如何在MATLAB中用其他数字替换矩阵的某些元素? [英] How can i replace some elements of a matrix by other numbers in MATLAB?

问题描述

我有一个由1000个二进制元素组成的矩阵，如Matlab中所示:

I have a matrix consists of 1000 binary elements like below in Matlab:

M = 11001100101100001011010001001100101000101110010110001‌10000101010110010111‌0111001 ...

M = 11001100101100001011010001001100101000101110010110001‌​10000101010110010111‌​0111001...

我如何分割每3个元素并用另一个元素替换它们.例如000 By 000000，110 By 000001，001 By 00001，100 By 0001，101 By 001，010 By 01，011 By 1.

How i can split every 3 elements and replace them By another elements. for example 000 By 000000, 110 By 000001, 001 By 00001, 100 By 0001, 101 By 001, 010 By 01, 011 By 1.

我使用了这种方法，但是不起作用.怎么了?

I used this method but it doesn't work. What is wrong with it?

  Lookup_In  = [  000      110      001    100    101  010  011 ] ;
  Lookup_Out = {'000000','000001','00001','0001','101','01','1' } ;
  StrOut = repmat({'Unknown'},size(M)) ;
  [tf, idx] =ismember(M, Lookup_In) ;
  StrOut(tf) = Lookup_Out(idx(tf))

推荐答案

M此处是使用1000二进制元素随机生成的:

M here is randomly generated with 1000 binary elements:

rng(1);
M = randi([0 1], 1,1000);
fprintf('%d\n',M)

首先，我对M进行零填充以达到3的长度倍数.其次，我将矩阵重新排列为每行3个元素的矩阵，并应用了Lookup_Out.

First, I zeropadded M to reach a length multiple of 3. Second, I reshaped the array in a matrix with 3 elements of each row and applied Lookup_Out.

c = mod(numel(M),3);
M = [M,zeros(1,3-c)]; %zeropadding to multiple of 3

M = reshape(M,[3,numel(M)/3])';

Lookup_In  = [  000      110      001    100    101  010  011 ] ;
Lookup_Out = {'000000','000001','00001','0001','101','01','1' } ;
StrOut = repmat({''},[1,size(M,1)]);

for r=1:size(M,1)
    StrOut{r} = Lookup_Out{str2double(sprintf('%d',M(r,:))) == Lookup_In};
end

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