why low pass filter produced NaN

From: Xi Chang <xi.chang01_at_nyahnyahspammersnyahnyah>
Date: Mon Oct 14 2013 - 09:46:32 MDT

Hallo NCl,

I have a daily data:

Variable: data
Type: float
Total Size: 2012636160 bytes
            503159040 values
Number of Dimensions: 4
Dimensions and sizes: [time | 20256] x [level | 23] x [lat | 15] x [lon |
72]
Coordinates:
            time: [ 18..486474]
            level: [ 1..1000]
            lat: [ 20.. 90]
            lon: [ 0.. 355]
Number Of Attributes: 2
  typeConversion_op_ncl : double converted to float
  table : 128

I did a low pass filter as follow:

ncl 38> nwt = 201
ncl 39> fca = 1/90
ncl 40> ihp = 0
ncl 41> nsigma = 1.
ncl 42> wgt = filwgts_lanczos (nwt, ihp, fca, -999., nsigma)
ncl 43>
ncl 44> filter = wgt_runave_n_Wrap ( data, wgt, 0, 0 )
ncl 45> printVarSummary(filter)
ncl 46> printMinMax(filter,True)

why all the results are NaN

*(0) min=-nan max=-nan*

Thank you

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Received on Mon Oct 14 09:46:43 2013

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