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pandas read_csv and filter columns with usecols
...andas as pd
from StringIO import StringIO
csv = r"""dummy,date,loc,x
bar,20090101,a,1
bar,20090102,a,3
bar,20090103,a,5
bar,20090101,b,1
bar,20090102,b,3
bar,20090103,b,5"""
df = pd.read_csv(StringIO(csv),
header=0,
index_col=["date", "loc"],
usecols=["date", "loc", "x"],
...
dplyr: “Error in n(): function should not be called directly”
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120
I presume you have dplyr and plyr loaded in the same session. dplyr is not plyr. ddply is not a ...
Simplest code for array intersection in javascript
... Ry-♦
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answered Dec 11 '09 at 3:08
Anon.Anon.
49.5k88 gold badges...
Windows下 C++网络延时检测 - C/C++ - 清泛网 - 专注C/C++及内核技术
...ndlIcmp);
}
int CPing::Ping(char* strHost)
{
u_char FAR data[4] = { 0L }; //
//unsigned long Status = 0L; //
int PingTimes = 0; //
int Received = -2; //
unsigned long Minimum = 1000000;// 最小值设置为超时值
unsigned long Maximum = 0; // 最大值设置为0
unsigne...
Get decimal portion of a number with JavaScript
...
Use 1, not 2.
js> 2.3 % 1
0.2999999999999998
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Best way to parse RSS/Atom feeds with PHP [closed]
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How to create NS_OPTIONS-style bitmask enumerations in Swift?
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Swift 3.0
Almost identical to Swift 2.0. OptionSetType was renamed to OptionSet and enums are written lower case by convention.
struct MyOptions : OptionSet {
let rawValue: Int
static let firstOption = MyOptions(rawValue:...
make arrayList.toArray() return more specific types
...ist = new ArrayList<String>();
String[] a = list.toArray(new String[0]);
Before Java6 it was recommended to write:
String[] a = list.toArray(new String[list.size()]);
because the internal implementation would realloc a properly sized array anyway so you were better doing it upfront. Sinc...
How to get element by classname or id
... to access the DOM reference instead of the the jqLite reference - element[0] instead of element:
link: function (scope, element, attrs) {
var elementResult = element[0].getElementsByClassName('multi-files');
}
Alternatively you can use the document.querySelector function (need the period here...
Get PHP class property by string
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GSee
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answered Apr 30 '09 at 0:13
Peter BaileyPeter Bailey
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