How to get pdist() values of all the rows of a matrix with respect to a row of the same matrix?

Say, for example, I have a matrix x =[0 0; 1 0; 0 2; 3 0]. If I use pdist(x), Matlab will output all the Euclidean distance between every row of the matrix. But I want the distance with respect to only the first row. Output, something like [0; 1; 2; 3]. I am aware that I could select the first few entries of the result from pdist(x) to get the matrix as desired. But, as the size of matrix x increases there will be a lot of unnecessary computations happening, which I would like to avoid. I realize that I could have probably written a function instead of asking here. Let me know if there is a workaround to this problem, which will be beneficial in the future. Thanks.

Answer 1

[Nithin Banka]

diffX = X - X(1, :);
yourReqOutput = sqrt(sum(diffX.^2, 2));%first row will be 0 as it is distance from itself.