How do I compare two sets of numerical strings character by character on Matlab ?

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Hannah 2014-5-8

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编辑： Jos (10584) 2014-5-12

采纳的回答： Star Strider

I want to compare two sets of numerical data character by character e.g.

1011101 and 1011000

so that matlab will show that the 5 and 7th characters are different (0000101). I want to then count the number of differences (2).

If the terminology I use is wrong, please ignore that and focus on the example I have given to communicate what I want to do.

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José-Luis 2014-5-8

在 MATLAB Online 中打开

To import excel data to Matlab:

doc xlsread

A somewhat faster option:

http://www.mathworks.com/matlabcentral/answers/94822

Hannah 2014-5-10

编辑：Hannah 2014-5-10

Thanks,

I'm having some trouble though because the numbers are too long so if I use xlsread, the number is coming up as NaN. Any ideas on how to solve this?

p.s. I managed to upload the file as a cvs manually, but then Matlab is having trouble processing the logical array ~=

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Star Strider 2014-5-8

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在 MATLAB Online 中打开

Using MATLAB binary operations (considering the inputs — a and b here — are numbers:

a = 1011101;
b = 1011000;
A = num2str(a,'%d')
B = num2str(b,'%d')
ai = int16(bin2dec(A))
bi = int16(bin2dec(B))
C = dec2bin(bitxor(ai,bi))
HamDist = length(findstr(C,'1'))        % Hamming Distance

produces:

HamDist =
       2

What you want is known as the Hamming Distance between two binary numbers.

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Jos (10584) 2014-5-8

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/128936-how-do-i-compare-two-sets-of-numerical-strings-character-by-character-on-matlab#answer_136140

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a = '1011101'
b = '1011000'
q = a~=b % a logical array, true for locations where a and b differ
n = nnz(q) % count the number of non zeros (true)

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Sagar Damle 2014-5-10

编辑：Sagar Damle 2014-5-10

Hannah,though you have accidentally clicked on Star's answer,now you can vote for Jos by clicking on '0 votes' written below Noddy's picture!This will add two points to Jos's reputation!