makesurf.m

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function [X,Y,Z]=makesurf(data,nx)
% [X,Y,Z]=makesurf(data,nx) converts the 3D data file data into
% three matices as need by surf(). nx tells how long the row of the
% output matrices are

  [m,n]=size(data);

  n=0;
  for i=1:nx:m,
    n = n+1;
    X(:,n) = data(i:i+nx-1,1);
    Y(:,n) = data(i:i+nx-1,2);
    Z(:,n) = data(i:i+nx-1,3);
  end;