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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   [-xysl]   x_file=string    y_file=string[,string,...]     [directory=string]
       [y_color=string[,string,...]]       [color_table=style]      [width=integer[,integer,...]]
       [title_color=string]        [x_title=string]        [y_title=string]        [title=string]
       [y_range=min,max]      [y_tics=float[,float,...]]      [x_scale=float]     [y_scale=float]
       [icon=string]                  [point_size=float]                   [secondary_color=name]
       [secondary_width=float[,float,...]]   [--help]  [--verbose]  [--quiet]  [--ui]

           Scale only X labels, not values

           Scale only Y labels, not values

           Draw points

           Do not draw lines

           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 files
           Path to the directory where the input files are located

           Color for Y data

           Name of color table
           Options:  aspect, aspectcolr, bcyr, bgyr, blues, byg, byr, celsius, corine, curvature,
           differences, elevation, etopo2, evi, fahrenheit, gdd, grass,  greens,  grey,  grey.eq,
           grey.log,  grey1.0,  grey255, gyr, haxby, inferno, kelvin, magma, ndvi, ndwi, oranges,
           plasma,    population,    population_dens,     precipitation,     precipitation_daily,
           precipitation_monthly, rainbow, ramp, random, reds, roygbiv, rstcurv, ryb, ryg, sepia,
           slope, soilmoisture, srtm, srtm_plus, terrain, viridis, water, wave
            aspect: aspect oriented grey colors [range: map values]
            aspectcolr: aspect oriented rainbow colors [range: 0 to 360]
            bcyr: blue through cyan through yellow to red [range: map values]
            bgyr: blue through green through yellow to red [range: map values]
            blues: white to blue [range: map values]
            byg: blue through yellow to green [range: map values]
            byr: blue through yellow to red [range: map values]
            celsius: blue to red for degree Celsius temperature [range: -80 to 80]
            corine: EU Corine land cover colors [range: 111 to 995]
            curvature: for terrain curvatures (from and  r.slope.aspect)  [range:  map
            differences: differences oriented colors [range: map values]
            elevation:  maps relative ranges of raster values to elevation color ramp [range: map
            etopo2: colors for ETOPO2 worldwide bathymetry/topography [range: -11000 to 8850]
            evi: enhanced vegetative index colors [range: -1 to 1]
            fahrenheit: blue to red for Fahrenheit temperature [range: -112 to 176]
            gdd: accumulated growing degree days [range: 0 to 6000]
            grass: GRASS GIS green (perceptually uniform) [range: map values]
            greens: white to green [range: map values]
            grey: grey scale [range: map values]
            grey.eq: histogram-equalized grey scale [range: map values]
            grey.log: histogram logarithmic transformed grey scale [range: map values]
            grey1.0: grey scale for raster values between 0.0-1.0 [range: 0 to 1]
            grey255: grey scale for raster values between 0-255 [range: 0 to 255]
            gyr: green through yellow to red [range: map values]
            haxby: relative colors for bathymetry or topography [range: map values]
            inferno: perceptually uniform sequential color table inferno [range: map values]
            kelvin: blue to red for temperature in Kelvin scale [range: 193.15 to 353.15]
            magma: perceptually uniform sequential color table magma [range: map values]
            ndvi: Normalized Difference Vegetation Index colors [range: -1 to 1]
            ndwi: Normalized Difference Water Index colors [range: -200 to 200]
            oranges: white to orange [range: map values]
            plasma: perceptually uniform sequential color table plasma [range: map values]
            population: color table covering human population classification breaks [range: 0  to
            population_dens:  color table covering human population density classification breaks
           [range: 0 to 1e+09]
            precipitation: precipitation color table (0..2000mm) [range: 0 to 7000]
            precipitation_daily: precipitation color table (0..1000mm) [range: 0 to 10000]
            precipitation_monthly: precipitation color table (0..1000mm) [range: 0 to 1000]
            rainbow: rainbow color table [range: map values]
            ramp: color ramp [range: map values]
            random: random color table [range: map values]
            reds: white to red [range: map values]
            roygbiv:  [range: map values]
            rstcurv: terrain curvature (from r.resamp.rst) [range: map values]
            ryb: red through yellow to blue [range: map values]
            ryg: red through yellow to green [range: map values]
            sepia: yellowish-brown through to white [range: map values]
            slope: r.slope.aspect-type slope colors for raster values 0-90 [range: 0 to 90]
            soilmoisture: soilmoisture color table (0.0-1.0) [range: 0 to 1]
            srtm: color palette for Shuttle Radar Topography Mission elevation [range: -11000  to
            srtm_plus:  color  palette  for  Shuttle  Radar  Topography  Mission  elevation (with
           seafloor colors) [range: -11000 to 8850]
            terrain: global elevation color table covering -11000 to  +8850m  [range:  -11000  to
            viridis: perceptually uniform sequential color table viridis [range: map values]
            water: water depth [range: map values]
            wave: color wave [range: map values]

           Width of the lines

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

           Title for X data

           Title for Y data

           Title for Graph

           Minimum and maximun value for Y axis (min,max)

