strange behavior

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Dear NCL users,

I'm having a strange behavior of mixhum_ptrh function and my
user-defined function. Both functions give the specific humidity given
temperature, pressure and relative humidity. I printed their results to
compare them, but I'm getting this:

ncl 1> p = 1000.
ncl 2> tk = 18. + 273.15
ncl 3> rh = 46.5
ncl 4> print(qSpec(tk,rh,p)+" "+mixhum_ptrh (p, tk, rh, 2))
(0) 5.96583e-05 -0.00771059
ncl 5> print(qSpec(tk,rh,p)+" "+mixhum_ptrh (p, tk, rh, 2))
(0) nan -7.65217e-05
ncl 6> print(qSpec(tk,rh,p)+" "+mixhum_ptrh (p, tk, rh, 2))
(0) -1.73974 -7.72574e-07
ncl 7> print(qSpec(tk,rh,p)+" "+mixhum_ptrh (p, tk, rh, 2))
(0) 1.86416e-06 8.26161e-10

As you can see, the values isn't the same in successive calls.
I'm using NCL 4.3.0.

Do someone already seen this?

Thanks,

Mateus
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Received on Tue Jun 26 2007 - 11:49:15 MDT