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• Disk Search / Sort Algorithm

  - by AlgoMan

  Given a Range of numbers say 1 to 10,000, Input is in random order. Constraint: At any point only 1000 numbers can be loaded to memory. Assumption: Assuming unique numbers. I propose the following efficient , "When-Required-sort Algorithm". We write the numbers into files which are designated to hold particular range of numbers. For example, File1 will have 0 - 999 , File2 will have 1000 - 1999 and so on in random order. If a particular number which is say "2535" is being searched for then we know that the number is in the file3 (Binary search over range to find the file). Then file3 is loaded to memory and sorted using say Quick sort (which is optimized to add insertion sort when the array size is small ) and then we search the number in this sorted array using Binary search. And when search is done we write back the sorted file. So in long run all the numbers will be sorted. Please comment on this proposal.

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• How to sort hashmap?

  - by agazerboy

  Hi All ! I have hashmap and its keys are like "folder/1.txt,folder/2.txt,folder/3.txt" and value has these text files data. Now i am stucked. I want to sort this list. But it does not let me do it :( Here is my hashmap data type: HashMap<String, ArrayList<String>> following function work good but it is for arraylist not for hashmap. Collections.sort(values, Collections.reverseOrder()); I also tried MapTree but it also didn't work, or may be I couldn't make it work. I used following steps to sort the code with maptree HashMap testMap = new HashMap(); Map sortedMap = new TreeMap(testMap); any other way to do it?? I have one doubt as my keys are (folder/1.txt, folder/2.txt ) may be that's why?

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• JTable's and DefaultTableModel's row indexes lose their synchronization after I sort JTable

  - by Stefanos Kargas

  JAVA NETBEANS // resultsTable, myModel JTable resultsTable; DefaultTableModel myModel; //javax.swing.table.DefaultTableModel myModel = (DefaultTableModel) resultsTable.getModel(); // event of clicking on item of table String value = (String) myModel.getValueAt(resultsTable.getSelectedRow(), columnIndex) I use JTable and DefaultTableModel to view a table of various info and I want to get a value of a certain column of the selected index of the table. The code I wrote above works fine except when: I use the sort of the GUI (click on the field name I want to sort on the table) The table is properly sorted but after that when I select a row, it gets the value of the row that was there before the sort. This means that after sorting (using the JTable's GUI) the 'myModel' and 'resultsTable' objects have different row indexes. How do I synchronize those two?

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• Custom array sort in perl

  - by ABach

  I have a perl array of to-do tasks that looks like this: @todos = ( "1 (A) Complete online final @evm4700 t:2010-06-02", "3 Write thank-you t:2010-06-10", "4 (B) Clean t:2010-05-30", "5 Donate to LSF t:2010-06-02", "6 (A) t:2010-05-30 Pick up dry cleaning", "2 (C) Call Chris Johnson t:2010-06-01" ); That first number is the task's ID. If a task has ([A-Z]) next to, that defines the task's priority. What I want to do is sort the tasks array in a way that places the prioritized items first (and in order): @todos = ( "1 (A) Complete online final @evm4700 t:2010-06-02", "6 (A) t:2010-05-30 Pick up dry cleaning", "4 (B) Clean t:2010-05-30", "2 (C) Call Chris Johnson t:2010-06-01" "3 Write thank-you t:2010-06-10", "5 Donate to LSF t:2010-06-02", ); I cannot use a regular sort() because of those IDs next to the tasks, so I'm assuming that some sort of customized sorting subroutine is needed. However, my knowledge of how to do this efficiently in perl is minimal. Thanks, all.

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• Sort an array by a child array's value

  - by Evan

  I have an array composed of arrays. I want to sort the parent array by a property of the child arrays. Here's an example array(2) { [0]=> array(3) { [0]=> string(6) "105945" [1]=> string(10) "First name" [2]=> float(0.080878465391) } [1]=> array(3) { [0]=> string(6) "109145" [1]=> string(11) "Second name" [2]=> float(0.0504154818384) } I would like to sort the parent array by [2] ascending in the child arrays, so in this case the result would be the child arrays reversed (.05, 08). Is this possible using any of the numerous PHP sort functions?

