Similar to using VAL(a$) to return the numerical value of a string, is there a function for returning the solution of an equation that is user-typed into a textbox? For instance, user types F$=(a+b*x)/(c*x^2-d*x^3) where the variables of the equation are either pulled from a textbox or derived within the code. I am looking for something like F=Solve(F$).
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I need a VB.NET program to solve linear system with any number of equations
View 5 RepliesI am taken DateTimePicker2, DateTimePicker3 n textbox6.Now i wanted to display the result of subtraction of these two dates(DateTimePicker2-DateTime Picker3) in textbox6 automatically. I don't want to enter the result manually. Plz hlp me I need it badly. I hav already tried in lost focus event also its nt workin.
View 6 RepliesLet's say I wrote 1+1 in a text box1 how to get answer in a text box2?
View 10 RepliesI am trying to make a program to calculate the roots of a polynomial equation using the bisection method. I have designed the program so the user input a range of x values (x1 and x2) to solve for the root. When I debug the program I keep getting zero for the root. I know there must be something wrong the way I have my loop setup that keeps giving me a zero root. Here is what I have so far
Public Class Form1
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim x1 As Double
Dim x2 As Double
[code]....
I'm working on a calculator. So far I've made it so you can type in an equation with as many numbers as you want like 5+6-12*3/4 and it can solve it. My main problem now though is that it's solving the problem left to right instead of using PEMDAS. For example 2+6*2 should = 14 but when I type it in it will give me 16. My calculator isn't using parenthesis or exponents so I just want to put the multiplication, division, addition and subtraction in order when solving.Could a more experienced coder give me some pseudocode to make this possible please? So far for the calc I've been using regex a lot. Is there a way to achieve this without regex?
View 9 RepliesI have to calculate values of several equations in an application. For example, one these equations could be:
d = a + b*z + c*z (this is what is being displayed to the user, assume that 'a', 'b' and 'c' are provided as textboxes, assume that z is a hardcoded value for now)
Now, the user could enter a=1.5, b= -0.5 and c = -0.6 (or even 'a' could be negative). So, I just tried a sample code for simple values but to no avail...
Protected Sub Button1_Click(ByVal sender As Object, ByVal e As EventArgs) Handles Button1.Click
Dim val1, val2, val3_calculated, first, second As String
first = "8"
second = "3"
Dim arr(10) As String
[Code] .....
Error:
But it throws an error saying that I am not using any databind control.
Concerns:
First of all, is it necessary to use this "eval" operator in here? Is there any way to keep "-0.5" with the sign in asp.net using vb?
I am working on an assignment for Visual Basic, trying to write a program that will enable a user to enter a number and have it display that number and show in a listbox how it would multiply with numbers 1 through 12. An example of this is:
5 X 1 = 5
5 X 2 = 10
...
[code]......
Is there a way to create new mathematical equations at runtime? Obviously you can pass new variables to a given equation, but I need to make a new equation altogether (then give it variables).
[Code]...
What value will be returned from below execution with select, insert, update, delete?
Dim L_EXECUTED_NO1 As Integer = command.ExecuteNonQuery()
Dim L_EXECUTED_NO2 As Integer command.ExecuteReader()
Dim L_EXECUTED_NO2 As Integer = command.ExecuteScalar()
For example, I tried "Dim L_EXECUTED_NO1 As Integer = command.ExecuteNonQuery()" with Update SQL statement and that returned "-1". But it returned 1 for Delete SQL statement.
If Query_SQL("EXEC SP_ATT_CLOCK_INOUT_UPDATE '" & L_TODAY_DT & "', '" & L_EMP_ID & "', '" & L_START_TM & "', '" ) = True Then
MsgBox("Successfully saved!", MsgBoxStyle.Information)
End If
Function Query_SQL(ByVal SQL_Query) As Boolean
[Code] ......
this is the statement:select ITE.stock from orderdetails ord join ITEquipment ITE on ITE.product = ord.productnamey goal is to retrieve the stock from ITEquipment depending on the name of the product which has to match from orderDetails table. when I try this on the SQL SMS I get stock in two records of stock (for some reason 2 not 1, I should get 1)and then I try to use it in my application it returns a full set of records from orderDetails table instead of one record from the ITEquipment.
View 2 RepliesI found a great way to get the equations of calculations from application to Microsoft word file with MimeTex here-[URL]
But unfortunelly the code is only for Microsoft Visual Studio Solution under the Eq2ImgWinForms folder, but I use on my application Visual Basic language (Visual Basic 2008 Express Edition).
how could I use the same thing on my application with Visual Basic?
I don't know where the extra character 'N' is coming from, there should only be one parameter coming from my SP which is the ID:
cmd1 = oStringConnection.SetCommand(sqlConnectMain, _
cmd1, "TestStoredProc", _
DBConnections.myType.cmdAsProc)
[code]....
When I ran the SQL Profiler, I found this:
exec TestStoredProc @StudentID=N'12345'
here is my code for saving ..why it's not functioning... when i clicked no data in database.. no data at all and have an error Execution Failed:ORA-01036: illegal variable name/number what must i do..
[code]...
Due to the way I currently have it setup, the calculations are not being excecuted properly. I've been tweaking for a while and haven't gotten it yet. I think the problem is that certain equations are being done before certain terms are defined. If I click the calculate button multiple times, it works fine, but I need it to function on the first click.
