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public synchronized String xmlWrite(String rootEle){
        sb.delete(0,sb.length());
        StringBuffer append = sb.append("<?xml version=\"1.0\" encoding=\"UTF-8\"?>").append("<").append(rootEle).append(">");
        String s="";
        for(int i=0;i<v.size();i++){
            s=s.concat("<vectorData>"+(String)v.elementAt(i)+"</vectorData>");
        }
        append.append(s);
        append.append("</").append(rootEle).append(">");
        String s2=append.toString();

LasMD

WITH test_cv1 as(
select
  * 
from
  train_cv where gid=1
) INSERT OVERWRITE TABLE cv1
SELECT 
  t2.rowid,
  t3.sales,
  EXP(predicted)-1 as predicted

LasMD

How to make faster scroll effects?

• Avoid too many reflows (the browser to recalculate everything)
• Use advanced CSS3 for graphic card rendering
• Precalculate sizes and positions

Beware of reflows

The reflow appens as many times as there are frames per seconds. It recalculate all positions that change in order to diplay them. Basically, when you scroll you execute a function where you move things between two reflows. But there are functions that triggers reflows such as jQuery offset, scroll... So there are two things to take care about when you dynamically change objects in javascript to avoid too many reflows:

LasMD

What forces layout / reflow

All of the below properties or methods, when requested/called in JavaScript, will trigger the browser to synchronously calculate the style and layout*. This is also called reflow or layout thrashing, and is common performance bottleneck.

Element

Box metrics

• elem.offsetLeft, elem.offsetTop, elem.offsetWidth, elem.offsetHeight, elem.offsetParent
• elem.clientLeft, elem.clientTop, elem.clientWidth, elem.clientHeight
• elem.getClientRects(), elem.getBoundingClientRect()

LasMD

/* iPhone 6 Plus & iPad Air 2 media query (Retina HD displays).
   Also works for similar Android devices. */
/* Use x2 images by default. */
.logo {
  background-image: url(http://hellyeah.is/images/text-logo-ns@x2.png);
  height: 300px;
  width: 100%;
  background-size: contain;
  background-repeat: no-repeat;
  background-position: center;

LasMD

/* ---------------------------------------------------------- */
/*                                                            */
/* A media query that captures:                               */
/*                                                            */
/* - Retina iOS devices                                       */
/* - Retina Macs running Safari                               */
/* - High DPI Windows PCs running IE 8 and above              */
/* - Low DPI Windows PCs running IE, zoomed in                */
/* - Low DPI Windows PCs and Macs running Firefox, zoomed in  */
/* - Android hdpi devices and above                           */

LasMD

/* ---------------------------------------------------------- */
/*                                                            */
/* A media query that captures:                               */
/*                                                            */
/* - Retina iOS devices                                       */
/* - Retina Macs running Safari                               */
/* - High DPI Windows PCs running IE 8 and above              */
/* - Low DPI Windows PCs running IE, zoomed in                */
/* - Low DPI Windows PCs and Macs running Firefox, zoomed in  */
/* - Android hdpi devices and above                           */

LasMD

import java.time.*;
import java.time.format.DateTimeFormatter;
import java.time.format.FormatStyle;
import java.time.temporal.ChronoUnit;
import java.time.temporal.TemporalAdjusters;
import java.util.*;

import static java.time.temporal.TemporalAdjusters.*;

public class Java8DateTimeExamples {

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Copied from http://code.lancepollard.com/complete-list-of-html-meta-tags/

Basic HTML Meta Tags

<meta charset='UTF-8'>
<meta name='keywords' content='your, tags'>
<meta name='description' content='150 words'>
<meta name='subject' content='your website's subject'>
<meta name='copyright' content='company name'>

LasMD

/**
 * A collection of helper prototype for everyday DOM traversal, manipulation,
 * and event binding. Sort of a minimalist jQuery, mainly for demonstration 
 * purposes. MIT @ m3g4p0p
 */
window.$ = (function (undefined) {

  /**
   * Duration constants
   * @type {Object}