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  • OpenCV SVD Matrix format.

    - by Rick
    I currently have a set of 2D Cartesian coordinates e.g. {(1,3), (2,2), (3,4)} Which will be put into a 2D array, to perform SVD properly would the matrix be put together such that the coordinates form the columns or the rows e.g. 1 3 2 2 3 4 or 1 2 3 3 2 4 I have been doing a little trial and error comparing to examples of SVD I have found online, the resulting matrix usually seems to be negated, with some of the values shuffled around. To clarify further if I had a matrix E which was MxN as shown here http://upload.wikimedia.org/wikipedia/commons/b/bb/Matrix.svg To define the matrix as a 2D array would it be Array[M][N] or Array[N][M] I am assuming this actually matters due to matrix arithmetic not being commutative? Can anyone actually verify this?

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  • CheckboxList not setting Selected with Viewstate

    - by Earlz
    I have a CheckboxList that seems to load and do everything right, except for when I do a postback, it will not have the Item.Selected property set. I have viewstate disabled for the entire page. I load it like so(inside Page_Load on every load): foreach (DataRow service in d.Tables[0].Rows) { cblServices.Items.Add(new ListItem((string)service["description"], service["id"].ToString())); } My markup is simple: <asp:CheckBoxList runat="server" ID="cblServices" Width="300px"></asp:CheckBoxList> and then, I use basically something like this(in a _Click serverside event for a button) foreach(ListItem item in cblServices.Items){ if(item.Selected){ MyLabel.Text+="selected: "+item.Value+item.Text; } } and MyLabel never has any text added to it. I can verify with the debugger that it does reach the _Click's foreach loop, but no item is ever selected. What could be the cause of this?

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  • Stop a postback in javascript

    - by jmpena
    hello, i have an ASP webform with a JQuery Thickbox, i have an image that opens the thickbox when user click. once open the thickbox it shows me a grid with several rows and a button to select one and after the user select the record it returns to the main page the recordselected and cause a __doPostBack() BUT! sometimes in IE6 it stay loading the postback and never ends i have to refresh the page and when it refresh it shows everything fine. but i dont want the postback stay loading AND it does not happend always. i have to call a __doPostBack because i need to find info related to the selected record. thanks.

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  • cakePHP - ACL tutorial & SQL Error: 1104

    - by vector
    Greetings! I run into a problem/bug in production environment with SQL Error: 1104 when deploying a project secured with the ACL tutorial. The full error: SQL Error: 1104: The SELECT would examine more than MAX_JOIN_SIZE rows; check your WHERE and use SET SQL_BIG_SELECTS=1 or SET SQL_MAX_JOIN_SIZE=# if the SELECT is okay [CORE/cake/libs/model/datasources/dbo_source.php, line 666] I've build a small site, worked through the ACL tutorial from the official cake book and locally everything is spiffy. dev. setup consists of: XAMPP: myslq 5.1.33, php 5.3 cakePHP 1.2.7 prod. setup: mysql 5.0.33 php 5.2.2 One of the differences I noticed with mysql setup between local and production servers, is that SQL_BIG_SELECTS is disabled on the production server ( and I don't have privileges to change that, posted a support ticked, didn't hear anything yet) Is there anything I can do about this from my end? Thanks in advance.

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  • More pythonic way to iterate

    - by fmark
    I am using a module that is part of a commercial software API. The good news is there is a python module - the bad news is that its pretty unpythonic. To iterate over rows, the follwoing syntax is used: cursor = gp.getcursor(table) row = cursor.Next() while row: #do something with row row = cursor.next() What is the most pythonic way to deal with this situation? I have considered creating a first class function/generator and wrapping calls to a for loop in it: def cursor_iterator(cursor): row = cursor.Next() while row: yield row row = cursor.next() [...] cursor = gp.getcursor(table) for row in cursor_iterator(cursor): # do something with row This is an improvement, but feels a little clumsy. Is there a more pythonic approach? Should I create a wrapper class around the table type?

