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Fastest way to replace NAs in a large data.table
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10 Answers
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How to split a string and assign it to variables
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import (
"fmt"
"strings"
)
func main() {
s := strings.Split("127.0.0.1:5432", ":")
ip, port := s[0], s[1]
fmt.Println(ip, port)
}
Output:
127.0.0.1 5432
One step, for example,
package main
import (
"fmt"
"net"
)
func main() {
host, port, err := net.SplitHost...
Truncate number to two decimal places without rounding
Suppose I have a value of 15.7784514, I want to display it 15.77 with no rounding.
36 Answers
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Java synchronized static methods: lock on object or class
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129
Since a static method has no associated object, will the synchronized keyword lock on the ...
Does JavaScript have a method like “range()” to generate a range within the supplied bounds?
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Setting different color for each series in scatter plot on matplotlib
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import matplotlib.pyplot as plt
import matplotlib.cm as cm
x = np.arange(10)
ys = [i+x+(i*x)**2 for i in range(10)]
colors = cm.rainbow(np.linspace(0, 1, len(ys)))
for y, c in zip(ys, colors):
plt.scatter(x, y, color=c)
Or you can make your own colour cycler using itertools.cycle and specif...
Remove rows with all or some NAs (missing values) in data.frame
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16 Answers
16
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MySQL一次主从数据不一致的问题解决过程 - 数据库(内核) - 清泛网 - 专注C/...
...库缺少的数据补上
下面是能想到和找到的几个方案
1 从新从0开始同步，虽然对主库的使用没有影响，但是那么大的数据量，对性能，网络影响有点大，数据丢失的应该很少
2 主库dump数据，锁库，然后同步，不好。 影响业...
How to print color in console using System.out.println?
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13 Answers
13
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How to model type-safe enum types?
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189
http://www.scala-lang.org/docu/files/api/scala/Enumeration.html
Example use
object Main ex...