生成比特矩阵 [英] Generate matrix of bits

问题描述

我想借此整数 N 确定的位数在我的沟通code和矢量定义，我分配给位字母 0：N-1 ，并输出包含字母符号每个状态矩阵/单元阵列，例如：

I would like to take an integer n defining the number of bits in my communication code and a vector defining the alphabet I am assigning to bits 0:n-1, and output a matrix/cell array containing the alphabetic notation for each state, i.e.:

function M = mycommarray(3,[-1,1])

产生

M = [{-1,-1,-1}, {-1,-1,1}...]

我试着用这样一个简单的方法DEC2BIN（0：7,3），但似乎没有成为一个快速的方法，使零到 1 秒。

I tried doing this an easier way with dec2bin(0:7,3), but there doesn't seem to be a quick way to make the zeros into -1s.

有任何接近prepackaged做这个？在这种情况下，我不希望任何人，使之成为我（与家庭作业）。

Is there anything close to prepackaged that does this? In this case I don't want anyone to make it for me (related to homework).

推荐答案

DEC2BIN 其实并不是来解决这个问题，因为它的结果是一个字符串数组的最佳方式（即的字符的矩阵），其中每个数字是一个字符。如果你想 - 1。重新present逻辑0，这将是两个字符，它引入的问题。

dec2bin is actually not the best way to approach the problem, because its result is an array of strings (i.e a matrix of characters), where each digit is a character. If you want '-1' to represent a logical "0", that would be two characters, and it introduces problems.

考虑使用 bitget 的替代方法。利用夏嘉曦的建议的，请执行以下操作：

Consider an alternative method with bitget. Making use of Shai's suggestion, do the following:

[bits, values] = meshgrid(1:3, 0:7);
M = 2 * bitget(values, bits) - 1;

本会产生你想要什么：

The will produce what you want:

M =
    -1    -1    -1
     1    -1    -1
    -1     1    -1
     1     1    -1
    -1    -1     1
     1    -1     1
    -1     1     1
     1     1     1

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