test_akima.f90
1.1 KB
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program akima
use fvn
implicit none
integer :: nbpoints,nppoints,i
real(8),dimension(:),allocatable :: x_d,y_d,breakpoints_d
real(8),dimension(:,:),allocatable :: coeff_fvn_d
real(8) :: xstep_d,xp_d,ty_d,fvn_y_d
open(2,file='fvn_akima_double.dat')
open(3,file='fvn_akima_breakpoints_double.dat')
nbpoints=30
allocate(x_d(nbpoints))
allocate(y_d(nbpoints))
allocate(breakpoints_d(nbpoints))
allocate(coeff_fvn_d(4,nbpoints))
xstep_d=20./dfloat(nbpoints)
do i=1,nbpoints
x_d(i)=-10.+dfloat(i)*xstep_d
y_d(i)=dsin(x_d(i))
write(3,44) x_d(i),y_d(i)
end do
close(3)
call fvn_akima(nbpoints,x_d,y_d,breakpoints_d,coeff_fvn_d)
nppoints=1000
xstep_d=22./dfloat(nppoints)
do i=1,nppoints
xp_d=-11.+dfloat(i)*xstep_d
ty_d=dsin(xp_d)
fvn_y_d=fvn_spline_eval(xp_d,nbpoints-1,breakpoints_d,coeff_fvn_d)
write(2,44) xp_d,ty_d,fvn_y_d
end do
close(2)
deallocate(coeff_fvn_d,breakpoints_d,y_d,x_d)
write(*,*) "All done, plot results with gnuplot using command :"
write(*,*) "pl 'fvn_akima_double.dat' u 1:2 w l,'fvn_akima_breakpoints_double.dat' w p"
44 FORMAT(4(1X,1PE22.14))
end program