Using angdiff with pdist2 for angle data

Question

David Gillcrist 2023-10-5

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2029729-using-angdiff-with-pdist2-for-angle-data

回答： David Gillcrist 2023-10-5

I have two sets of data phi1 and phi2, and I'd like to know what the pairwise distances are for these two sets. I've tried applying the funtion pdist2 with the added argument angdiff but I get the following error

pdist2(phi1,phi2,@angdiff)

Error using pdist2

Error evaluating distance function 'angdiff'.

Caused by:

Unable to perform assignment because the size of the left side is 1-by-1 and the size of the right side is 1-by-3.

Any idea on how to get around this?

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Answer 1

David Gillcrist 2023-10-5

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2029729-using-angdiff-with-pdist2-for-angle-data#answer_1326919

在 MATLAB Online 中打开

I found a solution. I defined a new function called

delta = myAngDiff(alpha,beta)

which takes is expected to take a single value for alpha and a vector for beta and use a for loop to iterate through all the difference between alpha and each intry in beta. Here it is:

function out = myAngDiff(alpha,beta)
    out = zeros(length(beta),1);
    for i=1:length(beta)
        out(i) = abs(angdiff(alpha,beta(i)));
    end
end