Why Might Different Computers Calculate Different Arithmetic Results
Mar 10, 2010
I have some software written in VB.NET that performs a lot of calculations, mostly extracting jpegs to bitmaps and computing calculations on the pixels like convolutions and matrix multiplication. Different computers are giving me different results despite having identical inputs. What might be the reason? I can't provide the algorithm because it's proprietary but I can provide all the relevant operations: [code]Is it possible that OrderBy is using a non-stable QuickSort and that QuickSort is using a random pivot?
I attempt to prepare printing document by using WinAPI instead of (System.Drawing.Printing.PrintDocument) because Graphic.DrawString does not render Khmer Unicode properly. Only TextRendering.DrawText renders it properly. I believe Graphic is GDI+ wrapper and TextRendering.DrawText is using GDI. Furthermore, PrintDocument does not work with TextRendering.DrawText.
Recently we have run into an issue with the Math.Round function. We have developed an application in VB.Net 2008. The executable is compiled to use .net framework 2.0. We have deployed the package to our users and at some sites we get a different result in a computation using Math.Round.
I must convert string data from a CNC that is arithmetic expression to a number that I can use in a VB application that I wrote. The following is what I get out of the cnc. [18722*65536+19377]/67108864. I need to evaluate this expression in my VB ap. The format of the string is not always the same as what I have illustrated.
I am trying to calculate the number of years for my calculate age event handler, however i am apparently missing a method or whatnot because im trying to calculate the age , can anyone suggest help on this. I need to subtract years to get my age but when i try the birthdate.Subtract (currentDate) method i get an error about not able to convert from LONG?
So below is what I have.
Private Sub btnCalculateAge_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnCalculateAge.Click Dim currentDate As Date Dim BirthDate As Date Dim Age As Long
I have a form that allows users to select file and then it reads the contents, parses the data and then executes a sql insert statement to add it to a database. What I am having issues with is showing real-time results. Currently, I have the import operation take place on the import form within the OnLoad event. The problem with this is it only shows the final results instead of the results real-time. Is there anyway to do this without creating a seperate thread and delegates?
I've never seen this error before; and apparently (According to DIC) the number would have be bigger than -9,223,372,036,854,775,808 to 9,223,372,036,854,775,807, to this this exception (I'm using an Integer, but I've tried Int64, and the same thing happens).
This is where the exception is being thrown:
Dim localPort As Integer = (tcpRow__1.localPort1 << 8) + (tcpRow__1.localPort2) + (tcpRow__1.localPort3 << 24) + (tcpRow__1.localPort4 << 16)
Full Code (Method)
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I highly doubt that that the integer that is being parsed back is greater than, either of those numbers listed above. I've tried using Int64, and even removing the << operator, but it's still throwing this exception.
I want to place the arithmetic operators in an array so I can randomly select one at a time. I am not sure how to declare and initialize them so that I can use them in an equation.
I am creating a final grade calculator for my Visual Basic Class...It takes 4 grade text box entries, adds them together and then divides by 4 to get the average grade...The average grade result needs to display one number past the decimal. (Ex: 89.2) I cant seem to be able to get the average grade result to display the 1 digit to the right of the decimal...
Private Sub Calculate_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Calculate.Click ' This event handler is executed when the user clicks the ' Calculate button. It calculates and displays the average
I'm trying to subtract 2 dates.: currentdate and a maxDate value that I have. If the difference between the 2 dates is 180 days then I want a messagebox to show up. Here's the code I have so far. Everything works except for the "currentDate - maxDate > 180" part. I get an error on that part.
Dim maxDate As DateTime = "1/1/1900" Dim x As Integer = 0 Dim currentDate As DateTime = DateTime.Now
I am in the process in implementing a Customer Billing Tracking System in VB.Net 2008 and using SQL Server 2005 as the database.How ever there are a few calculations and formulas i have to write (of coz, since it is a customer billing tracking system...)
I am using a DataReader to get data from a database. For some reason, I keep getting this error "Arithmetic operation resulted in an overflow." The error occurs on the line: courseID = (dr.Item("courseId"))
Ok so in my code i need a ****ing long as equation to draw a certain paint for getting the distance of a particle using the terminal velocity equation. which looks like this...
var.vt = ((2 * var.m * var.g) / ((var.fluiddensityp) * var.apaos * var.dragcoef)) ^ (1 / 2) then pop that in here to get terminal velocity at a given time... = var.xvalgraph1 * ((var.g * var.fluiddensityp * var.dragcoef * apaos) / (2 * var.m)) ^ (1 / 2) terminalvelocityovertime = vt * Tanh(tanhx)
then as I'm drawing a graph i calculate the previous coordinate and join then with a line.so i need a value called previous which is where ever there is a var.xvalgraph1 it minuses what ever time increments have been set so alll var.xvalgraph1 turn to (var.xvalgraph1 - var.timeperpixel)
ok thats all fine this is where the equations get too much and i don't work
Why a variable defined as a long will not accept this number (2,148,532,224) with out throwing an exception of "Arithmetic operation resulted in an overflow." Looking at documentation it should be able to handle a value up to 9,223,372,036,854,775,807.
