> (define (eps-func p) > (let* ((lattice->cartesian p) > ... > > You probably want to change this to > > (define (eps-func p) > (let* ((p (lattice->cartesian p)) > ... >
This is really make sense to me! Now p is the cartesian coordinate, and then we can make values for x, y, and z. And it is also reasonable for the LET statement. I will try it and see the results, but it takes a long time to run the program. Thank you very much, Campbell. Regards, Simon
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