how to compare two different matrix and set a counter to calculate how many rows matches with all its columns??

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wasima tammi 2015-3-20

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%   count1=0;
%for i=1:size(p1)
%     for j=1:size(q1)
%     if find ( p1(i,:)==q1(j,:))
%         count1=count1 + 1;
%     
% 
%     end
%     end
% end

the counter is giving wrong count and how to adjust it..and when i m using here a variable instead of counter then the command prompt returns that it was an undefined function or variable...

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Answer 1

Image Analyst 2015-3-20

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Why not simply do

% Get number of rows and columns.
[rows, columns] = size(p1);
% Find number of columns where each element matches.
numMatchingElements = sum(sum(p1==q1) == rows)

?

It's vectorized and uses only 1 line of code (or 2 if you don't know the number of rows in advance).

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Answer 2

Roger Stafford 2015-3-20

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You are misusing the 'if' function. Where you write

if find ( p1(i,:)==q1(j,:))

the condition will be considered true if any of the elements match, not just if they all match. You should write this for a complete match:

if all(p1(i,:)==q1(j,:))

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wasima tammi 2015-3-20

thanks for ur answer.. but the thing is that when i run the program it shows that the count is undefined variable or function which is actually not.. for this what i can do??

Answer 3

James Tursa 2015-3-20

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/184270-how-to-compare-two-different-matrix-and-set-a-counter-to-calculate-how-many-rows-matches-with-all-it#answer_172131

The above code is all commented out (begins with % and appears green in the editor). Is this the actual code you are trying to run? (It won't run because it is commented out)