.net - Performance-comparison Of Sort() And BinarySearch() With Integers/Strings?
Nov 15, 2010
Originally i wanted to ask if it's faster to sort Integers than Strings.But i have answered this question myself and i'm suprised of the big difference.Why is sorting and BinarySearch Integers as much faster compared to Strings?
The (VB.Net) Test with 1.000.000 Int32/Strings:
Private Function CheckIntBinarySearch() As TimeSpan
Dim watch As New System.Diagnostics.Stopwatch()
Dim rnd As New Random(Date.Now.Millisecond)
Dim intCol1 As New List(Of Int32)
[code]....
Consider having large collections of "String-Integers"("1","2","3",...). Would it even be better to parse them to integers before sorting and searching them? What is the cost of parsing Strings to integers?
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Aug 25, 2010
I have a windows app and I'm trying to cache images in memory. I have:-
[code]...
I think I have to sort the array to be able to use binarysearch.So I need to sort the arraylist on TileDetails.TileURL(if possible) and then binarysearch on it.
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Aug 13, 2009
I am working on a UDP Client/Server, and currently i have them sending back and forth strings, which i convert to bytes, and then open the bytes to read. I want to now send an Object instead of those strings, which includes multiple unsigned integers and strings.
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Apr 19, 2009
I need to sort an array containing a list of words and search the same using binarysearch. For certain reasons, the word-list must always be sorted using the sorting-rules of "en-US" i.e. American Regional Settings. The code will run under various international Operating Systems and of course this will mean that the word-list will be sorted differently according to the local Regional Settings in use. One problem could arise on a computer/device running with Lithuanian Regional Settings. Why? Because the letter "Y" in most languages is sorted like X-Y-Z while in Lithuanian, the sort order is I-Y-J. This behavior would create havoc to my program.
[Code]...
However, in means of flexibility I believe Guffa's answer is the best one. Why? Let's use another example:In German, the letter Ö is sorted Ö-X-Z while in Swedish and Finnish, the order is X-Z-Ö. In Estonian the sort order is Z-Ö-X. Complicated, isn't it? Guffa's solution will let me force Swedish sorting-oder (changing CultureInfo) on a device running under German Regional settings. Using Comparer.DefaultInvariant with its association to English wouldn't help in this case, probably the letter Ö would end up with O. Therefore my vote will go to Guffa.
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Oct 12, 2011
I'm trying to sort items in a ListBox in a WPF project in VB 2010. I tried searching the web but I couldn't find a code that works (maybe I'm doing something wrong). Here's what happens everytime the user clicks on the button The timer "Generator" is fired The code in Generator_Tick make 6 random numbers (no duplicates), and adds them to ListBox1 Here I want the Items in ListBox1 sorted so Every item in ListBox1 is added to TextBox1 (in the order in which they are in ListBox1)This is just a test project so I didn't give the components a name):
Here's my code:
Private Sub Generator_Tick()
Do While ListBox1.Items.Count < 6
Randomize()
Dim Combination As Integer = Int(Rnd() * 30) + 1
[code].....
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Jan 3, 2012
I am working on a desktop application in VB.Net (4.0) There will a lot of SQL scripts which contains a lot of insert queries Currenlty we are running the scripts using SMO (http://msdn.microsoft.com/en-us/library/ms162557.aspx)For performance, we have planned to change the sql scripts to xml file ( instead of insert queries, it will have xml data with a proper xsd defined )Loads xml to dataSet and Using SQL Bulk Copy we are trying to insert to SQL Server.
[Code]...
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Apr 22, 2010
I want to sort my numbers(integers) in a ListBox. [code] I tryed to add a "0" string before the achual integer, [code]
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Feb 10, 2011
I suspect there is something wrong in my application, specifically in a part where I have to compare a couple strings and a couple integers.
I do something like this:
If myString = myOtherString Then
do something
End If
And the same thing for integers.
However, for some reason, it is not returning true... also, I heard somewhere there were more proper ways to compare strings and integers.
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Apr 6, 2009
I'm trying to split an inputted string (txtStart.text) into separate integers. The split function works fine for me, but I can't figure out how to store the each part of the array... This is my current code that I based on an example from MSDN library:
Private Sub btnGo_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnGo.Click
SplitStringIntoWords()
End Sub[code]......
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Jul 10, 2010
if i have 2 textboxes and i want to do subtraction with textbox1 and textbox2.
The value inside textbox1 is "5 12 30 8 2"
The value inside textbox2 is "7 9 14 8 3"
May i know what can i do so that the result will be "-2 3 16 0 -1"???
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Jan 16, 2011
I suspect there is something wrong in my application, specifically in a part where I have to compare a couple strings and a couple integers.
[Code]...
However, for some reason, it is not returning true... also, I heard somewhere there were more proper ways to compare strings and integers.
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Jun 18, 2009
In my VB application,I am copying huge amount of data using VB string?This results in performance issue.What shoul I use in place of VB string to improve performance?
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Jul 14, 2011
I am using an oleDb connection to connect to an excel spreadsheet (.xlsx) file and load the information into a datagridview. From there I hope to have it edited by a person and programmatically at runtime. However, I noticed that when I import a file that has integers in a column, it will not import any of the string values in that column. Also, It will not allow me to manually enter strings into that column at runtime - it results in an error stating: [Code]
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Feb 9, 2009
I have a "if This > That then" statement, that doesn't seem to work, as it triggers regardless that "This" is smaller than "that". Does it matter that these variables are marked as strings vs integers?
