Trevor Max zhao-ji

## gist:4c9c18428f30099b651f
class Num:
    '''output the nature number'''
    num = 0

    def next_num(self):
        yield self.num
        self.num += 1

## viewport
 <!--在html代码的<head>...</head>中嵌入下面代码-->
<meta name="viewport"
content="
height = [pixel_value | device-height] ,
width = [pixel_value | device-width ] ,
initial-scale = 0.5 ,
minimum-scale = float_value ,
maximum-scale = float_value ,
user-scalable = [yes | no] ,
"

## latency.markdown

      
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                zhao-ji
                / latency.markdown
            
            
              Last active
              August 29, 2015 14:13
                — forked from hellerbarde/latency.markdown
            
          
    Latency numbers every programmer should know

L1 cache reference ......................... 0.5 ns
Branch mispredict ............................ 5 ns
L2 cache reference ........................... 7 ns
Mutex lock/unlock ........................... 25 ns
Main memory reference ...................... 100 ns             
Compress 1K bytes with Zippy ............. 3,000 ns  =   3 µs
Send 2K bytes over 1 Gbps network ....... 20,000 ns  =  20 µs
SSD random read ........................ 150,000 ns  = 150 µs

Read 1 MB sequentially from memory ..... 250,000 ns = 250 µs

  
## gist:d22d71d336f82149b67f
private const double EARTH_RADIUS = 6378.137;
private static double rad(double d)
{
   return d * Math.PI / 180.0;
}
public static double GetDistance(double lat1, double lng1, double lat2, double lng2)
{
   double radLat1 = rad(lat1);
   double radLat2 = rad(lat2);
   double a = radLat1 - radLat2;
	class Num:
	'''output the nature number'''
	num = 0

	def next_num(self):
	yield self.num
	self.num += 1
	<!--在html代码的<head>...</head>中嵌入下面代码-->
	<meta name="viewport"
	content="
	height = [pixel_value \| device-height] ,
	width = [pixel_value \| device-width ] ,
	initial-scale = 0.5 ,
	minimum-scale = float_value ,
	maximum-scale = float_value ,
	user-scalable = [yes \| no] ,
	"
	private const double EARTH_RADIUS = 6378.137;
	private static double rad(double d)
	{
	return d * Math.PI / 180.0;
	}
	public static double GetDistance(double lat1, double lng1, double lat2, double lng2)
	{
	double radLat1 = rad(lat1);
	double radLat2 = rad(lat2);
	double a = radLat1 - radLat2;