Distance Matrix Matlab script

Publisher review:
Distance Matrix - fast, vectorized distance matrix calculation Returns the point-to-point distance between all pairs of points (similar to PDIST in the Statistics Toolbox, for those without it)DMAT = DISTMAT(XY) Calculates the distance matrix using an automatic optionDMAT = DISTMAT(XY,OPT) Uses the specified option to compute the distance matrix[DMAT,OPT] = DISTMAT(XY) Also returns the automatic option used by the functionInputs:XY is an NxP matrix of coordinates for N points in P dimensionsOPT (optional) is an integer between 1 and 4 representing the chosen method for computing the distance matrix (see note below)Outputs:DMAT is an NxN matrix, where the value of DMAT(i,j) corresponds to the distance from XY(i,:) to XY(j,:)OPT (optional) is an integer between 1 and 4 representing the method used to compute the distance matrix (see note below)Note:DISTMAT contains 4 methods for computing the distance matrixOPT=1 Usually fastest for small inputs. Takes advantage of the symmetric property of distance matrices to perform half as many calculationsOPT=2 Usually fastest for medium inputs. Uses a fully vectorized methodOPT=3 Usually fastest for large inputs. Uses a partially vectorized method with relatively small memory requirementOPT=4 Another compact calculation, but usually slower than the others Requirements: · MATLAB Release: R2007a
Operating system:
Windows / Linux / Mac OS / BSD / Solaris

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