Take a look:
Public Class frmford
Dim Make, Model, InitialPrice, Options, AirConditioningTax, GST, PST, Total, Subtotal, APR, Months, RoofRack, SunRoof, SideAirBags, TintedGlass, RearSpoiler, GPS, PowerLocks, FreightAndPDI, AirConditioning As Single
[CODE]...
I've made a fairly good Windows form application to solve quadratic equations, but I am having a hard time understanding the publication process microsoft uses in Visual Studio. I'd like to distribute my programm as freeware on my blog.
View 5 RepliesI'm using VB2008 Shell function to execute file with arguments. But I'm not sure how should look my PathName in Shell function with all necessary arguments and command-line switches. Without arguments: [Code]
View 4 Replieshow .net solve Dll problem??
View 1 RepliesThis is my matrix. I want to solve C,D and E
sample codes to solve C, D and E in VB.Net?
Answers are C=0.4857143, D=0.0000000 and E=-0.1428571 (manual calculation)
Lets say i have a text box and i type picturebox.visible = false; then i press a button to execute it. and My Picturebox is not visible now.so How do i run that command since it was in a text box???
View 7 RepliesI have a form, with one textbox. This textbox should be useable with commands such as examples:/title TITLE OF FORM so the form title is TITLE OF FORM (without /title infront) - I have tried with splits, serveral of string formats and much more but without any luck and i don't seem to find it on google with search tags: TextBox, Command, Strings etc.
View 1 RepliesI have this home work question and I don't know what I am doing wrong there are a lot of errors which I don't know how to correct. This the question:An automative service shop performs the following services (all the services below are assigned a value):
Oil Change
Lube Job
Radiator flush
Transmision flush inspection
Muffler replacement and
Tire rotation
Create an application that displays the total for a customer's visit. This is my code so far:
[Code]...
I have an equation in the form of a string:
Dim Answer as Integer
Dim AnswerBox as New RichTextBox
'... Settings for AnswerBox
[code].....
I would like to capture the command prompt text and place it into a textbox.
Process.start("C:cmd.exe","arguments")
this starts the command prompt
But how does one capture the command prompt text and place it into a textbox.
From what I have learned just about anything is possible.
I am working on a simple program called "Who's Connected?" where it runs a command (netstat -aon) and then displays the results in a multi-lined textbox. However, when I press the button that will run the command, it tells me that it can't convert the string to an integer or something. And when I did manage to get it to convert to an integer, it really showed an integer in the textbox instead of the connections and IP addresses. What do I do? Here is the code I have: Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click 'Running command and displaying results in textbox1 TextBox1.Text = CStr(Shell("netstat -aon"))'Results end up being a triple or quadruple digit number End Sub
View 2 RepliesI want to log lines written from a command line program (unrar.exe) to a multiline textbox.
View 2 RepliesThis piece of code grabs a customers hire record using their hire ID and displays their details in multiple textboxes. It all works fine and well, however, I can only run it once. If I type in another customers hire record ID it just displays the first customers details that were materialised, which I assume is because the datatable has been populated and not refreshed based on the new hire record ID I've entered.
[Code]...
With this I can search a column of a datagridview for a match. It works all fine and well, until I insert a new record into the database at which point I refresh the datagridview to display the newly added record. After I do this, I can no longer search using the textbox. Once again, I'm not quite sure what to do to fix this issue.
I have single-thread windows form application written with VB.NET and targeting Framework 1.1. The software communicates with external boards through a serial interface, and it mainly consist of a state machine that run some tests, driven in a loop done with a Timer and an Interval of 50ms. The feedback on the user interface is done through some custom events raised during the tests.
The problem that is driving me crazy is that the performance slightly decrease over time, and in particular after 1200/1300 test operations. The memory occupied does not increase over time, it is only the CPU that seems interested by this problem. The strange thing is that, targeting framework 2.0 and using the same identical code, I do not have this problem.
I know that is difficult without looking at the code, but do you have suggestions how can I approach the problem? EDIT: I am really lost, after a couple of intensive work the application starts slowing down. The selected row is related to its process, if it could help.
EDIT2: Using the Windows Task Manager I detected that the Handles counter is increased by 1 at the end of each operation. I don't know if it is the cause but the application starts to slow down when the handles counter reaches about 1500 handles. I checked that all necessary RemoveHandler are called after each operation. Any idea?
EDIT3: I found that the handles problem is generated by the C++ library we are using to communicated with the serial device. It then happens both in .NET 1.1 and .NET 2.0. The difference, and that's strange, is that if the target .NET 1.1 the application slow down/freeze instead for .NET 2.0 I reached more than 30000 handles without loosing performances. Now I don't know if the problem is really caused by this lost handles, I will try to ask to the developers of C++ library to correct the problem and see if it solves the problem I am having on .NET 1.1.
I am trying to combine 2 regular expressions into 1 with the OR operator: |
I have one that checks for match of a letter followed by 8 digits:
Regex.IsMatch(s, "^[A-Z]d{8}$")
I have another that checks for simply 9 digits:
Regex.IsMatch(s, "^d{9}$")
[Code]...
Apparently I am not combining the two correctly and apparently I am horrible at regular expressions.And for those wondering, I did take a glance at How to combine 2 conditions and more in regex and I am still scratching my head.
I am using window 7, when I run my code in local everything is alright, but when upload to window server 2003 the code will coming error "String was not recognized as a valid DateTime".My computer setting (date format) all same with my window server.[code]
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