Can _FillValue as NaN work as i/p to functions?

Greetings,

Another _FillValue question:

Can I set _FillValue to be NaN?

Certainly, this script does what you would expect:

x = new ((/3,3/), float)
x@_FillValue = sqrt(-1.0)
x(0,0) = 42.0
x(1,2) = 24.0
print(x)

Variable: x
Type: float
Total Size: 36 bytes
            9 values
Number of Dimensions: 2
Dimensions and sizes: [3] x [3]
Coordinates:
Number Of Attributes: 1
  _FillValue : -nan
(0,0) 42
(0,1) -nan
(0,2) -nan
(1,0) -nan
(1,1) -nan
(1,2) 24
(2,0) -nan
(2,1) -nan
(2,2) -nan

[Not sure how it knows NaN is negative!!]

The question is whether this will propagate meaningfully through
functions such as wrf_user_interp(), gsn_contour_map() and
gsn_csn_vector() ?

For the record, the plot is intended to display wind vectors at a
pressure level that happens to be below the surface. A seemingly ideal
use for NaN :-)

Thanks and Best Regards

PaulS

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Received on Mon Jun 18 12:12:39 2012