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• php - sort the unsorted text file and rewrite to same text file in sorted order

  - by arrgggg

  Hi, I have a question. I am in process of learning how to read/write files, but having little trouble trying to do both at the same time in same php script. I have a text file with words like this, Richmond,Virginia Seattle,Washington Los Angeles,California Dallas,Texas Jacksonville,Florida I wrote a code to sort them in order and this will display in sort order by City. <?php $file = file("states.txt"); sort($file); for($i=0; $i<count($file); $i++) { $states = explode(",", $file[$i]); echo $states[0], $states[1],"<br />"; } ?> From this, how can I rewrite those sorted information back into the states.txt file? Thanks for your help.

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• ASP.NET - Overriding Gridview OnRowCreated to add sort images -- columns are null

  - by Zach

  I'm overriding the onrowcreated to add sort images to the header row of a gridview. This works, but actually adding a sortexpression doesn't. What I want to do is set the images as imagebuttons and set their commandarguments to the sort expression of the column they are sorting for. I would assume I could get the cell and from it's index get the gridviewcolumn. Then, I could just get the sortexpression of the gridview column, but this does not work. The columns are null. OnRowCreated Code snippet below: //if this is the header row, we add sort images to each cell if (row.RowType == DataControlRowType.Header) { //iterate through the cells for (int i = 0; i < row.Cells.Count; i++) { //if the column is sortable and visible if (this.Columns[i].SortExpression != string.Empty && this.Columns[i].Visible) { string strSort = this.Columns[i].SortExpression; } } } Can we not get columns in OnRowCreated like this?

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• OS X contains heapsort in stdlib.h which conflicts with heapsort in sort library

  - by CryptoQuick

  I'm using Ariel Faigon's sort library, found here: http://www.yendor.com/programming/sort/ I was able to get all my code working on Linux, but unfortunately, when trying to compile with GCC on Mac, its default stdlib.h contains another heapsort, which unfortunately results in a conflicting types error. Here's the man page for Apple heapsort: http://developer.apple.com/library/mac/#documentation/Darwin/Reference/ManPages/man3/heapsort.3.html Commenting out the heapsort in the sort library header causes a whole heap of problems. (pardon the pun) I also briefly thought of commenting out my use of stdlib.h, but I use malloc and realloc, so that won't work at all. Any ideas?

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• How to sort a gridview once a radio button is selected

  - by metashockwave

  I'm trying to sort records in the gridview right after a radio button is selected. My approach is with the dataview, but because the dataset variable doesn't survive a round trip to the server, I don't know how to make this happen. please help! Public Sub GetCustomers() db.RunProcedure("usp_customers_get_all") db.doSort(radList.SelectedValue) gvCustomers.DataSource = db.MyView End Sub Protected Sub radList_SelectedIndexChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles radList.SelectedIndexChanged If radList.SelectedValue = 0 Then db.doSort(0) gvCustomers.DataSource = db.MyView End If If radList.SelectedValue = 1 Then db.doSort(1) gvCustomers.DataSource = db.MyView End If End Sub Public Sub doSort(ByVal strIn As Integer) If strIn = 0 Then MyView.Sort = "lastname, firstname" Else MyView.Sort = "username" End If End Sub Public Sub RunProcedure(ByVal strName As String) Dim objConnection As New SqlConnection(mstrConnection) Dim mdbDataAdapter As New SqlDataAdapter(strName, objConnection) Try mdbDataAdapter.SelectCommand.CommandType = CommandType.StoredProcedure Me.mDataset.Clear() mdbDataAdapter.Fill(mDataset, "tblCustomers") MyView.Table = mDataset.Tables("tblCustomers") Catch ex As Exception Throw New Exception("stored procedure is " & strName.ToString & " error is " & ex.Message) End Try End Sub

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• XSLT Sort Alphabetically & Numerically Problem

  - by Bryan

  I have a group of strings ie g:lines = '9,1,306,LUCY,G,89' I need the output to be: 1,9,89,306,G,LUCY This is my current code: <xsl:for-each select="$all_alerts[g:problem!='normal_service'][g:service='bus']"> <xsl:sort select="g:line"/> <xsl:sort select="number(g:line)" data-type="number"/> <xsl:value-of select="normalize-space(g:line)" /><xsl:text/> <xsl:if test="position()!=last()"><xsl:text>,&#160;</xsl:text></xsl:if> </xsl:for-each> I can get it to only display '1, 12, 306, 38, 9, G, LUCY' because the 2nd sort isn't being picked up. Anyone able help me out?