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  • PHP array taking up to much memory

    - by Dylan Taylor
    I have a multidimensional array. The array itself is fine. My problem is that the script takes up monster amounts of memory, and since I'm running this on my MAMP install on my iBook G4, my computer freezes up. Below is the full script. $query = "SELECT * FROM posts ORDER BY id DESC LIMIT 10"; $result = mysql_query($query); $posts = array(); while($row = mysql_fetch_array($result)){ $posts[$row["id"]]['post_id'] = $row["id"]; $posts[$row["id"]]['post_title'] = $row["title"]; $posts[$row["id"]]['post_text'] = $row["text"]; $posts[$row["id"]]['post_tags'] = $row["tags"]; $posts[$row["id"]]['post_category'] = $row["category"]; foreach ($posts as $post) { echo $post["post_id"]; } Is there a workaround that still achieves my goal (to export the MySQL query rows to an array)? -Dylan

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  • JTable filled with database data is not being updated when columns are reordered.

    - by marionmaiden
    I have a JTable filled with data of a table of my database (so I used ResultSetTableModel) and using TableRowSorter to sort the rows, as I click in one column of the JTable. The data is displayed in the jTable without problems; But when I sort the JTable by some column table (for example, sorting it by the primary key value), and edit some cell from the sorted jTable, the value changed is the old cell that were in that position before the ordenation of the column. For example: Suppose I have a table with 2 columns - name and age. My table has the following data: c 1 b 2 a 3 when I order i by name in the JTable, it becomes like this a 3 b 2 c 1 if I edit the value "1", after the edition, the table becomes like this a 1 b 2 c 1 It seems that the positions are not being updated in the JTable, and the values are edited considering their original positions.

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  • How to get a list of items when using cassandra

    - by Blankman
    When using a nosql type datastore like Cassandra, how would you return a result set based on a column? e.g. SELECT * FROM Articles WHERE category='blah' ORDER BY datetime DESC is this something that you would store in a sql db and then pull the data from cassandra? Or can cassandra handle this type of query? (assuming millions of rows in a db) From what I understand, cassandra is great at key based lookups, confused if it can and should be used for getting a list of data back and paging that data also (and if it is highly performant)

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  • ASP.NET Gridview Checkbox value to DataTable

    - by Mark
    Hey all, First off, im using a checkbox to highlight a true or false value from a dataset which I want to be able to change it. Unfortunately databinding the DataTable to the GridView checkboxes doesnt work (as you probably know) as it requires it to be in "edit" mode. The way I've gotten round this is having the checkbox reading the data table value seperately rather than being databound and locked: Checked='<%# Convert.ToBoolean(Eval("myValue")) %>' So that solves checkbox values from DataTable - GridView, now I need to do the opposite having the changed checkbox values go from GridView - DataTable as it is not ready to submit it to my data source (SQL) just yet. I figure I need to run a loop through the GridView rows, thats a give'un, what I can't figure out is how to replace/update just a single value in a row of a DataTable , only the ability to add or remove an entire row by the looks of things (something I don't want to do). So can anyone offer a workaround? Or is there a way to have a databound but always editable checkbox in a gridview?

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  • How do I gain Control of a row in Tabular Layout in Oracle

    - by DotNetDan
    This might be simple but I am new to Oracle. I am using Oracle 10g and have a form that lists our information from a linked table in a tabular Layout. The last column of data is a "list Item" item type that has the Element list of Enabled (T) and Disabled (F). What I need is when a user changes this dropdown, to disabled, I want ONLY that row to have some of the columns be disabled and not the entire column. This is also assuming on load of the form, it will disable and enable rows of data depending on what values are being pulled from the EnabledDisabled column in the database. Thanks for the help!

