lterp with PDEF

Rauscher Sara A srausche at ICTP.IT
Wed May 28 12:12:07 EDT 2008

I am trying to interpolate two variables from two different files. For
both files I am using a DDF to read in the netCDF since the data are on
a rotated lat-lon projection (the files contain RCM data). I am using
the latest release of grads, v 2.0a2 (see the q config info at the bottom).

The data look perfectly fine when I display them from each file,  but
when I try to use lterp, I get the following error:

ga-> d lterp(mrso.1,mrso.2)
Notice:  Automatic Grid Interpolation Taking Place
*** glibc detected *** malloc(): memory corruption: 0x084757c8 ***
Abort (core dumped)

Does anyone have any ideas as to what's wrong?

Here are the DDFs for each file. I wasn't sure how to set xdef and ydef
in the DDFs.
 file 1:
dtype netcdf
undef -1.e+30
pdef 97 91 ROTLL -162. 39.25 .44 .44 -23.37 -21.45
xdef  91 linear   -9.61  0.44
ydef  97  linear   34.70  0.44
zdef 1 levels 1008.43
tdef  1 linear  00Z15AUG2002 1mo
vars 1
mrso=>mrso      0 t,y,x soil moisture

file 2:
DSET ^../../25km/MM/
dtype netcdf
undef -1.e+30
pdef 201 193 ROTLL -162. 39.25 .22 .22 -24.58 -21.78
xdef 193 linear   -9.61  0.22
ydef 201  linear   34.70  0.22
zdef 1 levels 1008.43
tdef  1 linear  00Z15AUG2002 1mo
vars 1
mrso=>mrso      0 t,y,x soil moisture

ga-> q config
Config: v2.0.a2 little-endian readline printim grib2 netcdf hdf4-sds
Grid Analysis and Display System (GrADS) Version 2.0.a2
Copyright (c) 1988-2008 by Brian Doty and the
Institute for Global Environment and Society (IGES)
This program is distributed WITHOUT ANY WARRANTY
See file COPYRIGHT for more information.

Built Wed May 21 16:34:42 MDT 2008 for i686-pc-linux-gnu

This version of GrADS has been configured with the following options:
  o Built on a LITTLE ENDIAN machine
  o Command line editing ENABLED
  o printim command for image output ENABLED
  o GRIB2 interface ENABLED
  o NetCDF interface ENABLED
  o HDF4 SDS interface ENABLED
  o Athena Widget GUI DISABLED
  o OPeNDAP gridded data interface DISABLED
  o OPeNDAP station data interface DISABLED

For additional information please consult


Dr. Sara A. Rauscher
Earth System Physics Section
The Abdus Salam International Centre for Theoretical Physics
Strada Costiera 11
34014 Trieste ITALY
ph: +39 040 2240 225 fax: +39 040 2240 449
email: srausche at

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