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• Batch INSYNC help needed...

  - by Raja Reddy

  I have a INSYNC batch to 'extract' certain conditioned data output. For instance, below insync code extracts the data if 44 pos has a value of '25'. Question here is, I wanna get the output in a sorted manner based on a particular field. Can we incorporate the SORT criteria below. Suggestions are really appreciated. FUNCTION=EXTRACT INDD=#INDD OUTDD=#OUTDD RDW=OFF LINESPERPAGE=080 CASE SEARCHDATA=(00044,002,EQ,C'25') ENDCASE PS: We can achieve the same by means of SORT utility through 'SORT FIELDS' parameter.

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• How to Sort List Collection

  - by Muhammad Akhtar

  I have class like public class ProgressBars { public ProgressBars() { } private Int32 _ID; private Int32 _Name; public virtual Int32 ID {get { return _ID; } set { _ID = value; } } public virtual Int32 Name { get { return _Name; } set { _Name = value; }} } here is List collection List<ProgressBars> progress; progress.Sort //I need to get sort here by Name how can I sort this collection? Thanks

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• How to Sort Typed List Collection

  - by Muhammad Akhtar

  I have class like public class ProgressBars { public ProgressBars() { } private Int32 _ID; private string _Name; public virtual Int32 ID {get { return _ID; } set { _ID = value; } } public virtual string Name { get { return _Name; } set { _Name = value; }} } here is List collection List<ProgressBars> progress; progress.Sort //I need to get sort here by Name how can I sort this collection by Name? Thanks

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• Sort files by name in Java differs from Windows Explorer

  - by Martyn Hopkins

  I have a simple Java program which reads a file directory and outputs a file list. I sort the files by name: String [] files = dirlist.list(); files = sort(files); My problem is that it sorts by name in a different way than Windows Explorer does. For instance if I have these files: abc1.doc, abc12.doc, abc2.doc. Java will sort like this: abc1.doc abc12.doc abc2.doc When I open the folder in Explorer, my files are sorted like this: abc1.doc abc2.doc abc12.doc How can I make Java sorts my files like in Windows Explorer? Is this a Windows trick?

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• Sort a 2D Points List (first by X and then Y)

  - by Mikos

  I am trying to sort a List of 2D Points first by x co-ordinate and then by y co-ordinate. I implemented the IComparer interface as follows: class PointComparer : IComparer<Point> { public int Compare(Point x, Point y) { if (x.Y != y.Y) { return x.Y - y.Y; } else { return x.X - y.X; } } } And then call my sorting as follows: pointsList.Sort(new PointComparer()); For some reason the list doesn't sort. Surely is something very simple and silly, but stuck on this for quite a while....TIA

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• Progressbar: Force element.innerHTML update before javascript sort call

  - by maras

  Hi, what is the best practice for this scenario: 1) User clicks "Sort huge javascript array" 2) Browser shows "Sorting..." through element.innerHTML="Sorting" 3) Browser sorts huge javascript array (100% CPU for several seconds) while displaying "Sorting..." message. 4) Browser shows result. Pseudo code: ... <a href="#" onclick="sortHugeArray();return false">Sort huge array</a> ... function sortHugeArray(){ document.getElementById("progress").innerHTML="Sorting..."; ...do huge sort ... ...render result... document.getElementById("progress").innerHTML=result; } When i do that this way, browser never shows "Sorting...", it freezes browser for several seconds and shows result without noticing user... Thank you for advice.

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• PHP sorting an array by mysql date.

