gfortran -ffixed-line-length-none -O3 -o symbolic_regress1.x symbolic_regress1.f
gfortran -ffixed-line-length-none -O3 -o symbolic_regress2.x symbolic_regress2.f
gfortran -ffixed-line-length-none -O3 -o symbolic_regress3.x symbolic_regress3.f
