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App Inventor 2 拓展参考文档 · App Inventor 2 中文网
...onButton 扩展：悬浮操作按钮扩展，可自定义颜色、大小、位置和图标，支持多按钮
【悬浮按钮】FloatActionBtn 扩展：悬浮操作按钮扩展，可自定义颜色、大小、图标和位置，单按钮，简单易用
多媒体
【文...
一分钟明白 VS manifest 原理 - C/C++ - 清泛网 - 专注C/C++及内核技术
...windows>
<assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
<dependentAssembly>
<assemblyIdentity type="win32" name="Microsoft.VC80.ATL" processorArchitecture="x86" publicKeyToken="1fc8b3b9a1e18e3b"></assemblyIdentity>
<bindingRedirect oldVersion="8.0...
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 sum a variable by group
...dplyr will be quite a lot faster than base functions, however (can well be 100-1000 times faster for some operations). Also see here
– talat
Jan 23 '15 at 14:50
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How to configure a HTTP proxy for svn
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latest svnbook link (v1.7) for "servers" file configuration: svnbook.red-bean.com/en/1.7/…
– michael
Nov 20 '13 at 21:04
...
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...
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...
Suppress Scientific Notation in Numpy When Creating Array From Nested List
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#exponential notation where we've told it not to!
print(a) #prints [1.01000000e-005 2.20000000e+001 1.23456780e+10]
numpy has a choice between chopping your number in half thus misrepresenting it, or forcing exponential notation, it chooses the latter.
Here comes set_printoptions(formatte...
What is default color for text in textview?
...me text color is #060001 and the in the light theme it's #060003 since API v1. See the android style class here
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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...