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• How do I use sprintf to zero fill to a variable length in Perl?

  - by Michael Shnitzer

  I want to use perl's sprintf to zerofill a variable. sprintf("%08d", $var); but I want the dynamically determine how many digits to zero fill. How do I replace the "8" in sprintf("%08d", $var) with a variable called $zerofill. Thanks.

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• How are neural networks used when the number of inputs could be variable?

  - by Jeremy E

  All the examples I have seen of neural networks are for a fixed set of inputs which works good for images and fixed length data. How do you deal with variable length data such sentances, queries or source code. Is there a way to encode variable length data into fixed length inputs and still get the generalization properties of neural networks? Thanks

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• Can I change the default variable delimiter in Freemarker?

  - by JamesD

  I am working on a project where I am generating some code/scripts (specifically Perl scripts) via Java and Freemarker. I have it working for now, but was wondering if there was some way to change the default variable delimiter ($) in Freemarker? Or is there a different Java template engine that would use a variable delimiter more suitable for generating a Perl script?

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• How to define a ref-type variable from a assembly loaded at runtime?

  - by smwikipedia

  I want to define a ref type variable, like this: SomeType v=null and this "SomeType" is defined in another assembly which is loaded at runtime with AppDomain.CurrentDomain.Load(). I know how to create an object of "SomeType", but how to just define a ref-type variable only? Many thanks...

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• How to access the value of a url variable in a Zend view Helper?

  - by koko

  I want to access the value of a specific variable (in the url) in my view helper. How can I do this? I'm able to get my controller name with: Zend_Controller_Front::getInstance()-getRequest()-getControllerName(); , but I have no idea for the variable ... Thanks in advance!

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• Problem with checkboxes, sql select statements & php

  - by smokey20

  I am trying to display some rows from a database table based on choices submitted by the user. Here is my form code <form action="choice.php" method="POST" > <input type="checkbox" name="variable[]" value="Apple">Apple <input type="checkbox" name="variable[]" value="Banana">Banana <input type="checkbox" name="variable[]" value="Orange">Orange <input type="checkbox" name="variable[]" value="Melon">Melon <input type="checkbox" name="variable[]" value="Blackberry">Blackberry From what I understand I am placing the values of these into an array called variable. Two of my columns are called receipe name and ingredients(each field under ingredients can store a number of fruits). What I would like to do is, if a number of checkboxes are selected then the receipe name/s is displayed. Here is my php code. <?php // Make a MySQL Connection mysql_connect("localhost", "*****", "*****") or die(mysql_error()); mysql_select_db("****") or die(mysql_error()); $variable=$_POST['variable']; foreach ($variable as $variablename) { echo "$variablename is checked"; } $query = "SELECT receipename FROM fruit WHERE $variable like ingredients"; $row = mysql_fetch_assoc($result); foreach ($_POST['variabble'] as $ingredients) echo $row[$ingredients] . '<br/>'; ?> I am very new to php and just wish to display the data, I do not need to perform any actions on it. I have tried many select statements but I cannot get any results to display. My db connection is fine and it does print out what variables are checked. Many thanks in advance.

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• How do you check if a variable is an array in JavaScript ?

  - by Andy McCluggage

  I would like to check whether a variable is either an array or a single value in JavaScript. I have found a possible solution... if (variable.constructor == Array)... Is this the best way this can be done?

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• Why can't I create an array with size determined by a global variable?

  - by ashish yadav

  Why does the array a not get initialized by global variable size? #include<stdio.h> int size=5; int main() { int a[size]={1,2,3,4,5}; printf("%d",a[0]); return 0; } The compilation error is shown as "variable-sized object may not be initialized". According to me the array should get initialized by size.

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• MySQL searching using many 'like' operators: is there a better way?

  - by DrAgonmoray

  I have a page that gets all rows from a table in a database, then displays the rows in an HTML table. That works great, but now I want to implement a 'search' feature. There is a searchbox, and search-terms are separated by a space. I am going to make it search three fields for the search terms, 'make' 'model' and 'type.' These three fields are VARCHAR(30). Currently if I wanted to search using 3 terms (say 'cool' 'abc' and '123') my query would look something like this. SELECT * FROM table WHERE make LIKE '%cool%' OR make LIKE '%abc%' OR make LIKE '%123%' OR model LIKE '%cool%' OR model LIKE '%abc%' OR model LIKE '%123%' OR type LIKE '%cool%' OR type LIKE '%abc%' OR type LIKE '%123%' That looks really bad, and it will get even worse if there are more search terms or more fields to search. My question to you: is there a better way to search? If so, what?

