Ferret v5.51 release notes

# Ferret Version 5.51 Release Notes

March 3, 2003
This is primarily a bug fix release. Bug Fixes:
- Bug with SHADE/HLIMITS /VLIMITS fixed. The limits were applied to the axes, but the full range of data was used for the plot itself. (Bug was seen in sessions where only x-windows open, but not if a metafile was open, and not in batch mode.)
- Can now use filenames that begin with a digit. Previously, "set data 12v1.cdf; can data 12v1" saw an argument starting with a digit as a dataset number rather than a file name.
- Treat .nc extension consistently the way .cdf is used. Previously, for instance, the following failed to find and cancel dataset dat1:

          yes? use dat1.nc
          yes? cancel dat1

- Fix FILL plots in viewports defined with /AXES. Fill plots were incorrectly clipped in these viewports.
- Plot a color key for viewport plots, even if the key lies outside the viewport. This particularly applies to viewports that are defined with /AXES. Note that color keys are easily removed with SHADE/NOKEY or FILL/NOKEY.
- Fix location on page of the 1st viewport plotted. When a viewport is defined with the /AXES qualifier, the first time in a session that a viewport was plotted it was mis-positioned on the plot page.
- Can re-define a time axis to have a different calendar type. If a time axis is defined, its calendar can be changed by issuing a new DEFINE AXIS/CALENDAR= command.
- Bug reading seconds portion time origin from some NetCDF files. Both of these formats are valid: "10-JUN-1996 04:03:36", and "1996-06-10 04:03:36"
- Axes can be defined using more complex expressions. For example,

          yes? LET a = {1,2,3}
          yes? LET b = {2,3,4}

          yes? DEFINE AXIS/X xax = a/2 + b/2
          yes? LIST x[GX=XAX]