ognik
Joined: 04 Feb 2015
Posts: 19
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 Posted: Fri Nov 13, 2015 11:38 pm Post subject: negative number raised to non integer power |
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Hi - short story is the Win10 upgrade got stuck in an endless auto-repair loop, had to rebuild my PC to win 7 again. Reinstalled SilverFrost - but a program that ran without error before, now fails with 'negative number raised to non integer power' error.
I am pretty sure I haven't changed the program since I last ran it before the rebuild/reinstall!
So is there a setting I might have forgotten?
Code where it fails is below, alfa = 0, n=4
fails on the term4 calc - I fixed it with making the power 2 and not 2.0 - but I'm sure it was 2.0 before ....
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| Code: |
!----- Find KE NxN matrix ----
do i=1, n ! rows
do j=1, n ! cols
If (i.eq.j) then
term1 = -1.0/12.0
term2 = (((2.0*n)+alfa+1.0)*(alfa+4.0))/(6.0*(alfa+1.0)*x(i))
term3 = ((alfa+2.0)*(alfa-5.0))/(6.0*(x(i)**2.0))
T(i,i) = term1+term2+term3
else
term1 = ((-1)**(i-j))/(sqrt(x(i)*x(j)))
term2 = (n/(alfa+1.0)) + (1.0/2.0)
term3 = (1.0/x(i))+(1.0/x(j))
term4 = (x(i)+x(j))/((x(i)-x(j))**2.0)
T(i,j) = term1*(term2 - term3 + term4)
end if
end do
end do
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Thanks |
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JohnCampbell
Joined: 16 Feb 2006
Posts: 2554
Location: Sydney
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| Posted: Sat Nov 14, 2015 8:55 am Post subject: |
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You did not provide a definition of x(4), but I could reproduce your problem.
Changed "**2.0" to "**2" and the problem went away with my assumed x.
Could it be a change in FTN95 than **2.0 is no longer changed to **2 (assuming this was once the case, as I do remember this being discussed before.)
John |
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