F_FORMAT

       Choose a nice floating format for displaying an array of REAL data.

       Called by TVLIST, IMLIST.

       fmt = F_FORMAT( minval, maxval, factor, [ length ] )

       MINVAL - REAL scalar giving the minimum value of an array of numbers
               for which one desires a nice format.
       MAXVAL - REAL scalar giving maximum value in array of numbers

       LENGTH - length of the output F format (default = 5)
               must be an integer scalar > 2

       FMT - an F or I format string, e.g. 'F5.1'
       FACTOR - factor of 10 by which to multiply array of numbers to achieve
               a pretty display using format FMT.

       Find a nice format to print an array of numbers with a minimum of 5.2e-3
       and a maximum  of 4.2e-2.
               IDL> fmt = F_FORMAT( 5.2e-3, 4.2e-2, factor )
       yields fmt = '(F5.2)' and factor = .01, i.e. the array can be displayed
       with a F5.2 format after multiplication by 100.

       Written W. Landsman              December 1988
       Deal with factors < 1.           August 1991
       Deal with factors < 1. *and* a large range    October 1992
       Now returns In format rather than Fn.0    February, 1994
       Converted to IDL V5.0   W. Landsman   September 1997

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