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Drop unused factor levels in a subsetted data frame
...columns in a dataframe, you can use:
subdf <- subset(df, numbers <= 3)
subdf[] <- lapply(subdf, function(x) if(is.factor(x)) factor(x) else x)
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console.log javascript [Function]
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Benjamin
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answered Feb 27 '12 at 6:26
PaulPaul
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Xcode Command /usr/bin/codesign failed with exit code 1 : errSecInternalComponent
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edited Mar 30 '19 at 23:36
Ben Leggiero
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C++ error: undefined reference to 'clock_gettime' and 'clock_settime'
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answered Mar 10 '10 at 15:38
Dmitry YudakovDmitry Yudakov
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Should I use AppDomain.CurrentDomain.BaseDirectory or System.Environment.CurrentDirectory?
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edited Mar 28 '13 at 5:58
Mike Chamberlain
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How can I escape double quotes in XML attributes values?
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Explicit and a longer naming convention is better than acronyms or shortened one when naming variables, function, attributes, or etc.; I'll ...
Android icon vs logo
...true) in your activity.
Source: http://developer.android.com/sdk/android-3.0.html#api
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Comments in .gitignore?
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713
Yes, you may put comments in there. They however must start at the beginning of a line.
cf. htt...
Windows x64编程中寄存器的使用 - C/C++ - 清泛网 - 专注C/C++及内核技术
... Second FP argument
XMM2
Volatile
Third FP argument
XMM3
Volatile
Fourth FP argument
XMM4:XMM5
Volatile
Must be preserved as needed by caller
XMM6:XMM15
Nonvolatile
Must be preserved as needed by callee.
1. 传递参数
在 Win64 里使用...
App Inventor 2 BLE扩展源码分析 - WriteBytes vs WriteStrings 23字节硬编...
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- BluetoothLE.java（2975行）-- 公开API层
- BluetoothLEint.java（3165行）-- 内部实现层
二、核心发现：23字节硬编码限制
2.1 WriteStrings 的写入路径
位于 BLEWriteOperation.write() 方法第678-690行：
if (mClass == String.class) {
byte[]...