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how can we find the percentage of similarity between two matrices ??

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NAVNEET NAYAN
NAVNEET NAYAN 2017-2-22
回答： Walter Roberson 2017-2-22
i have two 1280-by-720 matrices. after looking the elements of those two matrices, both appears nearly equal. please tell me how can i find the percentage of similarity or equality between two matrices. i have found correlation coefficient method to find similarity between those two matrices, so can anyone suggest any different way to do the same.
Navneet Nayan

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回答（2 个）

KSSV
KSSV 2017-2-22
How about the below logic?
m = 1280 ; n = 720 ; % your dimensions
p = 1000 ;
a = rand(m,n) ; % a random matrix
b = rand(m,n) ; % a random matrix
idx = randsample(1:m*n,p) ; % deliberately making p elements in a and b equal
a(idx) = b(idx) ;
%
k = a==b ; % get the equal elements
iwant = sum(k(:)); % total number of equal elements, I will get it as p (i fixed it earlier)
percentage = iwant/(m*n)*100
In your case, a and b are matrices which already have equal elements. If == is not working try with ismemebr, ismemebrtol.
Walter Roberson
Walter Roberson 2017-2-22
MSE, mean squared error. You might be able to use immse()

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