how i'd solve for variance and Std. deviation. the project is meant to record housing prices, put them in a list box, and then compute these calculations
Public Class Form1
Dim intclicks As Integer = 0
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
End Sub
[code]....
How can I calculate standard deviation and variance of a field in my database by using OleDb and SQL language in vb 2010. I used VARIANCE and STDDVE and VAR_SAMP but they are undefined. There is other function for do this or there is any way to define this kind of SQL functions to
OleDb?
I am trying to convert the following code for the variance calculation
public static double Variance(this IEnumerable<double> source){
double avg = source.Average();
double d = source.Aggregate(0.0,
(total, next) => total += Math.Pow(next - avg, 2));
return d / (source.Count() - 1);
}
Described on CodeProject into corresponded VB.NET lambda expression syntax, but I am stuck in the conversion of Aggregate function. How can I implement that code in VB.NET?
I want to calculate variance of a col in my datatable object. If i apply datatable.compute(Var(...)), i gives a negative result. Variance can't be negative. And it I just apply it to half of the data, it works fine. Does datatable.compute has a limited capacity?
View 7 RepliesIn both C# and VB, type parameter modifiers are used to express the variance of type parameters. For example, the C# version looks like:
[Code]....
Since variance specifications basically restrict where and how a type parameter can be used, I tend to think of them as additional constraints on type parameters. I'm just curious as to why they aren't represented so. I mean, why are they represented in both languages as additional modifiers on type parameters, instead of being added to the type constraint list? If they were type constraints, the C# version would've looked like:
[Code]....
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
[CODE]
when i enter the date of birth using the datetimepicker box it automatically compute the age and output in a textbox.text?
View 2 RepliesI have the following code, the answer should be 2 though I am getting 3 everytime
[Code]...
I use the following columns stored in a SQL table called tb_player:
Date of Birth (Date), Times Played (Integer), Versions (Integer)
to calculate a "playvalue" (integer) in the following formula:
playvalue = (Today - Date of Birth) * Times Played * Versions
I display upto 100 of these records with the associataed playvalue on a webpage at any time.
My question is, what is the most efficient way of calculating this playvalue given it will change only once a day, due to the (today-date of birth) changing? The other values (times played & versions) remain the same.
Is there a better way than calculating this on the fly each time for the 100 records? If so, is it more efficient to do the calculation in a stored proc or in VB.NET/C#?
I have an openfiledialog, I show the dialog and the user selects there file. How could I calculate the MD5 hash of the OFD.filename/file opened? Or calculate the SHA1, what ever is easiest.
PS: This is in Visual basic 2010 Express.
Dim
Field1 as
Integer
() = {0, 1, 2, 3, 4, 5, 6, 7}
[code]....
i have the numbers in listbox as below:
01
02
04
09
10
the question is ..how to calculate different between all numbers... exampel between 04 and 09 ,we have 05,06.07 and 08 between 09 and 10 is 0
I have buttons with values. for exmp. btn1 = 5.50 btn2=3.25 etc...when someone click on btn will ask how many of these and let say you say 3 it will multiply that with 5.50 and show it on listbox.
View 1 RepliesI have a project to calculate how many day is there before 05/12/2010.
View 10 RepliesI am struggling with this code that I Have to do about calculating the nth term of the Fibonacci series. The program is supposed to take the value of n and return the corresponding nth Fibonacci number.If the function is given an
invalid n value, it should return -1.
[Code]...
Does anyone know how can I calculate pi (π) in VB?
View 6 RepliesCalculate sum in program? [code]...
View 5 RepliesGiven a distance (50km) as integer: 50
And a time as string in the following format:00:02:04.05
hh:mm:ss.ms
How would I calculate the avg speed in km/h?
I have 2 tables in sql server
1) I want to join those tables.
2)I have 2 columns in the table for eg:- outside temp and power by selecting the outside temp i want to calculate the average of the power with similar values.
Well I am working on this homework for my class and everything is ok but i can not get the monthly to calculate right. Cause when I taype in allen with the code of 1 the monthly should be 500 and the commission should be 1005. I have been working on this for days.[code]
View 5 RepliesI have to calculate 360 values, for every degree 1. I've calculated all the values but my problem now is that i have to put all of them in a graph with x and y axes that are labeled but I don't have a clue how to begin.
View 39 RepliesHow To Calculate Checkbox
View 1 Replieshow can calculate the total amount within this basis for UnitePrice in variablen below
View 4 RepliesI need to add 3 months to a date so i can calculate when a clients email bundle is out dated.so for instance the client registed his bundle on 2009/09/01. I need to be able to add 3 months to this date so it comes out with 2009/12/01 and then compare the dates.
View 1 RepliesI have 2 textboxes, txtStartDate.Text and txtEndDate.Text, user choose date through calendar date picker. Now I want to count the days between the two selected date and save the result in the database field totalDay(type integer), the following is my code: But when I click button and try to save it into database, I receive this error:
The version of SQL Server in use does not support datatype 'time'.
Imports System
Imports System.Data
Imports System.Data.SqlClient
Imports System.Threading
Imports System.Globalization
[Code] .....
i preparing a student marklist in vb.net,how to calculate rank (total,res(pass))wise,plz anybody send rank calculation coding
View 1 Repliesi want to calculate sum of two times example:
[Code]...
Producttable : PId, Openingstockdate , openingstock , Closingstockdate , Closingstock
Despatchtable : PId, Qty , date
Receipttable:PId, Qty , date
[code].....
I make a project car rentals but I have trouble counting time, to take the penalty when you return the car late,[code]but the results do not correspond..I want the result = 2 hours 10 minutes.
View 5 RepliesIn VFP9 we can use the followings and How to do it with vb.net?
[Code]...