Nplot is a powerful ploting package for graphing multiple
line plots.  It reads in test file data and produces a
PostScript file.  A couple of things to keep in mind:  you
can re-use and edit (using vi or emacs or whatever) the format
file (e.g. *.fmt) to make changes w/o using the menu.  Or you
can use the menu.  To run nplot, type
$ nplot

It will then prompt you for the format file name.  Either type in
a new name or an existing name.  If an existing name is entered, nplot
will ask you if you want to use the existing file.  At that point,
nplot will ask for the filename of the "x" data.  It will ask for
the column in that file and the number of points, it will then ask for
the same info for y-data.  It will ask whether line or marks are 
required and how many lines to skip per data point used.  Other options
allow you to set the title, range of x-values, etc.  Type m<ret> to see
all the menu items.  See the example below...

Also, to get a subscript use ~sub() and for superscripts ~sup().
Greek characters are obtained in a similar manner, ~greek(W) == cap. omega

Here are some greek characters I know:
~greek(w) = omega
~greek(f) = phi
~greek(q) = theta
~greek(h) = eta

Cap. greek letters are obtained using cap. letters.


Here is an example for mag.fmt:

<106 [kempel@plato]:~/web/ECE435/Downloads >nplot
 Enter name of plot format file (no suffix):
mag
 Enter # of functions to be plotted ( <  11):
1
 Files assumed to have data in spaced columns
 Data only -- no text
 For repeated data file names - enter <return>
 Enter name of data file (with suffix) for x( 1)
low11.mp
 Enter column number of x data
1
 Enter number of points to plot
38
 Enter name of data file (with suffix) for y( 1)

 Enter column number of y data
2
 Type of plot file; Line [L] (default) or Mark [M] ?

 Enter skip factor (<return> = 0) 

 Enter selection: 
m
  ***************     MENU    ****************
 
FORMAT:               mag   (FORMAT.fmt file)
NAME  :               mag   (postscript NAME.ps file)
Number of LINE functions : [FL]     1
Number of MARK functions : [FM]     0

FILE   DATA FILES FOR X COORDINATE:     COLUMN #     NUM. POINTS
[X1]     low11.mp                             1          38

FILE   DATA FILES FOR Y COORDINATE:     COLUMN #     TYPE     SKIP
[Y1]     low11.mp                             2      LINE       0


TITLE  = Title of Graph
XLABEL = Independent Variable
YLABEL = Dependent Variable
 
PREVIEW =   T         XMAX    =  0.000E+00  YMAX    =  0.000E+00
BOX     =   T         XMIN    =  0.000E+00  YMIN    =  0.000E+00
GRID    =   F         XINCR   =  0.000E+00  YINCR   =  0.000E+00
LAND    =   F         SMXINCR =  0.000E+00  SMYINCR =  0.000E+00
EXTRAT  =   T         XSIZE   =  4.50       YSIZE   =  3.50
SMTICS  =   T         XOFFSET =  2.00       YOFFSET =  6.00
CLIP    =   T         EXTRAX  =   F         EXTRAY  =   F
MARKSZ  =  0.80       XCOORD  =  0.00       YCOORD  =  0.00
LINESZ  =  0.50       XFMT    = (f5.1)      YFMT    = (f5.1)  
LGND    =   F         XLOG    =   F         YLOG    =   F
NLINES   =  1


VARIABLE NAME to change value,
 P to plot, 
 R to rescale X/Y MIN/MAX, 
 RR to re-read data files, 
 M to update menu : 

 Enter selection: 
title
 ENTER TITLE
Low Pass Filter S~sub(1)~sub(1) Magnitude vs. Frequency
 TITLE changed to ; 
 Low Pass Filter S~sub(1)~sub(1) Magnitude vs. Frequency
 Enter selection: 
xlabel
 ENTER XLABEL
Frequency [MHz]
 XLABEL changed to ; 
 Frequency [MHz]
 Enter selection: 
ylabel
 ENTER YLABEL
S~sub(1)~sub(1) Magnitude
 YLABEL changed to ; 
 S~sub(1)~sub(1) Magnitude
 Enter selection: 
xmin
 ENTER XMIN
0
 XMIN changed to ;   0.
 Enter selection: 
xmax
 ENTER XMAX
2000
 XMAX changed to ;     2000.00
 Enter selection: 
xincr
 ENTER XINCR
500
 XINCR changed to ;     500.000
 Enter selection: 
smxincr
 ENTER SMXINCR
100
 SMXINCR changed to ;    100.0000
 Enter selection: 
xfmt
 ENTER XFMT
(f6.1)
 XFMT changed to ; (f6.1)  
 Enter selection: 

ymax
 ENTER YMAX
2
 YMAX changed to ;     2.00000
 Enter selection: 
ymin
 ENTER YMIN
0
 YMIN changed to ;   0.
 Enter selection: 
yincr
 ENTER YINCR
0.5
 YINCR changed to ;    0.500000
 Enter selection: 
smyincr
 ENTER SMYINCR
0.1
 SMYINCR changed to ;     1.00000E-01
 Enter selection: 
p
 WARNING: File mag.ps already exists.
   Do you want to overwrite it? (<return> = yes)

 Enter selection: 
q
<107 [kempel@plato]:~/web/ECE435/Downloads >


More to come?  Ask Leo (kempel@egr.msu.edu)