           Tic values for the Y axis

           Scale for X values

           Scale for Y values

           Symbol for point
           Options:    basic/arrow,    basic/arrow1,   basic/arrow2,   basic/arrow3,   basic/box,
           basic/circle, basic/cross1, basic/cross2, basic/cross3, basic/diamond,  basic/hexagon,
           basic/marker,  basic/octagon,  basic/pin,  basic/pin_dot,  basic/point, basic/pushpin,
           basic/star,  basic/triangle,  basic/x,  demo/muchomurka,  demo/smrk,   extra/4pt_star,
           extra/adcp,    extra/airport,    extra/alpha_flag,    extra/bridge,   extra/dim_arrow,
           extra/dive_flag,  extra/fiducial,   extra/fish,   extra/half-box,   extra/half-circle,
           extra/offbox_ne,  extra/offbox_nw,  extra/offbox_se,  extra/offbox_sw, extra/pentagon,
           extra/ping,   extra/ring,   extra/simple_zia,   extra/target,    geology/circle_cross,
           geology/half-arrow_left,         geology/half-arrow_right,         geology/strike_box,
           geology/strike_circle,      geology/strike_cleavage,       geology/strike_half-bowtie,
           geology/strike_line,  geology/strike_parallel,  geology/strike_triangle,  legend/area,
           legend/area_curved,    legend/line,    legend/line_crooked,    n_arrows/basic_compass,
           n_arrows/fancy_compass,   n_arrows/n_arrow1a,  n_arrows/n_arrow1b,  n_arrows/n_arrow2,
           n_arrows/n_arrow3,    n_arrows/n_arrow4,     n_arrows/n_arrow5,     n_arrows/n_arrow6,
           n_arrows/n_arrow7a,    n_arrows/n_arrow7b,   n_arrows/n_arrow8a,   n_arrows/n_arrow8b,
           Default: basic/circle

           Point size
           Default: 5

           Color for point symbol edge color
           Default: black

           Width of point symbol lines
           Default: 0.1


       d.linegraph is a module to draw simple x,y line graphs (plots)  based  on  numerical  data
       contained in separate files.

   Data 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.

   File inputs
       If the directory option is provided, the paths to files can (and should) be only  relative
       paths  to these files. While this is not recommended for scripting, it can be advantageous
       when typing the paths manually. For example when all files are  stored  in  the  directory
       /home/john/data, the user can provide the following in the command line:
       d.linegraph directory=/home/john/data x_file=x.txt y_file=y1.txt,y2.txt

   Managing colors
       The user can specify the y_color option, the color_table option or just leave the defaults
       to influence the color of the plotted lines.

       Colors specified by y_color option are 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.  It can be one of GRASS GIS named colors or the RGB
       values from 0-255 separated by colons (RRR:GGG:BBB).

       Alternatively, the user can use the color_table option to specify one  of  the  GRASS  GIS
       predefined color tables.

       By  default,  a  series  of  colors will be chosen by the module if none are provided upon
       invocation. The order of default colors is red, green, violet, blue, orange, gray,  brown,
       magenta, white, and indigo. The user is advised not to rely on the order of default colors
       but to either use the  y_color  or  the  color_table  option  to  obtain  predictable  and
       reproducible results.

       The  color to be used for titles, axis lines, tics, and scale numbers is determined by the
       title_color option. The user can provide one of the GRASS GIS named colors (such as  gray,
       white, or black) or use the GRASS GIS colon-separated format for RGB (RRR:GGG:BBB).

   Titles, labels, and tics
       The  title option specifies the text for the title of the graph.  It will be centered over
       the top of graph.  The x_title option is a text to describe data for X axis.  It  will  be
       centered  beneath  the  graph.  Default  is  no  text  unless  there  is a need for a unit
       descriptor determined by the d.linegraph module, then string  such  as  "in  hundreds"  is
       generated.   The y_title option is a text to describe data for Y axis. It will be centered
       beneath the X data description. Similarly, to the  x_title  option,  default  is  no  text
       unless  there  is  a  need  for  an auto-generated description. In the case of graphs with
       multiple lines (multiple inputs for Y axis), user may  wish  to  use  more  specific  text
       placement using the d.text or v.label programs.


       For  historical reasons, the d.linegraph module accepts titles of more than one word where
       the  underscore  character  ("_")  is  used  to  represent  spaces  ("  ").  For   example
       "Census_data_1990"  would  be  printed  over  the  graph as "Census data 1990". The use of
       underscores is not necessary to use as long as the parameter  is  quoted  in  the  command
       line.  In general, use of underscores is not recommended and there is no need to use it at
       all in the GUI or when using d.linegraph in Python scripts.

       The way the program locates and labels tic marks is less than perfect:
       1) although distances between  Y  tics  are  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).

       Depending  on  the user’s needs, it might be easier or more appropriate to use a 3rd party
       tool such as xgraph, gnuplot, Matplotlib in Python, or R instead of  d.linegraph.   For  a
       more  general  solution  for plotting in GRASS GIS, the user is advised to use the d.graph


       The following can be executed in Bash to create the input data for this example. The  user
       can just create these files in a text editor, save them and specify path to them.
       cat > x.txt <<EOF
       cat > y1.txt <<EOF
       cat > y2.txt <<EOF

       The  next  command  sequence creates a file plot.png in the current directory which is the
       drawing made by d.linegraph.
       d.mon start=cairo output=plot.png width=400 height=400
       d.linegraph x_file=x.txt y_file=y1.txt,y2.txt
       d.mon stop=cairo


        d.frame, d.text, v.label, d.graph, d.histogram


       Chris Rewerts, Agricultural Engineering, Purdue University

       Last changed: $Date: 2017-02-02 10:10:41 +0100 (Thu, 02 Feb 2017) $


       Available at: d.linegraph source code (history)

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