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NOTICE: This version of the NSF Unidata web site (archive.unidata.ucar.edu) is no longer being updated.
Current content can be found at unidata.ucar.edu.
To learn about what's going on, see About the Archive Site.
Folks, I am having 2 separate problems with netCDF files in IDL. This is with "classic" netCDF files, using netCDF 3.6.2 in IDL 7.0 and 7.1.1. 1) On Linux when I write a large (but legal) netCDF file (typically between 500MB and 3.9GB) it sometimes returns an error, "ncdf_varput failed". The file is the correct size, and is almost OK, but there is typically a small amount of the data in the middle of the file that is not written correctly. Doing the identical operation again it will usually succeed; the failure appears to be random. This is a legal netCDF file because even when the array variable is greater than 2GB it is the only variable in the file. But I often get the error even when the variable is only 500MB. The ncdf_varput is being done as a single large write, writing the entire variable to the file at once. 2) On Windows 7 with 64-bit IDL when reading a netCDF file with a variable larger than 2GB does not work. There is no error returned, and the first 2GB of data in the returned array is fine, but the data past 2GB in the array is garbage. These files read fine on 64-bit IDL on Linux, the problem is confined to Windows. I was observing these failures on IDL 7.0. To see if they might perhaps be fixed in the latest version of IDL I installed IDL 7.1.1 on Linux and Windows today. Unfortunately both of these problems persist, they are not fixed. Has anyone seem similar problems, and have any idea how to fix them? I have reported them to ITT Vis. Thanks, Mark Rivers University of Chicago
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