[gradsusr] TTINDEX UDF in OpenGrADS 2.0.a7

[Stephen McMillan]

I was getting some very erroneous (highly negative) total totals index
values when using the "ttindex" udf available with the OpenGrADS package,
based on the prescribed usage format that appears when I type "d ttindex" on
the command line:
Purpose: Calculate Total Totals Index
Usage:    display ttindex(t500,t850,rh850)
              t500 = temperature at 500 hPa [K]
              t850 = temperature at 850 hPa [K]
              rh850 = relative humidity at 850 hPa [%]

However, the UDF function line itself in the script file suggests the
following usage:  display ttindex(t850,rh850,t500)

The latter appears to produce reasonable display values, e.g., 10 to 60.  It
seems the usage format text needs to be changed within the downloadable UDF
script (I have done so in my copy).

I was using v2.0.a7.oga.3 on a Windows XP.

Stephen McMillan

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