GrADS Commands

### GrADS Commands Sorted by Attribute

Animation
`set loopdim` Sets dimension to animate
`set loopincr` Sets looping increment
`set looping` Turns on animation when fewer than three dimesions are varying
`set dbuff` Turns on/off double buffer mode
`swap` Swaps buffers when in double buffer mode

Axis Labeling
`draw xlab` Draws an X-axis label
`draw ylab` Draws a Y-axis label
`set vrange` Sets the range of values for Y-axis scaling
`set vrange2` Sets the range of values for X-axis scaling
`set xaxis` Specifies where the labeled tick marks will be placed on the X-axis
`set xflip` Flips the order of the horizontal axis
`set xlab` Controls the format of X-axis tick mark labels
`set xlabs` Gives specific text for X-axis labels
`set xlevs` Specifies each individual labeled tick mark for the X-axis
`set xlint` Specifies the interval between labeled tick marks on the X-axis
`set xlopts` Controls X-axis label options
`set xlpos` Controls position of X-axis labels
`set xyrev` Reverses the X and Y axes on a plot
`set yaxis` Specifies where the labeled tick marks will be placed on the Y-axis
`set yflip` Flips the order of the vertical axis
`set ylab` Controls the format of Y-axis tick mark labels
`set ylabs` Gives specific text for Y-axis labels
`set ylevs` Specifies each individual labeled tick mark for the Y-axis
`set ylint` Specifies the interval between labeled tick marks on the Y-axis
`set ylopts` Controls Y-axis label options
`set ylpos` Controls position of Y-axis labels
`set zlog` Sets log scaling of the Z dimension

Bar Graphs
`set barbase` Sets the reference point for bar graphs
`set bargap` Sets the gap between bars for bar graphs
`set baropts` Sets characteristics of bars for bar graphs
`set gxout bar` Graphics output type for bar graphs
`set gxout errbar` Graphics output type to show error bars

Color Control
`set fgvals` Assigns a color to a particular value; used with `set gxout fgrid`
`set lfcols`
`set rbcols` Specifies a new rainbow color sequence
`set rbrange` Assigns a range of values to rainbow colors
`set rgb` Defines a new color
`set wxcols` Controls color of weather symbols

Contour Settings
`set annot` Sets the color and thickness for the axis border, axis labels, and tickmarks.
`set black` Specifies a range of values for which no contours will be drawn
`set ccolor` Specifies the color of the plotted contours
`set ccols` Assigns specific colors for each contour level
`set cint` Sets the contour interval
`set clab` Controls contour labels
`set clevs` Sets specific contour levels
`set clopts` Contour label options
`set clskip` Sets the number of contour lines to skip when labelling
`set cmax` Contours not drawn above this value
`set cmin` Contours not drawn below this value
`set csmooth` Interpolates the grid to a finer resolution before contouring
`set cstyle` Sets the contour line style
`set cterp` Turns on/off spline smoothing
`set cthick` Sets contour line thickness

Display Controls
`clear` Clears the display window and resets many graphics options
`display` Draws a plot
`reset` Returns GrADS settings to default state with some exceptions
`set background` Sets background color
`set clip` Sets the coordinates for clipping the plot area
`set cmark` Sets the type of line marker
`set display` Sets the mode of display
`set frame` Draws a frame around plot borders
`set gridln` Controls appearance of grid lines; used with `set gxout grid`
`set gxout` Sets a graphics output type
`set line` Sets line attributes
`set missconn` Connects plots lines over missing data
`set parea` Specifies the area for plotting contour plots, maps, or line graphs
`set vpage` Sets dimensions of the virtual page
`set xsize` Resizes the graphics display window

Data and Image Output
`disable fwrite` Closes output file containing gridded data
`disable print` Closes output file containing images in metacode format
`enable print` Opens output file containing images in metacode format
`gxeps` Converts GrADS metacode format image files into postscript
`gxps` Converts GrADS metacode format image files into postscript
`gxtran` Displays GrADS metacode format image files
`outxwd` Copies the contents of the display window into a file in XWD format
`print` Copies the contents of display window to a file in a metacode format
`printim` Copies the contents of display window to a file in PNG or GIF format
`set fwrite` Sets filename, byte ordering, and format for data output
`set gxout fwrite` Graphics output type for writing data to file
`wi` Dumps the contents of the display window into a file in a variety of formats

