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How to reshape data from long to wide format
...condName -0.8204684 0.4874291 0.7383247 0.5757814
And, as of data.table v1.9.6 we can cast on multiple columns
## add an extra column
dat1[, value2 := value * 2]
## cast multiple value columns
dcast(dat1, name ~ numbers, value.var = c("value", "value2"))
# name value_1 value_2 ...
How to read a file in reverse order?
...read_backwards.
After installing it, via pip install file_read_backwards (v1.2.1), you can read the entire file backwards (line-wise) in a memory efficient manner via:
#!/usr/bin/env python2.7
from file_read_backwards import FileReadBackwards
with FileReadBackwards("/path/to/file", encoding="utf...
App Inventor 2 数学代码块 · App Inventor 2 中文网
...为小数，小数点后指定位数。位数必须是非负整数，如果位置太多结果是通过对数字进行四舍五入生成的；如果位置太少，则右侧补零。
是否为数字 (is a number)
如果给定对象是数字，则返回 真，否则返回 假。
进制转换 (co...
How to configure a HTTP proxy for svn
...
latest svnbook link (v1.7) for "servers" file configuration: svnbook.red-bean.com/en/1.7/…
– michael
Nov 20 '13 at 21:04
...
How do I start PowerShell from Windows Explorer?
...und\shell\powershell\command]
@="C:\\Windows\\System32\\WindowsPowerShell\\v1.0\\powershell.exe -NoExit -Command Set-Location -LiteralPath '%V'"
;
; Add context menu entry to Windows Explorer folders
;
[HKEY_CLASSES_ROOT\Directory\shell\powershell]
@="Open PowerShell window here"
"NoWorkingDirector...
__attribute__ - C/C++ - 清泛网 - 专注C/C++及内核技术
...。
__attribute__语法格式为：
__attribute__ ((attribute-list))
其位置约束为：
放于声明的尾部“；”之前。
函数属性（Function Attribute）
函数属性可以帮助开发者把一些特性添加到函数声明中，从而可以使编译器在错误检查方面的功...
Use RSA private key to generate public key?
... less
This structure of the RSA private key is recommended by the PKCS#1 v1.5 as an alternative (second) representation. PKCS#1 v2.0 standard excludes e and d exponents from the alternative representation altogether. PKCS#1 v2.1 and v2.2 propose further changes to the alternative representation, b...
I have an error: setOnItemClickListener cannot be used with a spinner, what is wrong?
...
@Override
public void onItemClick(AdapterView<?> arg, View v1, int index1, long arg4)
{
if ((quantity[index1]=="Meter") && (s1.equalsIgnoreCase("Meter")))
{
Toast.makeText(v1.getContext(), " to meter",Toast.LENGTH_SHORT).show();
var2=var1...
Is it possible to declare git repository as dependency in android gradle?
...}
}
And now in your build.gradle you can point to a specific tag (e.g.: 'v1.0'):
dependencies {
...
implementation 'org.gradle.cpp-samples:utilities:v1.0'
}
Or to a specific branch:
dependencies {
...
implementation('org.gradle.cpp-samples:utilities') {
version {
...
How do I replace NA values with zeros in an R dataframe?
...le(c(NA, 1:10), 100, replace = TRUE), 10)
> d <- as.data.frame(m)
V1 V2 V3 V4 V5 V6 V7 V8 V9 V10
1 4 3 NA 3 7 6 6 10 6 5
2 9 8 9 5 10 NA 2 1 7 2
3 1 1 6 3 6 NA 1 4 1 6
4 NA 4 NA 7 10 2 NA 4 1 8
5 1 2 4 NA 2 6 2 6 7 4
6 NA 3 NA NA 10 2 1 ...