DOUBLE PRECISION function fun(x,iuser) ***** normalized functions ******* DOUBLE PRECISION x, t, alpha, beta, pi integer iuser c on input, x in [0,1] c t in [-1,1], for convenience in typing t = 2*x-1 pi = 4*DATAN(1.D0) alpha = 1000 beta = 1/pi if(iuser.lt.1.or.iuser.gt.22)then print *,"bad function code ",iuser stop end if goto (1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16, 17,18,19,20,21,22), + iuser 1 continue fun = acosh(1+99*x)/acosh(100.D0) return 2 continue fun = .5D0+.5D0*asin(-.99D0+1.98D0*x)/asin(.99D0) return 3 continue fun = .5D0+.5D0*asinh(-100+200*x)/asinh(100.D0) return 4 continue fun =.5D0+.5D0*DATAN(-100+200*x)/DATAN(100.D0) return 5 continue fun = .5D0+.5D0*atanh(-.99D0+1.98D0*x)/atanh(.99D0) return 6 continue fun = (cosh(t)-1)/(cosh(1.D0)-1) return 7 continue fun = x**1.6D0 return 8 continue fun =(DEXP(t)-DEXP(-1.D0))/(DEXP(1.D0)-DEXP(-1.D0)) return 9 continue fun =(DEXP(t)-DEXP(-1.D0)+max(0.D0,alpha*(t-beta)))/ \$ (DEXP(1.D0)-DEXP(-1.D0)+max(0.D0,alpha*(1.-beta))) return 10 continue fun = (erf(alpha*(x-beta))+DEXP(x*x))/ \$ (erf(alpha*(1.-beta))+DEXP(1.D0)) return 11 continue fun = (tanh(alpha*t)+DEXP(t*t))/ \$ (tanh(alpha)+DEXP(1.D0)) return 12 continue fun =DEXP(-alpha*x) return 13 continue fun = max(0.D0,alpha*(t-beta))/(alpha*(1.-beta)) return 14 continue fun = (log(.01D0+99.99D0*x)-log(.01D0))/ \$ (log(.01D0+99.99D0)-log(.01D0)) return 15 continue fun = .5D0+.5D0*DSIN(2*pi*x) return 16 continue fun = .5D0+.5D0*sinh(t)/sinh(1.D0) return 17 continue fun =DSQRT(t+1)/DSQRT(2.D0) return 18 continue fun = .5D0+.5D0*(erf(100*t)/erf(100.D0)-t) return 19 continue fun = .5D0+.5D0*(tan(-1.5D0+3*x)/tan(1.5D0)) return 20 continue fun = .5D0+.5D0*tanh(alpha*t) return 21 continue if(x.eq.0)then fun = 0 else fun = -exp(1.D0)*x*log(x) end if return 22 continue fun = .5D0+.5D0*erf(alpha*(x-beta)) return end