to a text box.

What I want to do next is have that price go into an equation (X = X + Price).
I also initialize X = 0.

My problem is that when i scan a new card X ends up becoming equal to price, and not adding on to the previous value of X. I'm pretty sure that i need a Do Until loop so that it will continue to add to the previous value of X. But when I try using a while loop my program freezes up. Any suggestions?


Code:
Private Sub cmdRun_Click()
Dim Total As Currency
Dim Item As Currency
Total = 0

Select Case SomeString

Case "19C739F070000CC"
Text2.Text = "$6.26"
Item = 6.26

Case "19CAFDEF700001A"
Text2.Text = "$1.67"
Item = 1.67

Case "19CF4FCEF70000E5"
Item = 9999

Case Else
End Select

Do Until Item = 9999
Total = Total + Item
Loop

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First it has an integral. I barely know how they work much less how to put it in as code. I did some searching on the net not much luck.


Then the equation has a backwards upside down e which I believe is a partial differential. http://en.wikipedia.org/wiki/Partial_differential

it looks something like this

Cv = Cv + integral T * (pd^2 * P) / (pd * T^2) v dv

The Cv inside the equation has a * on top of the v

pd stands for partial differential

and the second to last v is a subscript next to the last )


I know this isnt much info but any help would be awesome!

Thanks guys.

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Hi,

I need to know if I can make an equation in an Equation Editor object in VB?

See, an equation like

c = n / V => ...

can be confusing in a textbox - so, an Equation Editor object would be just fine. But any ideas on how?

Thx,
Sveegaard

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Hi
How do I construct the following math equation in VB

Math Equation !!... How To ???
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I wanted to make an Equation for an Animation Lookup. Curframe is the "current frame" I make it increase over a set time. Here to a look. For some reason it only gets through the first 9 frames then stops.

VB Code:
Option Explicit Dim DX As New DirectX7Dim DD As DirectDraw7 Dim Primary As DirectDrawSurface7Dim Backbuffer As DirectDrawSurface7Dim SpriteBuffer As DirectDrawSurface7Dim ddsdPrimary As DDSURFACEDESC2Dim ddsdBackbuffer As DDSURFACEDESC2Dim ddsdSpriteBuffer As DDSURFACEDESC2 Dim DDclipper As DirectDrawClipper Global Running As Boolean 'blT Declarations Dim ddrval As LongDim rPriM As RECTDim rBacK As RECTDim rSprite As RECT ' Animation Timing/Frames/FlagsPrivate Type AnimationFrame    Top As Long    Left As LongEnd Type Dim Frame(24) As AnimationFrame ' Frames as ArraYGlobal CurFrame As Integer ' Current FrameGlobal Dir_up As Boolean ' Flag set when animation is playing forwardDim LastTimeDrawn As Long ' Time Last Frame was DrawnGlobal DelayTime As Single ' Delay Variable 'Direct SounD StuFFGlobal Perf As DirectMusicPerformanceGlobal seg As DirectMusicSegmentGlobal segstate As DirectMusicSegmentStateGlobal Loader As DirectMusicLoader Public Sub Initialize()'BuFFeR stuFF    Set DD = DX.DirectDrawCreate("")    Call DD.SetCooperativeLevel(FinaL.hWnd, DDSCL_NORMAL)        ddsdPrimary.lFlags = DDSD_CAPS    ddsdPrimary.ddsCaps.lCaps = DDSCAPS_PRIMARYSURFACE    Set Primary = DD.CreateSurface(ddsdPrimary)     ddsdBackbuffer.lFlags = DDSD_CAPS    ddsdBackbuffer.ddsCaps.lCaps = DDSCAPS_OFFSCREENPLAIN    Set Backbuffer = DD.CreateSurfaceFromFile(App.Path & "BlackBack.bmp", ddsdBackbuffer)     ddsdSpriteBuffer.lFlags = DDSD_CAPS    ddsdSpriteBuffer.ddsCaps.lCaps = DDSCAPS_OFFSCREENPLAIN    Set SpriteBuffer = DD.CreateSurfaceFromFile(App.Path & "eat.bmp", ddsdSpriteBuffer)    FrameLookup     Set DDclipper = DD.CreateClipper(0)    DDclipper.SetHWnd FinaL.hWnd    Primary.SetClipper DDclipper        'DirectMusiC    Set Loader = DX.DirectMusicLoaderCreate() 'DM    Set Perf = DX.DirectMusicPerformanceCreate()    Call Perf.Init(Nothing, 0)    Perf.SetPort -1, 80    Call Perf.SetMasterAutoDownload(True)    Perf.SetMasterVolume (75 * 42 - 3000)        Running = TrueEnd Sub Public Sub blt()     'Set PrimarY RecT    Call DX.GetWindowRect(FinaL.hWnd, rPriM)        'SeT rBack    rBacK.Bottom = ddsdBackbuffer.lHeight    rBacK.Right = ddsdBackbuffer.lWidth        'Set rSprite    rSprite.Top = Frame(CurFrame).Top 'Make Sprite = Frame(watever)    rSprite.Left = Frame(CurFrame).Left    rSprite.Bottom = rSprite.Top + 84    rSprite.Right = rSprite.Left + 84                If DX.TickCount >= LastTimeDrawn + DelayTime Then        LastTimeDrawn = DX.TickCount 'Every 25 milli's                If CurFrame = 0 Then Dir_up = True                If Dir_up = True Then            CurFrame = CurFrame + 1            If CurFrame = 25 Then            CurFrame = 13                Dir_up = False            End If        Else 'Animation is playing forward when last frame is reached-                        CurFrame = CurFrame + 1            If CurFrame = 25 Then                CurFrame = 13                Dir_up = False ' Play backwards, then forwards            End If        End If    End If                 ddrval = Backbuffer.BltFast(230, 150, SpriteBuffer, rSprite, DDBLTFAST_WAIT)    ddrval = Primary.blt(rPriM, Backbuffer, rBacK, DDBLT_WAIT)    End SubSub FrameLookup()' TranformStiLL *** Ima need an EquaTion Mad lonGDim I& If CurFrame < 10 ThenFor I = 0 To 9Frame(I).Top = 0: Frame(I).Left = I * 84Next If CurFrame >= 10 And CurFrame <= 19 ThenFor I = 10 To 19Frame(I).Top = 84: Frame(I).Left = I * 84Next If CurFrame >= 20 ThenFor I = 20 To 24Frame(I).Top = 168: Frame(I).Left = I * 84NextEnd IfEnd IfEnd IfEnd Sub


I wanted to make the top increase by 84 after the 9th and 19th frame, Seeing theres 10 frames across each row. And for left its supposed to multiply 84(the number of pixels to the next frame) times 84. For some reason those iF thens make the animation Stop at the 9th frame and make it go back to frame(0). Please Help thx.

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field1*field2*(field3+2)

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anyone know how to do?? pls help me!!!~

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X = &HFFFFFF54 And val(Text1.text)


How can i find the value of text 1.text while the value of x = 1

Please try to solve it .

Thanks a lot.

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Equation Question!
Lets say you have an equation in visual basic and it returns a number value (just whole numbers). Can visual basic look at that number and determine if its even or odd? If so, can someone tell me the code to perform this?

Thanks for any help

ThE fReEzEr

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w + x + y + z = 2
2w - x - y + 2z = 7
2w + 3x + 2y - z = -2
2w - 2x - y - 3z = -2

its 4 equation with 4 unknown variables, solve for w x y and z

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I mean Can you do this equation in VB?

6(a+24) + (a*20) = 78

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y = 2x^2+2x+C
I know it has to look something like this:

/


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