Solve Matrix In VB?
Mar 15, 2012This 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)
This 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)
how .net solve Dll problem??
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 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]
View 3 RepliesIn first search, result will show.In second search, the result in first searching will also show with the result in second searching. [code]
View 4 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 RepliesI have a lengthy query..always it shows timeout..I am filling it in a dataset, not using command execute.Is there anyway to solve this rather than optimizing the code? any way to solve the timeout..
View 3 RepliesLet's say I wrote 1+1 in a text box1 how to get answer in a text box2?
View 10 RepliesSo im making a program to solve second grage equations,its already working but i want to make it better,heres my idea.Right now the user must input the three equation coefficients (in a equation like 2x+2x+2 they are 2,2 and 2),i want to make it possible for them just to insert the equation like 2x+2x+2 and the computer will get that data,and extract the coefficients from it. [code]
View 1 RepliesSimilar 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$).
View 5 RepliesI get an Operator not defined error at "SetAttr(j = fo.GetFolder("C:\Documents and Settings\a19238\My Documents\VB Grille OrderTest\"))"
[code]...
i'm going to create event application where's times like:
a) 17:00
b) 18:00
c) 20:00
(Current compuer's time: 17:16)How do i make my application detect timezone and change a), b) and c) times for the same timezone, that people knows if event is my time 17:00 so what it is in their time?
insert sql statement in array (vb 2005), or any other ways to solve it??
View 1 RepliesThe port connection is successful but when it gets to receive data I get this timeout exception. Got no idea what to do...what to fix
System.TimeoutException: The operation has timed out.
at System.IO.Ports.SerialStream.Read(Byte[] array, Int32 offset, Int32 count, Int32 timeout)
[code].....
I need a VB.NET program to solve linear system with any number of equations
View 5 Repliesi am having the Visual basic code which is following..
View 3 RepliesPrivate Sub cmbEmployee_Validating(ByVal sender As Object, ByVal e As System.ComponentModel.CancelEventArgs) Handles cmbEmployee.Validating
[code]...
i have some problem for developing the code for addtion of 3x3 matrix class the code which i have develop is given below. but this class is not executed in vb.net code. dont know whats getting wrong in it as m nt getting the required result. in correcting the code as m new in vb.net.
[Code]...
I want to generate a matrix (7,4) with this output: (7lines and 4 columns) that has this structure(with this values)Column A1 and row B1 has 2 values (1 8 ), column A2 has 2 values (2 7 value in column A2) , column A3 has 3 6 value column A4 and row B1 has 4 5 value. And so on.How I can generate this matrix: [code] So my question is which condition to put to generate this matrix of this form.A cell A1,B1 contains two values (1 and 8 for example in cell B1).
View 1 Replieshow do i use pdfptable as a real table (A x B) instead of just (A x A)
declaring it this way gives me just one row:
Dim datatable As PdfPTable = New PdfPTable(4)
how can i declare it so that it has multiple rows and multiple columns?
I want to know if there is function to know whether the printer you are printing on is a dot matrix?
Our official receipt is printed in a dot matrix and must not be printed on any other kind of printer.
I have a matrix:
Module Procedimientos
Public Datos(200, 4) As String
Public Sub Inicio()[code]....
It is a Class made with the Add Windows Forms Menu.I have another Form where I added from the ToolBox the DataGridView Item.
Everything till now works like a charm, the problem comes when I try to load the matrix (previously posted) into the DataGrid. I search for the matrix via DataSource Button (from DataGrid's Properties) but I can't find it, it'll only show up the other forms. I don't know what I'm doing wrong.
So I'm developing a minesweeper game and i've assigned the mines, but I've got to generate the numbers around them. I've already developed the code, but it doesnt seem to be working.It's important to refer that I'm using a DataGridView.Here's how my code looks like now:
Declaring my variables:
Public line As Integer
Public column As Integer
Public numbandeiras As Integer
[code].....
I have a huge matrix that has million columns and thousands of rows in a plain text file. The file maybe have 50GB size.
I want to transite the matrix and save it to a new file.
I've been looking into this problem for a few days now and i can't find exactly the code that i want.I want to run a procedure using an incrementing matrix. If the Matrix that was used is correct then the correct matrix is shown.
the process is get first iteration process if incorrect repeat with next iteration correct end the issue is with the iterations and breaking out of them the matrix length, depth and iteration step can vary.
this is best shown in an example
length = 5
high = 3
low = 0
step 1
the iterations should look like
[Code]...
i am using TVS-MSP-250 Champion printer,i did a billing project all wrks and prints perfectly,but my client ask me to print tamil quatotion at the bottom of the page how can i print tamil characters in dot matrix,i used font such as amutham,saiindra,etc all are true type font i also try a method print#1, chrw(&HAB) it display tamil in msgbox, because i set window msgbox font as saiindra, if i print by using txtbox such kind of characters are print,no option to change font in printer properties,the default font in dot matrix printer is roman
View 2 Replieshere i am again asking for you assistance. what im trying to acheive is a datagriview that behaves like a matrix.ie. i have the following table
ProductName, ProductRegion, ProductType
Test1, RegionTest1, TypeTest1
Test2, RegionTest1, TypeTest2
Test3, RegionTest1, TypeTest3
Test4, RegionTest2, TypeTest1
Test5, RegionTest2, TypeTest2
what i need in output is something like the following:
<...........> RegionTest1 RegionTest2
TypeTest1 Test1 Test4
TypeTest2 Test2 Test5
TypeTest3 Test3
p.s. i would also need to be able to save it back to the database p.p.s cross posted on "vb dot net forums". but no replies in a while so im posting the same question on this forum.