Arrays / Lists And Computing HashValues
Jun 13, 2010
I've had experience with using hashvalues from String objects. E.g., if I have StringA and StringB both equal to "foo", they'll both compute out the same hashvalue, because they're set to equal values. Now what if I have a List, with T being a native data type. If I tried to compute the hashvalue of ListA and ListB, assuming that they'd both be the same size and contain the same information, wouldn't they have equal hashvalues as well?
Assuming as sample dataset of 'byte' with a length of 5
{5,2,0,1,3}
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Dec 2, 2010
I need to create an console application that computes the average monthly rainfall, number of months with above average rainfall, and the number of months with below average rainfall, given the rainfall amounts for each month in a particular year. The program must read in and store in an array the monthly rainfall amounts entered by the user one by one.
So far this is what I have got
Const intMonths As Integer = 11 'Constant Month variable
Dim sngRainfall(intMonths) As Single 'Rain for the month
Dim intCount As Integer ' Loop Counter
Dim sngTotalRainfall, sngAvgRainfall As Single 'Total and Average Rainfall
[Code] .....
How to set this up properly and I am having a real hard time figuring out how to make the data go from this loop to another and add the data to the total.
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Jun 24, 2011
I have been assigned a program for homework in which I need to take in information about songs from a text file and then be able to sort the list alphabetically, by genre and by length. I also need to be able to filter it by genre. The user can then move songs they choose from the master list to a playlist where again the list can be sorted by either genre or play order.My book only covered sorting array when they are one dimensional however I need to be able to sort a multidimensional array by different columns. I asked my teacher but she had so much going on that we didn't really have time to get into it, so I decided to ask here.
I'm not looking for code, just to get pointed in the right direction. For instance rather than using a multidimensional array would it be better to pull the values in and then put them into an array of song objects with properties for each value? And if I choose to go that route is an array the best structure to use? I have to use an array of some type, but the problem says nothing about whether or not it can be a list or other array type structure.
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May 2, 2012
I declare my 2D lists:
Dim _invoiceitems As New List(Of List(Of String))
Dim _dbitems As New List(Of List(Of String))
Each List is filled like this: Example Code To fill:
_invoiceitems.Add(New List(Of String))
_invoiceitems(0).Add("Code #")
_invoiceitems(0).Add("Quantity")
Well, now i need a third list called (_changesitems) Note that this result with the differences: be the result of subtraction of quantities if this is found (dbitems - invoiceitems).
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Nov 11, 2011
I have a pipe delimited file with 3 values on each line, something like this:
0001|234587|Bracket, 3 x 3 x 0.125, Steel
0001|254378|Bracket, 4 x 4 x 0.125, Steel
0003|234587|Hinge, 4 x 4 x 0.125, Brass
The first Value can be duplicated in the file, the second value also can be duplicated. There are no instances of BOTH values duplicated on 2 or more lines. I need to read another file and get the first 2 values, then look up those two on one line to get the proper 3rd value. The "other" file looks a bit like this:
0E0522070001EF54ED7823458700FF00FFA5A5A5A5
-----------XXXX-----------XXXXXX--------------------- (X's are the data, the rest is filler to comply with some code unknown to me)
Right now I have code to read all into an array (split on vbcrlf), then split each line on "|" and populate three arrays, I then go thru every element of the first column that matches the value I am looking for and test that the second column also matches the second value and if so, return the third array contents at the same index. This seems crude and inefficient. Cannot use a hashtable (I don't think) as it only supports 2 values. A List(Of) doesn't seem to work either and I don't want to use a database.
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Dec 23, 2011
Find common values in multiple arrays with PHP Pretty much does what I need, but in PHP, I need VB. My situation is I am trying to create an intelligent stock pick system based on multiple stock locations. At the point of invoicing, we loop through the items invoiced and check the stock database for available stock.
If all items on the invoice are available to pick from stock location 1, then all should be picked from stock location 1... etc. If all most items are available from stock location 1 except one or two, then pick all stock from stock location 1 except for the exceptions which should be picked from the location with the highest available stock. Finding highest available stock is simple, but I can't work out how to analyse the stock availability from multiple locations and finding the common stock locations.
[Code]...
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Mar 17, 2010
I was wondering how you create a form with three lists. Each list representing a different array.