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• How can i assign xml scripts in to a php variable?

  - by Himel Khan

  I can not assign a xml scripts in to a php variable. My xml text: <?xml version="1.0" encoding="UTF-8" ?><rss version="2.0"><channel> <title>coolajax.net</title> <link>http://www.hotscripts.com/listings/feed</link> <description>Coolajax Scripts Listings Description</description> and I want to assign this text in to $xml_header variable. can anyone help me..

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• How do I send a javascript variable to a subsequent jquery function or set of braces?

  - by desbest

  How do I send a javascript variable to a subsequent jquery function? Here is my code. <script type="text/javascript"> $(function() { var name = $("#name"), email = $("#email"), password = $("#password"), itemid = $("#itemid"), tips = $(".validateTips"); function updateTips(t) { tips .text(t) .addClass('ui-state-highlight'); setTimeout(function() { tips.removeClass('ui-state-highlight', 1500); }, 500); } $("#dialog-form").dialog({ autoOpen: false, height: 320, width: 350, modal: true, /* buttons: { 'Change category': function() { alert("The itemid2 is "+itemid2); var bValid = true; $('#users tbody').append('<tr>' + '<td>' + name.val() + '</td>' + '<td>' + email.val() + '</td>' + '<td>' + password.val() + '</td>' + '<td>' + itemid.val() + '</td>' + '</tr>'); $(this).dialog('close'); }, Cancel: function() { $(this).dialog('close'); } }, */ close: function() { allFields.val('').removeClass('ui-state-error'); } }); $('.changecategory') .button() .click(function() { var categoryid = $(this).attr("categoryid"); var itemid = $(this).attr("itemid"); var itemid2 = $(this).attr("itemid"); var itemtitle = $(this).attr("itemtitle"); var parenttag = $(this).parent().get(0).tagName; var removediv = "itemid_" +itemid; alert("The itemid is "+itemid); $('#dialog-form').dialog('open'); }); }); </script> I'll break it down. The .changecategory section happens FIRST when an image on my page is clicked. $("#dialog-form").dialog({ is then called, and the variable item id is not passed to this function. How can I pass a variable from one function to another? Is that possible. Is there a way I can pass a variable to another jquery function without having to resort of setting a cookie with javascript and then using jquery to read it?

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• MySQL not using index on DATE when used with '<' or '>' operators?

  - by Haroldo

  I'm using explain to test these queries. The col type is DATE this uses index: explain SELECT events.* FROM events WHERE events.date = '2010-06-11' this doesnt explain SELECT events.* FROM events WHERE events.date >= '2010-06-11' index as follows (phpmyadmin) Action Keyname Type Unique Packed Field Cardinality Collation Null Comment Edit Drop PRIMARY BTREE Yes No event_id 18 A Edit Drop date BTREE No No date 0 A i notice cardinality is 0, though there are some rows with the same date..

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• In Python, are there builtin functions for elementwise boolean operators over boolean lists?

  - by bshanks

  For example, if you have n lists of bools of the same length, then elementwise boolean AND should return another list of that length that has True in those positions where all the input lists have True, and False everywhere else. It's pretty easy to write, i just would prefer to use a builtin if one exists (for the sake of standardization/readability). Here's an implementation of elementwise AND: def eAnd(*args): return [all(tuple) for tuple in zip(*args)] example usage: >>> eAnd([True, False, True, False, True], [True, True, False, False, True], [True, True, False, False, True]) [True, False, False, False, True] thx

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• How to vertically center content with variable height within a div?

  - by jessegavin

  What is the best way to vertically center the content of a div when the height of the content is variable. In my particular case, the height of the container div is fixed, but it would be great if there were a solution that would work in cases where the container has a variable height as well. Also, I would love a solution with no, or very little use of CSS hacks and/or non-semantic markup.

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• Powershell's Get-date: How to get Yesterday at 22:00 in a variable?

  - by icnivad

  For a check i need yesterday's date at 10:00pm in a variable. I get yesterdays Date and current Time with $a = (get-date).AddDays(-1) But how do i manipulate the time to 22.00 and leave the variable still as Date-Object?