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  • Problem in creating different types of columns in a Winforms gridview

    - by Royson
    My windows form application has a grid view control with filename as a default column. User should create a column of following types Text, Number, Currency, Combo Box, Check Box, Radio Button ,Date time type (should display DateTimePicker control) and Hyper Link type. After that i want to pass all rows to next screen for further processing. We can create a column of these types in a grid view but how can i store it in a data table so that i can pass it to next screen. Or should i create a column in a data table and then assign data table to grid view by gridview.DataSource = dt; but can we create a these types of columns in a data table.

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  • Comparing 2 columns in the same table with the "Like" function

    - by Vic
    I'm trying to come up with a way to query the values in two different columns in the same table where the result set will indicate instances where the value of columnB doesn't contain the value of columnA. For example, my "Nodes" table contains columns "NodeName" and "DNS". The values should look similar to the following: NodeName DNS Router1 Router1.mydomain.com I want to run a query to show which rows have a DNS value that does not contain (or begin with) the value of the NodeName field. I think the query should function something similar to the following, but obviously I'm missing something with regard to the use of "Like" in this situation. SELECT NodeName, DNS WHERE DNS NOT LIKE 'NodeName%' I'm using SQL Server 2005, and any suggestions would be greatly appreciated... :)

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  • CheckboxList not setting Selected with Viewstate disabled

    - by Earlz
    I have a CheckboxList that seems to load and do everything right, except for when I do a postback, it will not have the Item.Selected property set. I have viewstate disabled for the entire page. I load it like so(inside Page_Load on every load): foreach (DataRow service in d.Tables[0].Rows) { cblServices.Items.Add(new ListItem((string)service["description"], service["id"].ToString())); } My markup is simple: <asp:CheckBoxList runat="server" ID="cblServices" Width="300px"></asp:CheckBoxList> and then, I use basically something like this(in a _Click serverside event for a button) foreach(ListItem item in cblServices.Items){ if(item.Selected){ MyLabel.Text+="selected: "+item.Value+item.Text; } } and MyLabel never has any text added to it. I can verify with the debugger that it does reach the _Click's foreach loop, but no item is ever selected. What could be the cause of this?

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  • large amount of data in many text files - how to process?

    - by Stephen
    Hi, I have large amounts of data (a few terabytes) and accumulating... They are contained in many tab-delimited flat text files (each about 30MB). Most of the task involves reading the data and aggregating (summing/averaging + additional transformations) over observations/rows based on a series of predicate statements, and then saving the output as text, HDF5, or SQLite files, etc. I normally use R for such tasks but I fear this may be a bit large. Some candidate solutions are to 1) write the whole thing in C (or Fortran) 2) import the files (tables) into a relational database directly and then pull off chunks in R or Python (some of the transformations are not amenable for pure SQL solutions) 3) write the whole thing in Python Would (3) be a bad idea? I know you can wrap C routines in Python but in this case since there isn't anything computationally prohibitive (e.g., optimization routines that require many iterative calculations), I think I/O may be as much of a bottleneck as the computation itself. Do you have any recommendations on further considerations or suggestions? Thanks

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  • dataset tables row count 'zero'

    - by James123
    I am using dataadapter.Fill() into dataset. But dataset returning tables rows count zero (0). When I ran same sp in sql mgmt. It is returning two tables data. If attributeId = 1 Then spString = "USP_group_1" ElseIf attributeId = 2 Then spString = "USP_group_2" ElseIf attributeId = 3 Then spString = "USP_group_3" End If sqlcmd_q.CommandTimeout = 120 sqlcmd_q.Connection = sqlCnn sqlcmd_q.CommandText = spString sqlcmd_q.CommandType = CommandType.StoredProcedure sqlcmd_q.Parameters.AddWithValue("@client_id", clientId) Try sqlCnn.Open() Dim daGrid As New SqlDataAdapter(sqlcmd_q) daGrid.Fill(dsGrid) daGrid.Dispose() Return dsGrid I don't understand why this happening?

