云在青天水在瓶

阅读代码时如果看不懂从下面几个方面考虑问题

跨平台编程不同编译器对不同操作系统定义了标识

Env: Mac OSX 10.9.2 c++11#include <iostream>#include <vector>int main (int argc, char *argv[]){ int n = 5; std::vector<int> nv(n, -1); std::vector<int> nv1, nv2, nv3, nv4, nv5; nv1.

list追加f <- list()d <- c(1,2)e <- c(3,4)f <- list(d, e)g <- c(7,8) f <- c(list(g), f) # 追加到前面h <- c(9, 0)f <- c(f, list(h)) # 追加到后面data.frame追加f <- data.frame()...