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Jul 22, 2010
Reading [URL] made me wonder whether the comments in there did apply to Strings in terms of performance. Since strings are copied before being passed, isn't it much more efficient (if the callee doesn't need a copy of string course) to pass strings ByRef?
[Code]...
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Apr 4, 2011
How would I create a list of elements in VB.NET, save it to a .dat file, and make Ruby re-create such list (as an array) with such elements (they will be strings, booleans and integers)?
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Feb 13, 2011
This is my first time posting here although I have been lurking for quite some time. I'm stuck with a problem I have seen before and never solved: I have a long list (~23,000) of alphanumeric strings that I'm reading into a List(of String) from a text file, and then sorting. When I iterate through the list after sorting, it appears to be correctly sorted EXCEPT that the element that was originally at the beginning of the list is now at the end (and it should be somewhere in the middle after the sort)Here is a sample input:
PRE1-PRE2_00015648
PRE1-PRE2_00015649
PRE1-PRE2_00015650
[code].....
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Dec 29, 2009
I have nine always changing values that are strings I need to know how to sort them. I have each of the nine values each on it's on panel. I want to make the panels stack highest value to lowest value. Shot of writing every possibility of combinations and let's say that would take forever.
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Apr 4, 2012
I have an array of strings such as "blue", "green", "red" and I wish to sort them so the longest string comes first and the shortest last.
Currently I am creating another array with the lengths of each string in the array in the same index positions and using this array as the key array to sort by as can be seen below, but I think this could be optimised into one line perhaps?
Dim colours() As string = {"blue", "green", "red"}
Dim colourslength() As Integer
For i As Integer = 0 To colours.Length - 1
[Code].....
Edit: just realised I defined colours as a list in the example code, it's an array in my actual code.
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Jun 6, 2011
I've been working on a small project to sort through multiple text files which have all the same strings. Basically, I am looking to sort through and create a text delimited file for future use. The below script is what I have come up with so far, and have tried several "For Loops" but found that I was lot worse off than working with the "Do"[code]...
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Aug 19, 2009
I have this list
email1@hotmail.com
email2@aol.com
email3@yahoo.com
and I need to sort them like this
email2@aol.com
email1@hotmail.com
email3@yahoo.com
instead of sorting from the first characters from a to z, I want to sort the characters after the "@" symbol in the email.
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May 6, 2010
how to convert an array of strings to an array of integers? I want to convert a string array with 77, all string numbers, to an integer array?
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Mar 20, 2010
I tried coding for an application that will display the positive integers, negative integers and zero entered in a inputBox. for some reason it keeps crashing down.here is my code. paging all visual basic professionals. [code]
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Nov 9, 2010
How do you sort strings with numbers when you want numbers sorted based on their dimension?
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Aug 1, 2009
I need to sort an array. I need the most repeated strings at the start and the least repeated at the end. Any easy way to do this? My brain is currently fried
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Feb 2, 2012
Basically I have and array of integers that vary in size. I need to compare each number to each other number and display which number is repeated. For example:
Dim ints() As Integer = {1,2,2,5,4,6}
The number that shows up more than once is 2.
How can I run through the array and compare each integer with the numbers in the array. I tried a for loop but it didn't return the value I was looking for.
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Oct 28, 2009
I've got my text files read into an array.Which was step 1 .My code so far is:
Note: textSKU is just a text box. No event handler associated.
Private Sub BtnSeacrch_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles BtnSeacrch.Click
Dim objCA As New System.IO.StreamReader(ofdCA.FileName)
System.IO.StreamReader(ofdWarehouse.FileName)[code]....
The message box is mostly just to test to see if it's finding the line. And the problem is it's returning -136.Which I'm pretty sure can't be a value in the array ( actually very sure, as I tested it just to be sure, and it says it's out of bounds).I know it's in the array, as when I change returnvalueCA to a...7 for example, it outputs the correct line from the .csv file.
Edit: Index was outside the bounds of the array. is what the debugger says, as it's trying to output the value of SKUSheet(-136)
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Oct 16, 2009
Say I have a List(Of Tag) with Tag being an object. One member of Tag, Tag.Description, is a string, and I want to make a comma-separated concatenation of the Description members.Is there an easier way to do this than to read the Description members into a List(Of String) and then use the Join function?
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Mar 18, 2011
why this sub show me -3?
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim s As String() = {"0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "10"}
[code].....
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Jan 3, 2011
there are a total of 5 errors with this code.
error 1: Optional parameters must specify a default value - error location "lastEl As object) As Long" - closing bracket is highlighted
Error 2: expression expected - error location "Optional lastEl As Variant) As Long" - where optional is highlighted.
Error 3: comma, ')', or a valid continuation expected - error location "strCycleIDarray As Variant" - where "as" is highlighted
Error 4: comma, ')', or a valid continuation expected - error location "strSearchCycleIDvalueArray As Variant" - where "as" is highlighted
Error 5: Ismissing is not declared and may not be accessible due to its protection level - error location "If IsMissing(lastEl) Then lastEl = UBound(strCycleIDarray)" - where "IsMissing" is Highlighted.
I dont have an idea where to start solving these errors and i cant debug this search as the errors are there.If you dont understand the errors in the format i have put them in just copy and paste the code into a windows form using a button as an activiator.
[code]....
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