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  • product suggestion based on user data

    - by Enkay
    I'm trying to add suggestions to product pages along the lines of : "Customers who purchased this item also purchased x and y". The way the data is compiled right now is a mysql table with 3 rows. PRODUCT | CUSTOMER |QUANTITY Product is the product ID. Customer is the customer ID. Quantity is the number of time that product was bought by that customer. For each product description page, the system needs to figure out which users bought that product, what other products those users bought, in what quantity and then return the 2 products that were bought the most by people who bought the current product. Hopefully this makes sense and someone can point me in the right directions as to what the mysql query should look like. Thanks.

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  • Make only one row show after search. flexgrid vb6

    - by Andeeh
    So i have flexgrid in my vb6 project I'm working on. It has names on each row, and I have a drop down so the user can select what name they want to see more info for, here is what I have. Dim target_name As String Dim r As Integer ' Get the name. target_name = Combo1 If Len(target_name) = 0 Then Exit Sub ' Search for the name, skipping the column heading row. target_name = LCase$(target_name) For r = 1 To MSFlexGrid1.Rows - 1 If LCase$(MSFlexGrid1.TextMatrix(r, 0)) = _ target_name Then ' We found the target. Select this row. MSFlexGrid1.Row = r MSFlexGrid1.RowSel = r MSFlexGrid1.Col = 0 MSFlexGrid1.ColSel = MSFlexGrid1.Cols - 1 ' Make the row visible. MSFlexGrid1.TopRow = r Exit Sub End If Next r That works well, but it shows everything below that name too, I would like it to single out only the name selected. Any help would be great.

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  • Accessing and binding events to an ASP.NET Grid view using Jquery

    - by Sayem Ahmed
    I have an ASP page which displays a text box when it loads. It takes an input number, send it to the server through post back, and then displays some record in a grid view. After a number is input into the box, the server fetches some data from a database and add records to the grid view. It also contains a link column, whose URL is set to "#", so that the page isn't redirected when it is clicked. Now I want to bind a jquery "click" event to that link. How can I do that ? I have tried that to do myself but failed, because it is not available when the DOM is loaded (since it only contains rows when a number is input through the box), and is being modified through ASP.NET Ajax post back.

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  • C# : changing listbox row colour?

    - by Meko
    HI. I am trying to changing backround colour of some rows on listbox.I have 2 list that one has all names and it shown on listbox.And second list has some same value with first list.I want to show that when clicking button it will search in listbox and in second list then will change colour where found value. I may search in list box like for (int i = 0; i < listBox1.Items.Count; i++) { for (int j = 0; j < students.Count; j++) if (listBox1.Items[i].ToString().Contains(students[j].ToString())) { } } But I dont know which method to change appearances of row.Any help?

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  • Skip some row in jsf dataTable

    - by Marc
    How to skip some rows to be displayed using dataTable: <h:dataTable cellspacing="0" id="dogs" value="#{dogBean.dogs}" var="dog" rendered="#{dogBeans.dogs != null}"> <h:column id="nameColumn"> <h:outputText value="#{dog.name}"/> </h:column> <h:column id="breedColumn"> <h:outputText value="#{dog.breed}"/> </h:column> </h:dataTable> I want to display all dogs, but those how have an age greater than 10. dog.age 10. I'm using Seam.

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  • How set panel Default Button that is inside a details view in asp.net?

    - by Avinash
    <asp:panel ID="Panel1" runat="server"> <asp:DetailsView ID="DetailsView1" .... <asp:templatefield ShowHeader="False"> <insertitemtemplate> <asp:Button ID="btnAdd" runat="server" CausesValidation="True" CommandName="Insert" Text="Insert"></asp:Button> ... <asp:DetailsView> </asp:panel> and i write the code for setting the panels default button in details view's DataBound event Button btnAdd = new Button(); btnAdd = DetailsView1.Rows[indexNumber].FindControl("btnAdd") as Button; Panel1.DefaultButton = btnAdd.UniqueID; but I get the error : The DefaultButton of 'Panel1' must be the ID of a control of type IButtonControl.

