How To Get Random Items From Array
Aug 26, 2010
I have an array with 280 items in it. I only want 140 of those, so I want to pick them at random. So I need to generate a random number between 0 and the source array's getupperbound property. I think. Is there a more suitable way to pluck an item from an array. I wonder if there's a way to ensure that you don't choose the same item more than once. I suppose I could randomly sort the source array and choose the first 140 items, that would ensure I don't get a repeat item. But could be inefficient if the source array is much larger than the destination array, because I'd be shuffling more values than I need to shuffle. I suppose it's a sampling problem.
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Dec 20, 2010
I'm working on a program that will randomly select a loadout(weapon, perks, etc), but the user enters their current level to get the loadout. This is important because certain guns unlock at certain levels, so i don't want someone getting something they can't use.
I'm not sure what the best way of approaching this is. All i can think of is either getting a random item, checking if the user's level is high enough then if it's not high enough do it again.
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Apr 20, 2012
I am wondering how i would go about taking multiple items (randomly) from a listbox and displaying them in a label!Now this listbox wouldn't have to be visible, maybe i can do it without it even being a listbox?I want to have 25 labels and each one recalls a random value from the list (doesnt matter about being unique and the list will contain about 20-30 items)Im just a bit stumped on how to do it as ive done some looking into it but most people are asking for randomized numbers or unique items where as i need randomized items from a list which aren't unique!
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Mar 12, 2010
so I am working on a program with items entered into a listbox. Then when the user clicks a button it will randomize the listbox items in just a random order obviously. I have tried adding it to an array and everything but I ended up just having to start over now because I couldn't find a solution. I can save the contents and everything I know how to do that it's just randomizing the items that I am struggling with. I have searched high and low and have yet to find a conclusion to my problem.
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Sep 21, 2011
how to go about picking the random weapons. When you generate a random class, the user must first enter their current rank (level). This is because you are unable to use certain guns until you reach a specified level. This keeps the program from giving out guns the user can't use. What I am doing is allowing the user to give certain parameters as to what type of gun they want to use (or don't want to use). For example, I have checkboxes for the user to pick if they want assault rifles, SMGs, LMGs, Snipers, Shotguns, RPG, etc.
I did this in another version of this program I made, but the only option was to pick whether or not you wanted RPGs included. So, it was easy enough to check if the weapon was an RPG and if it was simply generate another random weapon. I could do this, but with the number of options there are, I don't think this would be the best solution.
[Code]...
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Jul 30, 2009
Random name for each item in listbox2(which copies the items from listbox1)
[CODE]:...................
You can see i almost got the code, but i dont know how to rename!
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Jun 8, 2011
i want to make program for a quiz.i create the questions is an array,and i want that questions start at random, and never be shown again.
[Code]...
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Mar 28, 2010
I have a listbox were users can add items to. Then i also have a remove button which removes the selected item. The listbox also has a datasource, so to remove an item i uses this
[code]...
But i also want sorting on the listbox. But when i clicks the remove button, it removes random items, not the selected one. How can i fix this?
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Aug 3, 2011
Im creating a program that randoms 5 questions and when a certain question is shown then it must not be shown again when the button is clicked. Lets say when "What is my name?"array is shown when the button is clicked then it must not be shown again until the last question that is not shown will be shown.
Public Class Form1
Dim random As New Random
Dim Question() As String = New String(5) {}
[code]....
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Mar 1, 2009
Im having some problems with displaying a random image into a picturebox now i have to form on Form1 i have a button code..
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim intPic As Integer
Dim rand As New Random
Dim ImageList As New ArrayList
[Code]...
Its one of them yellow highlight errors as i cant see anything wrong with this code could someone
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Feb 22, 2011
How Can I random the numbers in my array but they will not repeat the array value. The array number starts from 11 to 14.
Or how can I random 4 buttons.text that uses array to call their text?
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Apr 19, 2011
I have not messed with VB much and I have been trying to do something that has me stumped. I wanted to create an array of 10 random numbers. Each of these numbers then is printed onto a label. From here I have two more labels that show the highest and lowest value. I got the first part, 10 random numbers show up but then things get shaky. This is what I have thus far.
[Code]...
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Oct 29, 2011
i want creat a simple game. but how to create a random value to index in array
i.e index of aray [1,2,3,4,5,6,7,8] is generated randomly become [8,6,1,5,4,2,3]
then i use tha indext for a button text
"and anyone can make below code more simple"
Button1.Text = arr_tombol(1).ToString
Button2.Text = arr_tombol(2).ToString
Button3.Text = arr_tombol(3).ToString
[Code].....
