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      Interactively plot a function on current plot.


Calling Sequence

      eqv2, file


      file = equation file. in

Keyword Parameters


        COLOR=clr Curve burn in color (def=!p.color).


Common Blocks


      Note: The QUIT button allows burning in the final curve and lists its
        values. The LIST button lists the current curve parameters.
      Equation file format: This file defines the equation, the x range
      and range of each adjustable parameter. The file is a text file with
      certain tags. Null and comment lines (* in first column) are allowed.
      The tags are shown by an example:
          eq: y = a + b*x + c*x^2
          title: Parabola
          xrange: -10 10
          n_points: 100
          par: a -50 50 0
          par: b -50 50 0
          par: c -10 10 1
      The parameter tags are followed by 4 items: Parameter name (as in the
      equation), min value, max value, initial value. An optional 5th item
      may be the word int to force an integer value (for flags or harmonics).

Modification History

      R. Sterner, 1998 Feb 24
R. Sterner, 1998 Mar 30 --- Added font_size = fntsz.
      R. Sterner, 2010 May 04 --- Converted arrays from () to []. Just a bit.
  ????? What is this routine ?????
  Copyright (C) 1998, Johns Hopkins University/Applied Physics Laboratory
  This software may be used, copied, or redistributed as long as it is not
  sold and this copyright notice is reproduced on each copy made. This
  routine is provided as is without any express or implied warranties
  whatsoever. Other limitations apply as described in the file disclaimer.txt.

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