Date: Thu Jul 05 2012 - 14:43:12 MDT
Hi,
I was recently using NCL to interpolate some economic data. NCL's
interpolation functions compute weighted averages, but I need weighted
sums. I initially used bin_sum. The output made no sense. I looked at
the range of the data and the lower limit was very nearly the missing
value (-999). This data set contained missing values and I suspected
that bin_sum was failing to recognize and ignore these missing values.
To my surprise, it even appears in the absence of missing values. I
wrote up a small script to illustrate the problem. Attached is my script
with the output.
Chad
Copyright (C) 1995-2012 - All Rights Reserved
University Corporation for Atmospheric Research
NCAR Command Language Version 6.1.0-beta
The use of this software is governed by a License Agreement.
See http://www.ncl.ucar.edu/ for more details.
Variable: data_in
Type: float
Total Size: 64800 bytes
16200 values
Number of Dimensions: 2
Dimensions and sizes: [lat | 90] x [lon | 180]
Coordinates:
lat: [-89..89]
lon: [ 1..359]
Number Of Attributes: 1
_FillValue : -999
Variable: data_out
Type: float
Total Size: 41472 bytes
10368 values
Number of Dimensions: 2
Dimensions and sizes: [lat | 144] x [lon | 72]
Coordinates:
lat: [-89.375..89.375]
lon: [2.5..357.5]
Number Of Attributes: 1
_FillValue : -999
(0) min=-42.8553 max=40.2627
(0) min=-1063.25 max=-931.461
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- text/x-ncl attachment: bin_sum_bug.ncl