My code does some simple calculations and then tries to store the value in the variable. Dim mdblTotalFileSize as Long = GetImageSizeBlocks * GetBlockSize The value for GetImageSizeBlocks is 1049088 and the value of GetBlockSize is 2048 which equals 2148532224
Whats the best way to include the Currency Symbol, without affecting arithmetic operations for example. Lets say I have a Listview which has one column named "Cost" where ill be a Currency Value which needs to carry the symbol for example "BsF. 22,34" or "$. 22,34". Lets say I need to apply aritmetics with those values after whats the best way to store em or at least ignore the symbol when using arithmetic on them?
How do you use money in visual basic I know that I have to set nickels and divide by 5 and I am suppose to have another expression to the number. Then i am suppose to determine what change i would have left so that way i can determine how many pennies I have.[code]
I am building an equation parser, it takes the equation "( 3456 + 321 * X ) / 45"
For example. As I couldn't find a direct solution to parse this equation, I split the equation and started implementing the operations 1 by 1 until I stuck with the execution order of the arithmetic operators (as the multiplication should be performed before the addition). So I am trying now to avoid this and try to parse the full equation. Is there a way to convert the string "+" to + for example?
I'm stumped with something I thought I had been doing fine for months now. I get the error, "conversion from string '''' to type 'Double' is not valid."I've also tried to Dim the variables within the private subs with different names and whatnot. I've commented out the TextBox10 and have decided that the error has something to do with me reassigning the textbox value to a variable.
I need to write software that will do a lot of math. Mostly it will be matrix multiplication with integers to compute DCT. How much faster should I expect the code to run in native c as compared to VB .Net? Factor of 2, factor of 10, factor of 1000...?
A recent assignment asked me to write a program to print a business expense report. The example form showed both a print and a print preview button so I assumed that meant not to show my output in a listbox. The problem that I had is I kind of ran into a catch 22 situation. If I declare some of the variables as strings, then I can't get the program to perform the addition arithmetic, it wants to only concatenate. If I declare them as integers or double then I can't get them to be recognized by the Drawstring command. The strange thing, to me as a beginner anyways, is that it did perform the arithmetic on a variable (meals) that I declared as a string initially. It multiplied it by 50% as I requested. If it wasn't for the concatenation, this would have worked perfectly according to the assignment.
The code is below:
Public Class frmBusiness Const One_Inch As Integer = 100 Const line_height As Integer = 25
For iLoop As Integer = 0 To length Dim byte1 As Byte = Fs1.ReadByte() Dim byte2 As Byte = Fs2.ReadByte() Dim offset As Byte = Fs1.Position() If byte1 <> byte2 Then OffSetFS.WriteByte(offset) OutPutFS.WriteByte(byte2) End If Next Arithmetic operation resulted in an overflow.
Dim f1 As String = "File1Path" Dim f2 As String = "File2Path" Dim Fs1 As New FileStream(f1, FileMode.Open) Dim Fs2 As New FileStream(f2, FileMode.Open) Dim f1length As Integer = Fs1.Length - 1 Dim f2length As Integer = Fs2.Length - 1
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Application.StartupPath & "PatchData.dat": PatchData.dat isn't created yet, but my program makes PatchData.dat, and PatchData.dat is ~8KB when my program gives me this error.
When developing ASP.NET websites (using VB.NET web forms) - a lot of my time is spend writing CSS files and they always seem to get messy (code duplication) and very long.
All I want to achieve is to be able to manipulate the CSS using VB.NET code in the following ways:
Use an integer variable to store my "golden" number 7 and use that for width, padding, margin etc where needed Use string variables to store my "golden" hex color codes e.g. "#44C5F2" and use them for color, background-color, border-color etc. where needed Use an integer variable to set the height of an element and have four child elements each with height: mynum / 4
I just want to use basic VB.net number and string manipulation in order to create a CSS file on the fly.
I understand that the end product - the CSS file shouldn't change much - it should at most change on a daily basis otherwise caching couldn't be used.[code]...
In this call to method SetVolume, Volume = 2055786000 and size = 93552000. Volume is an Integer property, and size is also Integer, as you can see.The class is a partial class of a dbml entity class, however this Volume property is NOT a column in the database, it exist only in the partial class, as a "business object property".
I am using the following code to add some value to a date: Dim strdate As Date Dim numinterval As Double numinterval = 149548.720386359 strdate = DateAdd(DateInterval.day, numinterval, #1/1/1601#) MsgBox(strdate)
The value numinterval is the number of days passed since 1/1/1601 (this is how date is counted for things like 'last logon time', 'last bad password' in Active directory). I do some calculation and get that numinterval value in days.. But since I want it to return the time more accurately, I tried first multiplying numinterval by 1400 for number of minutes.. And I changed the interval as dateinterval.minute... That worked fine!
But, when I tried again by multiplying it further by 60, to get the time accurately in seconds and changed the interval to dateinterval.second it throws the following exception: Arithmetic operation resulted in an overflow I changed the type of numinterval into long, but the same problem..
