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Re: problem in using ferret
Hi Zhi,
1 - There are a number of "reserved names" in Ferret that have special
meanings, like X and Y. You can still use them if they're in a netCDF
file, by putting them in single-quotes
yes? shade 'x'
You can find the discussion of this in the Users Guide, by looking in
the index under "netCDF, variables, invalid names, or variable, names in
netCDF file".
2 - This turns out to be a due to a bug, which we found and fixed in the
most recent version of Ferret, v5.80. SHADE and POLYGON plots did not
get the levels correctly set when there is just one level, although the
colorbar is correct. The value of dy in your dataset is 111194.93 and
an internal loss of precision meant the level was not set correctly.
If you can upgrade to Ferret v5.80 this will be fixed. (try "shade dy -
111194.93").
Ansley
Zhi Liang wrote:
Hi,
I generated a netcdf grid file and I found two problems when I use
ferret shade command.
1. I use variable name "x" and "y" to represent the grid location
along i and j-direction.
When I try to do shade x ( or y) in ferret, I got the following
error message ( I tried on different system),
**ERROR: dimensions improperly specified: 9999999 words were requested.
*** NOTE: Check for unspecified limits on an ABSTRACT axis
*** NOTE: Use the SHOW GRID command to see the axes
After rename "x" to "x_T" or something else, it works fine. This
looks like the ferret can
not deal with variable with name "x" or "y" ("x" and "y" are
reserved in ferret?). We want
to use the general variable "x" and "y" and do not want to rename
these variables.
2. There is another variable dy in the grid file. dy is constant for
all the points. When I do shade dy,
it has no error message, but the drawing window is empty ( no
constant graph) .
I attached a simple grid file in the email for testing purpose and the
ferret version I am
using is FERRET v5.70. Could anyone provide some solutions or
suggestions?
Thank you very much!
Zhi
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