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35 lines
602 B
Fortran
35 lines
602 B
Fortran
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subroutine fitcal(x,y,r,iz,a,b,sigmaa,sigmab,rms)
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implicit real*8 (a-h,o-z)
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real*8 x(iz),y(iz),r(iz)
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sx=0.d0
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sy=0.d0
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sxy=0.d0
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sx2=0.d0
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do i=1,iz
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sx=sx + x(i)
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sy=sy + y(i)
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sxy=sxy + x(i)*y(i)
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sx2=sx2 + x(i)*x(i)
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enddo
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delta=iz*sx2 - sx*sx
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a=(sx2*sy - sx*sxy)/delta
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b=(iz*sxy - sx*sy)/delta
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sq=0.d0
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do i=1,iz
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r(i)=y(i) - (a + b*x(i))
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sq=sq + r(i)**2
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enddo
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rms=0.
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sigmaa=0.
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sigmab=0.
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if(iz.ge.3) then
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rms=sqrt(sq/(iz-2))
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sigmaa=sqrt(rms*rms*sx2/delta)
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sigmab=sqrt(iz*rms*rms/delta)
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endif
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return
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end subroutine fitcal
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