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       d.linegraph   -  Generates  and displays simple line graphs in the active graphics monitor
       display frame.


       display, cartography


       d.linegraph --help
       d.linegraph       x_file=string       y_file=string[,string,...]        [directory=string]
       [y_color=string[,string,...]]   [title_color=string]   [x_title=string]   [y_title=string]
       [title=string]   [--help]  [--verbose]  [--quiet]  [--ui]

           Print usage summary

           Verbose module output

           Quiet module output

           Force launching GUI dialog

       x_file=string [required]
           Name of data file for X axis of graph

       y_file=string[,string,...] [required]
           Name of data file(s) for Y axis of graph

           Path to file location

           Color for Y data

           Color for axis, tics, numbers, and title
           Default: black

           Title for X data

           Title for Y data

           Title for Graph


       d.linegraph is a primitive program to draw simple x,y line graphs based on numerical  data
       contained in separate files.

       Data file format
       The  X  and  Y  data files for the graph are essentially a column of numbers in each file,
       with one input number per line.  The program  expects  that  each  X  value  will  have  a
       corresponding Y value, therefore the number of lines in each data input file should be the
       same.  Essentially, the X data becomes the X axis reference to which the Y data is plotted
       as  a  line.  Therefore,  the  X  data should be a monotonically increasing progression of
       numbers (i.e.  "1,2,3,..."; "0, 10, 100, 1000,..."; "...-5,-1,0,1,5...").  If  multiple  Y
       data  files  are  used, the Y axis scale will be based on the range of minimum and maximum
       values from all Y files, then all Y data given will be graphed according to that Y  scale.
       Therefore,  if  multiple  Y data inputs are used with dissimilar units, the graph produced
       comparing the two will be deceptive.

           Path to the directory where the input files are located.
           Example format: /usr/grass/data/graph

           Color to be used for drawing the lines in the graph. If  multiple  Y  data  files  are
           used, an equal number of colors may be used to control the colors of the lines. Colors
           will be assigned to Y data in respect to the sequence of instantiation on the  command
           line.  Options are listed below.  By default, a series of colors will be chosen by the
           program if none are provided upon invocation.
           Order of default colors: yellow,  red,  green,  violet,  blue,  orange,  gray,  brown,
           magenta, white, indigo).

           The color to be used for titles, axis lines, tics, and scale numbers.
           Default: "white"
           Color options: red, orange, yellow, green, blue, indigo, violet, magenta, brown, gray,
           white, and black.

           Title to describe X data. Will be centered beneath the  graph.  Default  is  no  title
           unless  the  need  for  a unit descriptor is computed by the program (i.e. X: title in
           hundreds).  Also, see NOTES section (below) for a format caveat for multi-word titles.

           Title to describe Y data. Will be centered beneath the X data title.   Default  is  no
           title  unless  the  need  for  a  unit  descriptor is computed by the program (i.e. Y:
           ttiittllee in thousands). Also, see NOTES section (below)  for  a  format  caveat  for
           multi-word titles. In the case of graphs with multiple lines, one may wish to use more
           specific title placement by using the d.text or v.label programs.

           Title to describe the graph. Will be centered over the top of graph.   Default  is  no
           title. See NOTES section (below) for a format caveat for multi-word titles.


       Since  the  command line parser is not amiable to multiple word inputs, to input titles of
       more than one word, use the underscore character ("") to represent spaces (" ").

       Example: "titleCensusdata1990" would be printed over the graph as "Census data 1990".

       The way the program locates and labels  tic  marks  is  less  than  perfect:  1)  although
       distances  between Y tics is proportional to the value, they are not proportional on the X
       axis; 2) decimal values between -1 and 1 can be printed on the X axis, but not on Y. (With
       respect  to  the  later,  the  input  for Y values can all be multiplied by a factor of 10
       before graphing).

       It might be easier to use  a  3rd  party  tool  such  as  xgraph  or  GNUplot  instead  of
       d.linegraph.  .  (You can make GNUplot output pretty by using its SVG or PostScript output
       driver and converting that back into a rasterized image in a paint program)


        d.frame, d.text, v.label


       Chris Rewerts, Agricultural Engineering, Purdue University

       Last changed: $Date: 2012-12-28 11:52:38 +0100 (Fri, 28 Dec 2012) $

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