calculate angle between 2 n-dimentional vectors with missing data

I have a matrix with the rows containing the n dimensions of 2 vectors. I want to calculate the angle of difference for each row. The issue I have is that some of the cells are missing and so I don't want either of the vectors values for that dimension in the row to go into the calculation.

Answer 1

[Matt J]

So your matrix A is n x 2 and your the missing elements are NaNs? If so,

        idx = all(~isnan(A),2); %EDITED
        B=A(idx,:);

        norms = prod(sqrt(sum(B.^2)));
        dotprod= sum(prod(B,2));

        result = acosd( dotprod/norms), %angleDiff

[Roger Stafford]

Matt, I think you mean

   idx = all(~isnan(A),2);

[Matt J]

Right you are, Roger. I've edited accordingly.