subroutine does not run

[wassim2015]

Hi, i tried to write a program to calculate numerical derivative in main program + one subroutine
but this subroutine does not run. please help me.
---------------------------------------------------
program exemple
implicit none
INTEGER::i,j
integer,parameter::N=142
real:beta,Dgamma
real,dimension(N)::beta,gamma
real,dimension(N,N)::H,dH

OPEN(unit=10,file='MP')
open(unit=30,file='resultats')

WRITE(30,200)'beta','gamma','H','dH'

DO i=1,N
DO j=1,N
READ(10,*)beta(i),gamma(j)
H(i,i)=0
H(i,j)=H(i,j)+(beta(i)*sin(gamma(j)))
WRITE(30,300)beta(i),gamma(j),H(i,j)
enddo
enddo
200 format(a10, a10, a10, a10,a10)
300 format(f10.2,f10.2,f10.2)

call deriv(H,dH,beta,gamma,Dbeta,Dgamma)

end program exemple

subroutine deriv(H,dH,beta,gamma,Dbeta,Dgamma)

INTEGER::i,j
real:beta,Dgamma
integer,parameter::N=142
real,dimension(N)::beta,gamma
real,dimension(N,N)::H,dH

Dbeta=beta(2)
Dgamma=gamma(3)

open(unit=50,file='deriv')

DO i=1,N-1
DO j=2,N-1

dH(i,j)=0
dH(i,j)=(H(i,j+1)-H(i,j-1))/(2*Dgamma)

enddo
enddo

DO i=1,N-1
DO j=2,N-1

WRITE(50,400)beta(i),gamma(j),H(i,j),dH(i,j)

enddo
enddo

CLOSE(10)
close(30)

400 format(f10.2,f10.2,f10.2,f10.2)
end subroutine deriv
--------------------------------------------------
data file: MP
0.00 0.00
0.05 0.00
0.05 6.00
0.05 12.00
0.05 18.00
0.05 24.00
0.05 30.00
0.05 36.00
0.05 42.00
0.05 48.00
0.05 54.00
0.05 60.00
0.10 0.00
0.10 6.00
0.10 12.00
0.10 18.00
0.10 24.00
0.10 30.00
0.10 36.00
0.10 42.00
0.10 48.00
0.10 54.00
0.10 60.00
0.15 0.00
0.15 6.00
0.15 12.00
0.15 18.00
0.15 24.00
0.15 30.00
0.15 36.00
0.15 42.00
0.15 48.00
0.15 54.00
0.15 60.00
0.20 0.00
0.20 6.00
0.20 12.00
0.20 18.00
0.20 24.00
0.20 30.00
0.20 42.00
0.20 48.00
0.20 54.00
0.20 60.00
0.25 0.00
0.25 6.00
0.25 12.00
0.25 18.00
0.25 24.00
0.25 30.00
0.25 36.00
0.25 42.00
0.25 48.00
0.25 54.00
0.25 60.00
0.30 0.00
0.30 6.00
0.30 12.00
0.30 18.00
0.30 24.00
0.30 30.00
0.30 36.00
0.30 42.00
0.30 48.00
0.30 54.00
0.30 60.00
0.35 0.00
0.35 6.00
0.35 12.00
0.35 18.00
0.35 30.00
0.35 36.00
0.35 42.00
0.35 48.00
0.35 54.00
0.35 60.00
0.40 0.00
0.40 6.00
0.40 12.00
0.40 18.00
0.40 24.00
0.40 30.00
0.40 36.00
0.40 42.00
0.40 48.00
0.40 54.00
0.40 60.00
0.45 0.00
0.45 6.00
0.45 12.00
0.45 18.00
0.45 24.00
0.45 30.00
0.45 36.00
0.45 42.00
0.45 48.00
0.45 54.00
0.45 60.00
0.50 0.00
0.50 6.00
0.50 12.00
0.50 18.00
0.50 24.00
0.50 30.00
0.50 36.00
0.50 42.00
0.50 48.00
0.50 54.00
0.50 60.00
0.55 0.00
0.55 6.00
0.55 12.00
0.55 18.00
0.55 24.00
0.55 30.00
0.55 36.00
0.55 42.00
0.55 48.00
0.55 54.00
0.55 60.00
0.60 0.00
0.60 6.00
0.60 12.00
0.60 18.00
0.60 24.00
0.60 30.00
0.60 36.00
0.60 42.00
0.60 48.00
0.60 54.00
0.60 60.00
0.65 0.00
0.65 6.00
0.65 12.00
0.65 18.00
0.65 24.00
0.65 30.00
0.65 36.00
0.65 42.00
0.65 48.00
0.65 54.00
0.65 60.00

 

[xwb]

What exactly do you mean by it doesn't run? It doesn't compile or it runs giving the wrong results. If the latter, what values are you expecting?