  - by daviemanchester

  Hi I have an array that I would like to sort using a date field from a mysql database. Here is a sample of the array which is named 'news' in my class: [48] => Array ( [id] => 14 [type] => 3 [updated] => 2010-04-17 13:54:42 ) [49] => Array ( [id] => 15 [type] => 3 [updated] => 2010-04-17 13:57:21 ) I want to sort de by the 'updated' field. I have some code I have started but am unsure how to complete it and get it working. function sortNews($x) { usort($this->news, array("ProcessClass", "cmp")); //correct sort type? } function cmp($a, $b) { ...................................... missing code } Can anyone help??

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• Sorting in Matlab

  - by smichak

  Hi, I would like to sort elements in a comma-separated list. The elements in the list are structs and I would like the list to be sorted according to one of the fields in the struct. For example, given the following code: L = {struct('obs', [1 2 3 4], 'n', 4), struct('obs', [6 7 5 3], 'n', 2)}; I would want to have a way to sort L by the field 'n'. Matlab's sort function only works on matrices or arrays and on lists of strings (not even lists of numbers). Any ideas on how that may be achieved? Thanks, Micha

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• sort a list of objects based on runtime property

  - by jijo

  I have an arraylist of VOs. These objects have many properties and corresponding get/set methods. I want to sort this array list based on a property which I'll be getting in runtime. Let me explain in detail. My VO is like this public class Employee { String name; String id; private String getName() { return name; } private String getId() { return id; } } I will be getting a string ‘sort’ in runtime, which can be either ‘id’ of ‘name’. I want to sort the list based on the value of the string. I have tried to use comparator and reflection together, but no luck. I don’t want to use an if loop and create new comparator classes. Any other thoughts?

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• sort std::list case sensitive elements

  - by Dave18

  #include <list> #include <string> using std::string; using std::list; int main() { list <string> list_; list_.push_back("C"); list_.push_back("a"); list_.push_back("b"); list_.sort(); } does sort() function sort the elements according to their character codes? I want the result here to be a b C after the sorting is done.

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• jQuery/Tablesorter: maintain secondary alphabetical sort

  - by user460847

  I have a table of names and ages that I want the user to be able to sort. When the page initally loads, sortList lists the rows in order from oldest to youngest, and then secondarily from A to Z. I want the same thing (a SECONDARY alphabetical sort) when the user actually clicks on the age <th>, but sortForce is making the alphabetical sort primary. Is there an alternative? $('#super_results table').tablesorter({ sortForce: [[0,0]], sortList: [[1,1],[0,0]] }); Or am I misunderstanding sortForce? Documentation here.

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• Turning a log file into a sort of circular buffer

  - by pachanga

  Folks, is there a *nix solution which would make the log file act as a circular buffer? For example, I'd like log files to store maximum 1Gb of data and discard the older entries once the limit is reached. Is it possible at all? I believe in order to achieve that a log file should be turned into some sort of special device... P.S. I'm aware of misc logrotating tools but this is not what I need. Logrotating requires lots of IO, happens usually once a day while I need a "runtime" solution.

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• Excel wizardness needed - Group By, Sort, Count function help

  - by Chris

  Riddle me this: You have 3 part numbers with the same part name xyz, each with a quantity of 10 items. The items can be picked during the day or week, therefore changing the amount of items on hand. I know I need to use the group by, sort, count and perhaps sumif formulas to have a running count of the number of items on hand at the end of each day (which could be positive or negative). Help? it wont let me add an image because i'm a new user. 'Oops! Your edit couldn't be submitted because: * we're sorry, but as a spam prevention mechanism, new users aren't allowed to post images. Earn more than 10 reputation to post images. '

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• Default sort order in Windows folder

  - by Florian Müller

  I am running Windows 7 and I have a folder "Dropbox" inside my Documents folder. However, every time I restart Explorer and enter this folder, it is sorted by mutation date. I'd like to have it default sorted by name, which is still default in all other folders, however not in this one. Please let me know if there is a way to define this properly! Thanks in advance! Note: I actually found out that this is in every folder or library now, not only in some folders. This is the standard sort behaviour when I open explorer the first time.

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• Perl :how to sort dates in perl

  - by kiruthika

  Hi, How can I sort the dates in perl. my @dates = ( "02/11/2009" , "12/20/2001" , "11/21/2010" ) ; I have above dates in my array . How can I sort those dates... ? My date format is dd/mm/YYYY.

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