Euclidean distance between two point clouds

Given point cloud A and B, get the euclidean distance of every point in B to the nearest point in A.

% Calculate the euclidean distance for every point in sample point cloud to
% the closest point in the reference point cloud (number of columns must
% match)
% INPUT:
% reference = M x N matrix
% sample = P x N matrix

% OUTPUT:
% distMat = P x N matrix