I guess the question is how do you take an array and make it into a list so it shows up on a list box?
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Dec 15, 2011
my binary search isnt working, i think it has to do with the fact that im using a list and its searching thru an array
List
Option Strict On
Public Class Form1
[Code].....
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Jun 27, 2011
Basically what I'm having to do is create a program that takes a list of CaseIDs and compares them to a table on a remote SQL server. However, the table holding the CaseIDs on the remote server has nearly 120,000 records.
Currently my plan is to query all records on the remote server, save the query and the current list to tables in an Access DB file and then run an outer join to see which CaseIDs have no matching records on the remote server.
I believe this will be a much slower process than I would like. If I could load both queries into arrays or lists in VB and then compare them (therefore, not having to write 120,000 records to a DB file), it would be much faster.
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Mar 2, 2010
Ever since I started using VB.Net I have been using the Generic List collection List(Of <Type>). Arrays, I haven't used so much. I used them a lot more when I wrote C code years ago.
1.) Are arrays considered a type of collection like Lists, Dictionary, Queue etc are? Or are they in their own category.
2.) Can I iterate over an array with a For Each loop like I can with other collections or do I stick with the normal For loop for arrays?
3.) There are certain methods that return arrays. Can I set a list object to hold this return value instead of an array?
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Jun 27, 2012
I'd like to give a homework assignment to a person learning VB.NET. I'd like it to use basic inheritance and a variety of data structures including queues, lists, arrays, or stacks in a windows forms application. I was thinking of a pizza-ordering application. This would allow them to utilize some basic inheritance and practice using .NET UI elements.
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Apr 1, 2011
I have two lists. One list is a list of names, the other list is a list of how many times each name is found in the first list noted in the database
so...
Nick
John
Jim
Jack
is the firs tlist
10
13
13
2
is the second list. Nick had 10, john 13 and so on.I want to sort the second list from large to small, but have the index for the first list still linked to the correct amount of calls.i do it this way so I can
for x = 0 to num_of_names
string = lst_name(x) & "-" & lst_count(x)
next x
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Aug 12, 2009
I'm trying to compute 100! and there doesn't seem to be a built-in factorial function. So, I've written:
Protected Sub ComputeFactorial(ByVal n As ULong)
Dim factorial As ULong = 1
Dim i As Integer
For i = 1 To n
[code]....
Unfortunately, running this with the value of 100 for n rseults in
Value was either too large or too small for a UInt64.
So, is there a larger data type for holding numbers? Am i mistaken in my methods?
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May 8, 2012
I love to experiment with linqpad, but now my task requires heavy computing power. Trying to do it on my computer is painful. My friend has a much more powerful computer than I -- can I execute some operations from my linqpad on his computer? I don't have RDP access, but I can run any .NET program on his computer.
If it is not possible, then is there any FREE service that provides computing power? Maybe a hosting trial or something. I know that Windows Azure offers a 30-day trial, but it has a very slow CPU module and in my country, MS partners cannot be expected to fix service sites when they go down.
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Feb 19, 2009
I need to compute the percentage of games won and games lost. I keep getting errors and it's driving me up a wall. I've changed my code so many times that I don't really remember what it was like when I started.
Private Sub btnPercentage_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnPercentage.Click
Dim team As String
[Code].....
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Jun 14, 2010
How would you take a numerical input from 10 text boxes and total it up and send it to a label. Then average the 10 numeric text boxes and send it to its own label. I am not asking for any code, I just need a hint or two to jog my memory. If this is not clear for you, I'll provide more detail.
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Oct 16, 2010
I am using SQL EXPRESS EDITION 2005 and Created mdf data file using vb.net 2008. now i want to use this datafile in lan. i modified connection string "Data Source=.SQLEXPRESS;AttachDbFilename=ServerDataData1.mdf;Integrated Security=True;User Instance=True;Connect Timeout=60"it is showing security info error i want to use single database file for my application please help me with connection string. thank you
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May 26, 2010
i am trying to make a robot that i can talk to(not yet) and tell it to goto places 1st task it to figure out how to use an inbuilt webcam in my net book and do an image Recognition for walls stars eg 2nd task is to see if i can get it to use my server to help compute the images because my net book is very slow 3rd is speech to text now can all of these be done in vb.net?
