整数数组二进制数组

Question

我有一个整数数组：

a=[3,4,5,6,7]; 

我想将它与每个四个比特转换为二进制数组。对于上述整数数组我想获得以下二进制数组：

abinary=[0,0,1,1, 0,1,0,0, 0,1,0,1, 0,1,1,0, 0,1,1,1]; 

有没有快速的方法来做到这一点？

Answer 1

Matlab具有内置函数DEC2BIN。它创建一个字符数组，但很容易将其转换回数字。

%# create binary string - the 4 forces at least 4 bits 
bstr = dec2bin([3,4,5,6,7],4) 

%# convert back to numbers (reshape so that zeros are preserved) 
out = str2num(reshape(bstr',[],1))' 

Answer 2

可以使用BITGET功能：

abinary = [bitget(a,4); ... %# Get bit 4 for each number 
      bitget(a,3); ... %# Get bit 3 for each number 
      bitget(a,2); ... %# Get bit 2 for each number 
      bitget(a,1)];  %# Get bit 1 for each number 
abinary = abinary(:)';  %'# Make it a 1-by-20 array 

Answer 3

逾期答案，我知道，但是MATLAB有一个函数来做到这一点直接de2bi

out = de2bi([3,4,5,6,7], 4, 'left-msb');