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Feb 3, 2011
Generating random numbers in an array HELP
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Feb 10, 2010
i want to get a random number from an integer array, then delete that number in that array.for example, i have an array like this {1,2,3,4,5,6,7,8,9}now i want to get a RANDOM number in that array ( the number must be in the array), 8 for example. And then delete it from the array.
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Nov 4, 2009
i have some arrays called ques(1 to 10) what i want to do is to use a random number generator then make my each of my arrays equal to it
eg
ques(4)
ques(7)
ques(2)
ques(9)
ques(1)
ques(6)
etc
i want it to randomly insert the numbers into the arrays but also make sur that each number is not repeated
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Jul 16, 2009
how I pick a random item from a array?Here's the little bit of code I got:
Dim array() As String
Dim words As String
words = "hello*123*abc*zxw"
array = Split(words, "*")
But what should I do next to randomly select a item from "array"?
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Nov 9, 2010
The first problem I am having is that it populates every cell with the same random number. How do I get it to create a new random number? The second problem is that I need to make sure each entry in the array is unique.
[Code]...
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Feb 11, 2007
I'm wanting to put a random amount of data into an array, or an arrayList or some other collection.
Then say>
Dim myItem As Object 'It might be a string or a number or whatever. In this case
Integer or String probably.
' then say>>
[Code].....
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Mar 2, 2009
I'm trying to generate a list of random points of a 2d array.
ie
(1,0)
(2,1)
(1,2)
(0,0)
(0,1)
....
I need to process each array location, but I would like it to be in a random order.
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Sep 7, 2010
I am working on a 1st grade math program for schools in the Dominican Republic. What I am ttrying to do is have an array of farm animals. The question on the form is "How many letters are in the word " ". The " " is a textbox. All this will start when the click on a picture of a clock. A timer will also start, but I have that part done.
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Nov 30, 2011
How would you select a random word from an array list. Here is my coding:
'Create a sub which reads the words from the file and selects a random word.
Sub ReadWordsFromFile(ByVal fileName As String, ByRef RandomWord As String)
'Create a random number generator.
Dim RandomNumber As New Random
Dim words As New ArrayList
[Code]...
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Sep 21, 2011
So I know how to an unique random number in a 1D array but In an 2D array looks so difficult or strange for me[code]...
Is their an other solution for an unique random number 2D array?
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Aug 7, 2011
I am trying to create an array of 5 random unique numbers between 1 and 30. I've been trying for a while and have had no luck.
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Feb 22, 2010
I want to create an array V0(9) using random number generation. For example I generated V0(9) = {1,2,3,4,5,6,7,8,9,1} I want to use 12345 + 67891. How can I separate to use two parts of the array.
My
Public Class Form1
Dim i As Integer
Dim V0(9) As Double
[Code].....
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Nov 7, 2010
I have an array of 26 strings from A to Z. Then, I am creating a random list of 7 alphabets from this array. Now I want the user to pick first 2 alphabets manually and then on a click it will display the rest 5 randomly generated after subtracting first 2 picked ones from the whole 26 alphabets array. how this can be achieved in lists.
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Mar 10, 2010
I try to generate 10 random integers and store it in an array(9). Then I split the array into half by converting it into string. My code can compile but it sometimes work and most time cannot work. I don't know what is the problem....
Public Class Form1
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
[Code]......
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Dec 12, 2009
I'm trying to make a Bulls and Cows type game, I was able to do it fairly easily with javaScript, but VB is killing me. I can get the array 5 slots long with random numbers, unfortunately they're all repeats. when I try getting no repeats I run into infinite loops, exponentially increasing array lengths, and just plain old arrays with 5 numbers randomly generated, but with repeats.
I'm trying to do this with loops, in JS I did it using regular expressions
Here's an example of my code.
Public Class Form1
Dim intRand(0) As Integer
Dim RandomClass As New Random
[Code]....
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Nov 2, 2009
For my assignment I have to tell the largest and smallest number in a label, and the numbers are generated randomly in this code:
Dim intNumbers(14) As String
Dim intCounter As Integer
Private Sub btnGenerate_Click(ByVal sender As System.Object, ByVal e As System.EventArgs)
[code]....
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Dec 6, 2009
I am writing a program for a class on visual basic and i have a listbox that displays 15 random numbers using an array. Then there are 2 buttons(max and min) that when clicked displays the largest number in the list and the smallest. how do i get these buttons to do this?
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