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• R equivalent of SELECT DISTINCT on two or more fields/variables

  - by wahalulu

  Say I have a dataframe df with two or more columns, is there an easy way to use unique() or other R function to create a subset of unique combinations of two or more columns? I know I can use sqldf() and write an easy "SELECT DISTINCT var1, var2, ... varN" query, but I am looking for an R way of doing this. It occurred to me to try ftable coerced to a dataframe and use the field names, but I also get the cross tabulations of combinations that don't exist in the dataset: uniques <- as.data.frame(ftable(df$var1, df$var2))

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• Can you call Directory.GetFiles() with multiple filters?

  - by Jason Z

  I am trying to use the Directory.GetFiles() method to retrieve a list of files of multiple types, such as mp3's and jpg's. I have tried both of the following with no luck: Directory.GetFiles("C:\\path", "*.mp3|*.jpg", SearchOption.AllDirectories); Directory.GetFiles("C:\\path", "*.mp3;*.jpg", SearchOption.AllDirectories); Is there a way to do this in one call?

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• iPhone. Open application during call

  - by immuner

  Is there any way to do this? In other words, is it possible during a call to allow the user to open a certain application? (for example, to provide information based on the person who is calling). If not, will something like this be available on iOS 4?

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• How to debug ctypes call of c++ dll?

  - by aF

  Hello, in my python project I call a c++ dll using ctypes library. That c++ dll consists on a wrapper dll that calls methods of a c# com interop dll. Sometimes I have a COM exception. I like to see what it corresponds exactlly but I don't know how to do it? How can I attach the c++ debugger to this situation? Thanks in advance

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• Gettting selected value of a dropdown (<select>) element in jQuery

  - by shyam

  How can I get the selected value of a dropdown box using jQuery? I tried using var value = $('#dropDownId').val(); and var value = $('select#dropDownId option:selected').val(); but both returns an empty string.

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• how to select the records whose several fields' combination will equal to a specific value

  - by poiu2000

  Hi all, Assume I have the following style table, col1 col2 and col3 have same value scopes, I want to select the records when two of the 3 columns have a value combination such as ('ab' and 'bc'), in the following example, the first 3 records should be selected. Any good way to do this? I am using Sybase. | id | col1 | col2 | col3 | 1 ab bc null 2 null ab bc 3 ab ab bc 4 de ab xy Thanks.

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• How can I select the required records?

  - by simple

  Tables: Product: [id, name, brand_id, is_published] Brand: [id, name, is_published] Awards: [id, name] ProductAwards [product_id, award_id] How do I select the list of PUBLISHED brands along with the number of AWARDS of brand's products that are Published. I am cool with all the part except issuing the "is_published" restriction when counting Awards. I hope this is clear; can anyone just suggest where to dig?

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• Call to undefined function phpinclude_once()

  - by Alex Zylman

  I'm making a new php page and I get the error Fatal error: Call to undefined function phpinclude_once() in /home8/nuventio/public_html/marketing/pb2/dashboard.php on line 1 I'm not sure why I'm getting this error, I've done previous pages the same way as this with no problems. This is the line in question: <?php include_once("../utils.php"); ?> After that it just goes into regular HTML code. It works fine without that line.

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• Getting text of html select in javascript?

  - by poo

  select.onchange = function() { this.value; } It's easy to retrieve the value but now I need the text of the selected element. How to do it?

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• How to bind data from a datatable into a select box

  - by tuanvm

  I found demo of Dual Listbox jQuery Plug-in But I don't know how can I bind data from a datatable into a select box. Can you help me, please!

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• Select the next N elements of an IEnumerable<T>

  - by sassafrass

  Say you've got some IEnumerable called S of length N. I would like to select all continuous subsequences of length n <= N from S. If S were, say, a string, this'd be pretty easy. There are (S.Length - n + 1) subsequences of length n. For example, "abcdefg" is length (7), so that means it has (5) substrings of length (3): "abc", "bcd", "cde", "def", "efg". But S could be any IEnumerable, so this route isn't open. How do I use extension methods to solve this?

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• Randomly select file in PHP

  - by user201140

  I'd like to use the 'include' keyword in php to randomly select a file from a folder and output the contents. How would I do this? Thanks.

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• Select log lines from today in mysql

  - by ripper234

  I never remember how to do this properly - can you help me fix this query? SELECT * from log where now() - EventTime < '1 day' Note - this question seems identical but there's no solution there for mysql.