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• Populate JOIN into a list in one database query

  - by axio

  I am trying to get the records from the 'many' table of a one-to-many relationship and add them as a list to the relevant record from the 'one' table. I am also trying to do this in a single database request. Code derived from http://stackoverflow.com/questions/1580199/linq-to-sql-populate-join-result-into-a-list almost achieves the intended result, but makes one database request per entry in the 'one' table which is unacceptable. That failing code is here: var res = from variable in _dc.GetTable<VARIABLE>() select new { x = variable, y = variable.VARIABLE_VALUEs }; However if I do a similar query but loop through all the results, then only a single database request is made. This code achieves all goals: var res = from variable in _dc.GetTable<VARIABLE>() select variable; List<GDO.Variable> output = new List<GDO.Variable>(); foreach (var v2 in res) { List<GDO.VariableValue> values = new List<GDO.VariableValue>(); foreach (var vv in v2.VARIABLE_VALUEs) { values.Add(VariableValue.EntityToGDO(vv)); } output.Add(EntityToGDO(v2)); output[output.Count - 1].VariableValues = values; } However the latter code is ugly as hell, and it really feels like something that should be do-able in a single linq query. So, how can this be done in a single linq query that makes only a single database query? In both cases the table is set to preload using the following code: _dc = _db.CreateLinqDataContext(); var loadOptions = new DataLoadOptions(); loadOptions.LoadWith<VARIABLE>(v => v.VARIABLE_VALUEs); _dc.LoadOptions = loadOptions; I am using .NET 3.5, and the database back-end was generated using SqlMetal.

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• How much data can a javascript global variable hold??

  - by alex

  Hi, To enable a go back function with an ajax div i have create these simple functions and i was wondering how much data a .js global variable can hold?? var dataAfterSearch; //global variable which holds our search results function goBackAfterSearch() { /** * function which displays the previous state * **/ $.ajaxSetup ({ cache: false }); //alert("Previous Search" +dataAfterSearch); $('#result').html(dataAfterSearch); paginateIt(); } function setDataAfterSearch(data) { /** * function to set the global dataAfterSearch * **/ dataAfterSearch = data; } kind regards

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• Why isn't this infinite recursion? How does default variable initialization work in VB.NET?

  - by froadie

  I just made an interesting mistake in my code: Dim endColumn As Integer = startColumn + endColumn - 1 The code was actually supposed to be: Dim endColumn As Integer = startColumn + numColumns - 1 The interesting thing is, I would think that this code should be recursive and loop indefinitely, as the initialization of endColumn sort of calls itself. However, it seems that the code just treats the uninitialized variable as a 0 and so I get startColumn + 0 - 1. What is happening here behind the scenes? When does a variable get assigned a default value?

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• Is it bad practice to not assign a new object to a variable?

  - by Jeff

  Is it bad javascript practice to not assign a newly created object to a variable if you're never going to access it? For example: for(var i=0;i<links.length;i++){ new objectName(links[i]); } And again, I won't be accessing it, so there's no need for a variable to reference it.

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• How i can i use the value of a variable from one class in another in objective c?

  - by user337174

  Hi i am fairly new to objective c and have been doing some iphone programming. Is it possible to look up the value of a variable in a different class? Basically what i am doing is running a function that exists in my app delegate from a view controller, but the app delegate needs to use a variable stored in the view controller from which the app delegate function was called. Make sense??? Any help would be grateful. James

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• Is it possible to emit warning when I read value of unset variable?

  - by sergdev

  How to configure PHP to emit warning when I try to read value of unset variable? It is frequently happens when I rename variable in one place, I obtain weird result because I forgot to rename it in other place.

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• What is the best signature for overloaded arithmetic operators in C++?

  - by JohnMcG

  I had assumed that the canonical form for operator+, assuming the existence of an overloaded operator+= member function, was like this: const T operator+(const T& lhs, const T& rhs) { return T(lhs) +=rhs; } But it was pointed out to me that this would also work: const T operator+ (T lhs, const T& rhs) { return lhs+=rhs; } In essence, this form transfers creation of the temporary from the body of the implementation to the function call. It seems a little awkward to have different types for the two parameters, but is there anything wrong with the second form? Is there a reason to prefer one over the other?

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• How Assigning query return value to local a variable, and how to use that in where condition?

  - by Ayyappan.Anbalagan

  I am using mysql stored procedure; I need to assign query retuned value to local variable. And i have to check the condition using the local variable..... or It my query Select Meterial_Id from hemaepdb.transaction where CustId=1; Instead of Meterial_Id i need to get the Meterial_name from Material table.....

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• Java cannot overload any operators. Why?

  - by arunagiri

  In c++, we can perform the operator overloading. But Java is also a Object oriented language. So why java doesn't support overloading?

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• Calling a getter multiple times or calling once and assigning to a variable?

  - by GK

  say suppose I have class as : public class Age { private int age; public int getAge() { return this.age; } } In my Main class I am calling the getAge() method many times. So I wanted to know is it advisable to call so many times or call once and assign it to some variable and use that variable. Which is best and why?

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