Is there a function that will allow me to convert a Euclidean distance calculation for two vectors in a matrix to all the vectors in the matrix?

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Alexander Eaton 2018-3-24

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评论： Alexander Eaton 2018-3-25

采纳的回答： Von Duesenberg

The code I have currently converts any two rows of 4096 image vectors within a matrix which I have named allData. e.g.

diffs = allData(1,:) - allData(2,:) % 1 being the first row of vectors...

diffsSq = diffs .*diffs

sqrt(sum(diffsSq))

Is there a Matlab function that can maintain this calculation and iterate over all the image rows comparing each with each and then allow me to take the average(mean) of the result. I know thats a lot of calculations but hopefully it will make my result more accurate than just comparing distance between two images.

I suppose the mean is just one line of code e.g. result = mean(allData,dist) or something to that effect.

I appreciate any guidance you can share, thank you

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Answer 1

Von Duesenberg 2018-3-25

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If I understand your question correctly, this should do the trick:

mean(pdist(allData))

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Alexander Eaton 2018-3-25

thank you very much, I think once I find a way to calculate Euclidean distance over all rows, then the global mean may be the answer I require to compare against other data, but it would also be handy to have the function that can create a mean over each row and shown as a graph. I appreciate very much the help guys, thank you.

Alexander Eaton 2018-3-25