prefield - prepare input file for 'muplot' to plot 2-d fields by arrows

       Copyright © 1997, 2001, 2005, 2007, 2009, 2011-2012 Dimitar Ivanov

       License: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
       This is free software: you are free to change and redistribute it.  There is NO WARRANTY, to  the  extent
       permitted by law.

prefield 1.4.8                                      July 2014                                        PREFIELD(1)

       prefield will prepare input file for 'muplot' to plot 2-d fields by arrows

       Example:

       On  running "prefield test.dat 20 1 2 5 6" the source file 'test.dat' will be read, and a field-data file
       will be produced with the 1st and 2nd columns being the x and y space-positions like in the source  file,
       whereas  the  fields  F_x and F_y are calculated from the values in the 5th and 6th columns of the source
       data multiplied by the second command line option, which means in this example a 20-fold magnification.

       Use '-' as file name to read from <stdin> and write to <stdout>.

       prefield -  prepare input file for 'muplot' to plot 2-d fields by arrows

prefield<file><scale>xyF_xF_y