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Omit rows containing specific column of NA
...ses function and put it into a function thusly:
DF <- data.frame(x = c(1, 2, 3), y = c(0, 10, NA), z=c(NA, 33, 22))
completeFun <- function(data, desiredCols) {
completeVec <- complete.cases(data[, desiredCols])
return(data[completeVec, ])
}
completeFun(DF, "y")
# x y z
# 1 1 0 ...
Full examples of using pySerial package [closed]
...he device you are connecting to)
ser = serial.Serial(
port='/dev/ttyUSB1',
baudrate=9600,
parity=serial.PARITY_ODD,
stopbits=serial.STOPBITS_TWO,
bytesize=serial.SEVENBITS
)
ser.isOpen()
print 'Enter your commands below.\r\nInsert "exit" to leave the application.'
input=1
whil...
Converting an integer to a hexadecimal string in Ruby
...
You can give to_s a base other than 10:
10.to_s(16) #=> "a"
Note that in ruby 2.4 FixNum and BigNum were unified in the Integer class.
If you are using an older ruby check the documentation of FixNum#to_s and BigNum#to_s
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schema builder laravel migrations unique on two columns
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edited Nov 13 '17 at 15:32
Chuck Le Butt
42.1k5555 gold badges167167 silver badges254254 bronze badges
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How to nicely format floating numbers to String without unnecessary decimal 0?
...ng)d);
else
return String.format("%s",d);
}
Produces:
232
0.18
1237875192
4.58
0
1.2345
And does not rely on string manipulation.
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How can I shrink the drawable on a button?
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正则表达式 30 分钟入门教程 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...作者以及来源。
正则表达式30分钟入门教程
版本：v2.31 (2009-4-11) 作者：deerchao 转载请注明来源
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如何使用本教程
正则表达式到底是什么东西？
入门
测试正则表达式
元字符
字符转义
重复
字...
Dashed line border around UIView
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135
You can set the border with this pattern using Layer and Bezier path like below examples.
Obj...
Django Server Error: port is already in use
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