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...ged the variables half, one, two should be made parameters, and instead of IMPLICIT DOUBLE PRECISION (A-H, O-Z) IMPLICIT NONE should be used and all variables declared. Although IMPLICIT NONE is not standard Fortran 77, it is standard Fortran 90 and is supported by g77. Experienced Fortranners know that IMPLICIT NONE catches errors. Another defect is the use of specific intrinsic functions such as DSQRT. There is no need to use this, since the SQRT function is generic, handling both single and double precision arguments. Maybe there should R coding standards to address such issues. I ho...