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How to Use Grads Scripts
Return to the GrADS Overview
Note: Commands that you enter are in red
type; messages from GrADS are in green
type.
To launch GrADS, type grads at
the command line. You will be prompted by the question Landscape
Mode? To have a graphics window with landscape orientation,
simply hit the return key, or type n to
have a portrait-oriented window. Some of our scripts (especially those
with multiple plots on a page) have dimensions specific to landscape
or portrait mode. If you choose landscape, and the script has portrait
coordinates, you will get an error message like this (and the script
will stop running):
SET Error: vpage values beyond real
page limits
EXEC error: error in my_script.gs.
EXEC stopped.
To run a GrADS script: Type exec
scriptname at the GrADS prompt.
Example: exec sfcwind.gs.
To run GrADS scripts with the GrADS scripting
language (scripts with do loops and other programming in them, such
as animation.gs), type run
scriptname at the GrADS prompt. Most of
the scripts on the GrADS scripts pages use the exec
command. Only animation.gs
and cbar.gs require the run
command.
To advance to the next page/plot: A
c in a GrADS script clears the screen and
advances the script to the next plot page. As you are running the scripts,
you may have to hit the return key to advance the script to the next
plot.
Data indexing in GrADS: All indexing starts
with 1 (1 ... n ) -- unlike NCL, which indexes data sets from 0 (0 ...
n-1). For example, set t 1
sets the time index to the first time slice in the file.