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• Call javascript from MVC controller action

  - by Grienders

  Can I call javascript function from MVC controller action (not from view page) and get return value? How?

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• jQuery - Call function once at end of each loop

  - by user668499

  How can I call a function once at the end of an each loop. This alerts 'finished' on each loop, I want it once when the loop has finished. $(function(){ var imgArr=[]; var lis = $('#gallery li') lis.each(function(){ imgArr.push(this.outerHTML); $(this).remove(); alertFun(); }) function alertFun(){ alert('finished'); } })

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• When do we make a call to use between Synchronised method and Synchronised Block

  - by Cricandcric.com

  Can any one please share their experience on "When do we make a call to use between Synchronised method and Synchronised Block" Any Performance Issues?

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• SQL query to select records from three Tables seperatly

  - by Azhar

  SQL query which select the record from three tables and there is no relation between these tables. Actually I want to make it a VIEW. suppose there are three tales Table1, Table2, Table3 I want to show records of Table1 first with some filter criteria and then the records from Table2 and in last from Table3 as when we execute the view it show like the records like a Table. There can be any number of rows but the records must be in this sequence.

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• I call session_start() the script hangs and nothing happens

  - by shovon

  I am running php5, however as soon as I call session_start() the script hangs and nothing happens. Is anyone else experiencing this problem, or am I doing something incorrectly? I am using session_start() on index.php and for some reason sometimes it'll fail. No warnings, no errors, no notices, not even after prepending error_reporting(E_ALL) and ini_set('display_errors', TRUE) before session_start() do I see anything, it just plain dies.

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• javascript function to call in order to click OK on confirmation dialog

  - by Thiyagarajan Veluchamy

  I am writed an automated test in Selenium IDE to test one of our applications. Our app throws one of those confirmation dialogs "Are you sure you want to continue." Click OK or Cancel Selenium does not support the clicking of these dialog boxes. I have tried the following SeleniumIDE functions with no success: chooseOkOnNextConfirmation chooseOkOnNextConfirmationAndWait Is there a javascript funtion I can call within SeleniumIDE to do this, or am I out of luck.

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• Why should I call self=[super init]

  - by Michael

  Let's say I create my class and its init method. Why should I call and return value of superclass init assigned to self? Which cases it covers? I would appreciate examples why would I need it for Cocoa superclass and non-Cocoa.

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• Select Element from a div tag

  - by MSI

  How can I select the first tag with center id name in sample below code? <div id=first> <div id=center></div> </div> <div id=first> <div id=center></div> </div>

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• [R] select values from list using Date as index

  - by Pieter

  Suppose I have a list as follows bar=c() bar["1997-10-14"]=1 bar["2001-10-14"]=2 bar["2007-10-14"]=1 How can I select from this list all values for which the index is within a specific date range? So, if I look for all values between "1995-01-01" and "2000-06-01", I should get 1. And similarly for the period "2001-09-01" and "2007-11-04", I should get 2 an 1.

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• Operand should contain 1 column(s) about insert into & select

  - by user1038890

  "insert into NodeProfileSections (profile_no, tpl_section_no) select (np.profile_no, tps.tpl_section_no) from NodeProfile np, TemplateProfileSection tps, TemplateProfile tp where np.hostname = '%s' AND np.role = '%s' AND tp.tpl_profile_no = tps.tpl_profile_no AND tp.tpl_name = '%s' AND tp.role = '%s' AND tps.tpl_section_name = '%s';" %(hostname, role, template_name, role, section_name) error_message = 'Operand should contain 1 column(s)' How to solve this problem?

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• SELECT DISTINCT multiple field search?

  - by Patrick

  I'm trying to search multiple fields zc_city and zc_zip for when user input and then return row results for zc_city zc_state and zc_zip $q = strtolower($_GET["q"]); if (!$q) return; $sql = "SELECT DISTINCT zc_city AS zcity FROM search_zipcodes WHERE zc_city LIKE '$q%'"; $rsd = mysql_query($sql); while($rs = mysql_fetch_array($rsd)) { $zcity = $rs['zcity']; echo "$zcity\n"; }

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• mysql select help

  - by user344766

  Hi I have a table that looks like this id : productid : featureid and would have the following data: (1, 1, 16) (2, 1, 21) (3, 1, 25) (4, 2, 16) (5, 2, 21) (6, 2, 27) where featureid is a foreign key to another table. I need to select products that have both featureids of 16 and 25, in which case productid 1 but not productid 2 Can someone show me an example of how to format this query.

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