find missing elements in a matrix

Question

Rashmil Dahanayake 2014-9-19

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/155433-find-missing-elements-in-a-matrix

评论： Rashmil Dahanayake 2014-9-23

Hi, I have a matrix represents code numbers.

    A=[1 2 3 6 7 45 46 47 53 78 80];
    B=[55.23                ,74.22]; % B is if same length of A, and contains element by element corresponding data

Say the numbers should be in the range 1:80.

How can I find the numbers which are missing in A.

eg in above case, the expected answer is missing=[4 5 8 9 ... 79]

Then to print a text file

experiment 1 results 55.23
experiment 2 results 442.23 
experiment 4 data missing
.
.
experiment 79 data missing
experiment 80 results 442.2

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Stephen23 2014-9-19

编辑：Stephen23 2014-9-19

Your edit added "Then print to a text file". This is:

A separate topic.
Easy to solve yourself using any search engine.

Other users here are not paid to write your code for you, but will happily help if there is something that needs explaining or clarification.

Rashmil Dahanayake 2014-9-23

^ non technical comment. Scroll down to read relevant answers.

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Answer 1

Stephen23 2014-9-19

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https://ww2.mathworks.cn/matlabcentral/answers/155433-find-missing-elements-in-a-matrix#answer_152234

在 MATLAB Online 中打开

Try setxor :

setxor(A,1:80)

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Stephen23 2014-9-19

See also Fabio Freschi's answer using setdiff .

Rashmil Dahanayake 2014-9-20

see my updated answer incorporating Fabios

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Answer 2

Fabio Freschi 2014-9-19

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https://ww2.mathworks.cn/matlabcentral/answers/155433-find-missing-elements-in-a-matrix#answer_152236

在 MATLAB Online 中打开

Try this

 A=[1 2 3 6 7 45 46 47 53 78 80];
 all = 1:80;
 missing = setdiff(all,A);

Fabio

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Rashmil Dahanayake 2014-9-19

this method also works

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Answer 3

Rashmil Dahanayake 2014-9-19

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/155433-find-missing-elements-in-a-matrix#answer_152244

编辑：Rashmil Dahanayake 2014-9-19

在 MATLAB Online 中打开

Full Answer for my question asked previously. In case if someone might find it usefull

A=1:3:20;  % in complete data
B=1:20;    % Full index
missing = setdiff(B,A); % check for missing elements
A=strread(num2str(A),'%s')'; 
for ms=1:length(missing)
A=horzcat(A(1:(missing(ms)-1)),'misplaced results',A(missing(ms):end));
end
%A  % verify answer