如何将整数转换为二进制向量？

问题描述

如何使用R将整数转换为二进制向量？

How to convert an integer number into binary vector using R?

例如：

number <- 11
[1] 1 0 1 1

如果我需要将整个数字向量（最小值= 0，最大值= 300）转换为二进制矩阵，那么最快的转换方法是什么（使用R代码或包中的一些现有函数）？

what is the fastest possible method of conversion (using R code or some existing functions from packages) if I need to convert whole vector of numbers (minimum value = 0, maximum =300) into binary matrix ?

推荐答案

有 intToBits 函数将任何整数转换为32个raw的向量，所以你可以这样做：

There's the intToBits function that converts any integer to a vector of 32 raws, so you can do this:

decimals <- c(3,5,11,4)
m <- sapply(decimals,function(x){ as.integer(intToBits(x))})
m

> m
      [,1] [,2] [,3] [,4]
 [1,]    1    1    1    0
 [2,]    1    0    1    0
 [3,]    0    1    0    1
 [4,]    0    0    1    0
 [5,]    0    0    0    0
 [6,]    0    0    0    0
 [7,]    0    0    0    0
 [8,]    0    0    0    0
 [9,]    0    0    0    0
[10,]    0    0    0    0
[11,]    0    0    0    0
[12,]    0    0    0    0
[13,]    0    0    0    0
[14,]    0    0    0    0
[15,]    0    0    0    0
[16,]    0    0    0    0
[17,]    0    0    0    0
[18,]    0    0    0    0
[19,]    0    0    0    0
[20,]    0    0    0    0
[21,]    0    0    0    0
[22,]    0    0    0    0
[23,]    0    0    0    0
[24,]    0    0    0    0
[25,]    0    0    0    0
[26,]    0    0    0    0
[27,]    0    0    0    0
[28,]    0    0    0    0
[29,]    0    0    0    0
[30,]    0    0    0    0
[31,]    0    0    0    0
[32,]    0    0    0    0

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