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May 20, 2010
I know how to check whether an item exists in a list using (MyList.Contains), But I do not know how to check the whole list. For example (use one button and one richtextbox):
[Code]...
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Mar 6, 2011
I have been given the prep material for my AS Level (Year 12) computer programming exam based around dice cricket. Written in VB 2008.
In the exam we are supposed to change bits based upon the scenario. The scenario and skeleton code are attached.
I have looked through the code so far and made some guesses to what I think may be on the test:
[code...]
if there is anything I am missing which they think I could be asked on the test. I then have to go away and figure out how to program.
So by asking on here, I am not trying to find out coding answers - I do want to figure that out myself. I just want to see if there is anything else I possibly could be asked?
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May 31, 2011
I am trying to write code to compute the Efield on a point P in both the x and y direction, from a charged ring. double y_eField = (_ke_value * _dq * (Sin_angle) / (Math.Pow(r, r)));Problem I am having is the code seems to follow the equation as given but the result it outputs is not correct at all.
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Oct 24, 2009
I have just started coding my Computing project for my A-Level, and I will admit, I am far more experienced in VB6 than VB.NET (as embarrassing as that is to say).I get extra marks for making everything presentable, so was wondering if it was possible to add icons into .NET buttons. For example if I have a button to add an entry to the database, I want a nice Web 2.0 looking icon (for which I already have) next to the text on that button.
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Dec 7, 2009
I have a server that runs a thread that computes some data through function X. Then I have a client that communicates with the server and gets results from function Y. Now, both function (X and Y) share a common variable lets say varZ. When function X populates varZ when the thread starts on the server, the results are not propagated on function Y when accessed by the client through Remoting. But on the server side the results are correct in function Y! It's almost like when client calls function Y, it has no idea what is happening varZ is as far as the value set by function X thread in the server.
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Jul 7, 2010
trying to understand DataGridView. I can sum columns with no problems and place the result in a textbox. My problem is multipling two column rows and saving it. I receive the following error when I go to save it. "Column mapping from source column failed because the data column is a computed column. So can I compute two column row to a third and save it, if so how. My code is below:
I save.[code....]
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Nov 24, 2010
i made application for computing totient function but it doesn't give me any result this is a code Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
[Code]...
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Jan 12, 2010
i made application for computing totient functionbut it doesn't give me any result
this is a code
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
[code]......
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Feb 4, 2010
I'm struggling with making a log in form on vb.net for my A2 computing coursework.
Public Class DbConn
Dim connection As OleDbConnection
Dim cmd As OleDbCommand
Dim dataReader As OleDbDataReader
[code].....
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May 9, 2010
In VB6 I load a recordset containg all of the records (6 fields per record)in a table into an XArray and then manipulate the records in the array and then write them back to the original table. The array issorted by the first field (1 to maybe 8000 or more) I need to find records in the array by an ID field and then move them (because of some external criteria that happens many times) from say number 400 to number 375. Then all of the other records between 375 and 399 were renumbered up 1 to fill the gaps left by the move.
The XArray worked well as it could find and also move to a next record easily to facilitate the revisions to each record quickly. Everything is done in VB6 in code and nothing visual needs to be shown to the user until say 2000 of these external changes are complete. What is the best, most efficient way to do this in the .Net framework in VB2010. Datasets, Dataviews. tableadapters, arrays. enums ?
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Dec 10, 2009
My assignment is to have a user enter in big integers using what i think is two parallel arrays. I got this far but now im stuck. I think i need to actually convert the text box input into an array but i do not know how to do that. I am all over the place in this project.
'Created/ Revised by: Jessica Falcetta
'Cap 204 Final Project: Big Integer Project
'Project Purpose: To calculate large integers through parallel arrays
[CODE]...
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Feb 2, 2010
I have a VB.net console app and I am opening a function in a dll written in fortran. I am passing 3 arrays through the function by reference. When they come back out the otherside they ahve all tunred to arrays of only one element And that element is 0.I read on the internet somewhere that when doing this kind of thing it is a good idea to only pass the first element of the array into the function.I tried changing my function declaration to accepting single elements rather than single dimensional arrays, and now the arrays are the same length before and after the function call, but they don't seem to be changing at all, so i'm not sure that this is working
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