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  • PyQt4 Move QTableWidget row with widgets

    - by Guard
    I have the following method in my PyQt4 app. r2 is the number of row to move, and r1 is the position where it should be moved. To clarify: the table is filled with cellWidgets, not widgetItems. def move_row(self, r1, r2): tt = self.tableWidget tt.insertRow(r1) for c in range(tt.columnCount()): tt.setCellWidget(r1, c, tt.cellWidget(r2 + 1, c)) tt.removeRow(r2 + 1) # <--- ??? If I comment out the last line, it behaves as expected: the new row is inserted at position r1, it is filled with widgets from r2 (now it's r2+1), and the r2+1 row is empty. If I even hide this row, it behaves well, though it is not what I want (I have the rows numbered, and I don't want this hidden row to occupy the number). But if I remove the row, the widgets initially owned by it disappear. Looks like their ownership is taken on first placement, and is not changed after the move. Any ideas?

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  • mysql view performance

    - by vamsivanka
    I have a table for about 100,000 users in it. First Case: explain select * from users where state = 'ca' when i do an explain plan for the above query i got the cost as 5200 Second Case: Create or replace view vw_users as select * from users Explain select * from vw_users where state = 'ca' when i do an explain plan on the second query i got the cost as 100,000. How does the where clause in the view work ?? Is the where clause applied after the view retrieves all the rows. Please let know, how can i fix this issue. Thanks

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  • Can this sql query be simplified?

    - by Bas
    I have the following tables: Person, {"Id", "Name", "LastName"} Sports, {"Id" "Name", "Type"} SportsPerPerson, {"Id", "PersonId", "SportsId"} For my query I want to get all the Persons that excersise a specific Sport whereas I only have the Sports "Name" attribute at my disposal. To retrieve the correct rows I've figured out the following queries: SELECT * FROM Person WHERE Person.Id in ( SELECT SportsPerPerson.PersonId FROM SportsPerPerson INNER JOIN Sports on SportsPerPerson.SportsId = Sports.Id WHERE Sports.Name = 'Tennis' ) AND Person.Id in ( SELECT SportsPerPerson.PersonId FROM SportsPerPerson INNER JOIN Sports on SportsPerPerson.SportsId = Sports.Id WHERE Sports.Name = 'Soccer' ) OR SELECT * FROM Person WHERE Id IN (SELECT PersonId FROM SportsPerPerson WHERE SportsId IN (SELECT Id FROM Sports WHERE Name = 'Tennis')) AND Id IN (SELECT PersonId FROM SportsPerPerson WHERE SportsId IN (SELECT Id FROM Sports WHERE Name = 'Soccer')) Now my question is, isn't there an easier way to write this query? Using just OR won't work because I need the person who play 'Tennis' AND 'Soccer'. But using AND also doesn't work because the values aren't on the same row.

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  • Iterate through a DataTable to find elements in a List object?

    - by Darth Continent
    As I iterate through a DataTable object, I need to check each of its DataRow objects against the items in a generic string List. I found a blog post using the List's Find method along with a delegate, but whereas that example has a separate class (Person), I'm attempting something like the following using an instance of the string object: // My definition of the List object. List<string> lstAccountNumbers = new List<string>(); ... // I populate the List via its Add method. ... foreach (DataRow drCurrentRow in dtMyDataTable.Rows) { if (lstAccounts.Find(delegate(string sAccountNumber) { return sAccountNumber == drCurrentRow["AccountNumber"]; }) { Found_DoSomething(); } else { NotFound_DoSomethingElse(); } } However, with this syntax I'm receiving "Cannot implicitly convert type 'string' to 'bool'" for the if block. Could someone please clarify what I'm doing wrong and how best to accomplish what I'm trying to do?

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