Dimension Environment
`set x` Specifies the X-dimension in grid coordinates
`set y` Specifies the Y-dimension in grid coordinates
`set z` Specifies the Z-dimension in grid coordinates
`set t` Specifies the T-dimension in grid coordinates
`set e` Specifies the E-dimension in grid coordinates
`set lon` Specifies the X-dimension in world coordinates
`set lat` Specifies the Y-dimension in world coordinates
`set lev` Specifies the Z-dimension in world coordinates
`set time` Specifies the T-dimension in world coordinates
`set ens` Specifies the E-dimension in world coordinates

File I/O
`close` Closes a GrADS data file
`open` Opens a GrADS data file
`reinit` Returns GrADS to its initial state
`exec` Executes the list of GrADS commands contained in a file
`run` Runs a GrADS script
`sdfopen` Opens a NetCDF of HDF-SDS file that conforms to the COARDS conventions
`xdfopen` Opens a NetCDF of HDF-SDS file that does not conform to the COARDS conventions
`set dfile` Changes default file
`set imprun` Sets up automatic script execution before every display command

GrADS-User Interface
`grads` Starts the GrADS program
`help` Lists a few basic GrADS commands
`query` Returns information about a variety of aspects of the current GrADS session
`quit` Quits GrADS
`set datawarn` Prints "Entire Grid Undefined" in display window if all data are missing
`set stat` Turns on/off printing of statistical information for each display
`set warn` Turns on/off messages about the progress of certain mathematical operations
`!shell` Sends a command to the shell

Graphical Elements
`draw line` Draws a line
`draw mark` Draws a mark
`draw polyf` Draws a filled polygon
`draw rec` Draws a rectangle
`draw recf` Draws a filled rectangle
`draw wxsym` Draws a weather symbol

GRIB Utilities
`gribmap` Creates a map of data sets in GRIB format
`gribscan` Extracts grid info from data sets in GRIB format

Map Settings
`draw map` Draws a map outline
`set grid` Sets characteristics of displayed grid lines
`set map` Sets map background characteristics
`set mpdraw` Turns on/off drawing of map background
`set mpdset` Sets the resolution of the coastal outline
`set mproj` Sets current map projection
`set mpt` Controls map background characteristics
`set mpvals` Sets reference longitudes and latitudes for polar stereographic plots
`set poli` Turns on/off the drawing of political boundaries

Plot Annotation and Labeling
`draw string` Draws a string anywhere on the page
`draw title` Draws a title centered over a plot
`set dignum` Sets the number of significant digits after the decimal point
`set digsiz` Sets the size of plotted numbers
`set font` Selects the font for text display
`set grads` Turns on/off the GrADS logo in each plot
`set string` Sets string drawing attributes
`set strsiz` Sets the string character size
`set timelab` Turns on/off display of the time label
`set tlsupp` Suppresses the annotation of the year and/or month in date/time labels

Station Data
`collect` Saves station data in memory as a set
`set mdlopts`
`set wxopt` Controls weather symbol output; used with `set gxout wxsym`
`set stid` Turns on/off display of the station ID next to the data values
`set stnprint` Controls printing of station data values; used with `set gxout stat`
`stnmap` Writes out a hash table and/or link list information for station data

Variables
`define` Creates a new GrADS variable that is loaded into memory
`modify` Defines a climatological variable
`set defval` Interactively modifies grid point values for 2-D defined variables
`undefine` Frees the memory used by a defined variable

Vectors
`set arrlab` Toggles drawing the vector arrow label
`set arrowhead` Sets the size of the vector arrowhead
`set arrscl` Specifies arrow length scaling
`set gxout vector` Graphics output type for vector plots
`set hempref` Controls wind barb drawing conventions
`set strmden` Sets density of streamlines; used with `set gxout stream`

Widgets
`draw button` Draws a button widget
`redraw button` Resets a button widget on/off
`draw dropmenu` Draws a dropmenu widget
`set button` Specifies the color characteristics of a button widget
`set dialog` Sets color properties of dialog box widgets
`set dropmenu` Sets color properties of dropmenu widgets
`set rband` Sets characteristics for the 'rubber band' widget