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How to combine multiple conditions to subset a data-frame using “OR”?
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my.data.frame <- subset(data , V1 > 2 | V2 < 4)
An alternative solution that mimics the behavior of this function and would be more appropriate for inclusion within a function body:
new.data <- data[ which( data$V1 > 2 | data$V2 < 4) , ]
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What is the difference between ManualResetEvent and AutoResetEvent in .NET?
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Declare slice or make slice?
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edited May 23 '17 at 12:34
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answered Aug 28 '14 at 8:21
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autolayout - make height of view relative to half superview height
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This is now possible in IB as of [at least] Xcode 5.1.1. Although it took me sometime to figur...
Calling clojure from java
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Update: Since this answer was posted, some of the tools available have changed. After the orig...
How to enable local network users to access my WAMP sites?
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How do you add an array to another array in Ruby and not end up with a multi-dimensional result?
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17 Answers
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Center content of UIScrollView when smaller
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edited May 8 '14 at 12:55
answered May 22 '10 at 7:25
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C语言结构体里的成员数组和指针 - c++1y / stl - 清泛IT社区，为创新赋能！
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}复制代码
你编译一下上面的代码，在VC++和GCC下都会在14行的printf处crash掉你的程序。@Laruence 说这个是个经典的坑，我觉得这怎么会是经典的坑呢？上面这代码，你一定会问，为什么if语句判断的不是f.a？而是f.a里面的数组？...
c++提取复数的实部和虚部 - C/C++ - 清泛网 - 专注C/C++及内核技术
...p, 0, sizeof(COMPLEX));
char buf[MAX_BUF_LEN];
int signPos = -1, // +/-号位置
iPos = -1; // 结尾的i的位置
for (int i = len-1; i >-1; i--)
{
if ('i' == strCplx[i])
iPos = i;
else if ('+' == strCplx[i] || '-' == strCplx[...