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Pandas: drop a level from a multi-level column index?
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edited Mar 28 '16 at 16:32
ASGM
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What does the NS prefix mean?
Many classes in Cocoa/Cocoa Touch have the NS prefix. What does it mean?
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Stop an input field in a form from being submitted
I'm writing some javascript (a greasemonkey/userscript) that will insert some input fields into a form on a website.
12 Ans...
How to make an HTML back link?
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edited Apr 8 '15 at 15:55
Ruslan López
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JavaScript/JQuery: $(window).resize how to fire AFTER the resize is completed?
... CMS's solution that can be called in multiple places in your code:
var waitForFinalEvent = (function () {
var timers = {};
return function (callback, ms, uniqueId) {
if (!uniqueId) {
uniqueId = "Don't call this twice without a uniqueId";
}
if (timers[uniqueId]) {
clearT...
How can I start an interactive console for Perl?
...vely there's Alexis Sukrieh's Perl Console application, but I haven't used it.
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Efficient SQL test query or validation query that will work across all (or most) databases
Many database connection pooling libraries provide the ability to test their SQL connections for idleness. For example, the JDBC pooling library c3p0 has a property called preferredTestQuery , which gets executed on the connection at configured intervals. Similarly, Apache Commons DBCP has valid...
Very large matrices using Python and NumPy
NumPy is an extremely useful library, and from using it I've found that it's capable of handling matrices which are quite large (10000 x 10000) easily, but begins to struggle with anything much larger (trying to create a matrix of 50000 x 50000 fails). Obviously, this is because of the massive memo...
Commands out of sync; you can't run this command now
...ecause mysqli uses unbuffered queries by default (for prepared statements; it's the opposite for vanilla mysql_query). You can either fetch the first one into an array and loop through that, or tell mysqli to buffer the queries (using $stmt->store_result()).
See here for details.
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Java String to SHA1
...presentation using Base64. Apache Commons Codec API 1.4, has this nice utility to take away all the pain. refer here
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