free grads

The Ensemble Dimension

Ensemble Handling in grads

The EDEF entry in a descriptor file 

How to organize the data

Example #1: Lag Ensembles

Example #2: Retrospective Daily Hindcasts from CFS

Example #3: Ensembles with Different Lengths and Start Times in Binary Format

set lat|lon|lev|time|ens

set lat|lon|lev|time|ens val1 <val2>

This set command sets one dimension of the dimension environment using world coordinates.

q ens

q ens

This command returns information about the ensemble dimension. For each ensemble member, the printout includes the index number, ensemble name, length (number of time steps), start time in date format, time axis index of start time, and grib2 codes, if present.

enable print

This command is obsolete beginning with grads version 2.1. It has been replaced by gxprint.

This command opens the output file fname that will contain the instructions in grads metacode format to create a hardcopy of the graphical display. Any existing contents of fname will be lost. The output file fname is referred to as a grads metafile.

eloop

eloop(expr)

The eloop function is similar to the tloop function. When displaying a grads expression (expr) with the E (Ensemble) dimension varying, the eloop function will evaluate the exprwith each designated ensemble member fixed, then reassemble the grids to obtain a final result that is E-varying. The eloop function is provided as a way to obtain E-varying results from functions or expressions that are unable to operate when E is a varying dimension.

set cthick

This command sets the thickness for the contour lines.

Synatx

set cthick thickness

The thickness arg must be an integer in the range of 1 to 12 (or 256 for version 2.1 and later)

query

The query command allows the user to get information about a variety of aspects of the current grads session. Configuration, plot characteristics, graphics specifics, and file structure are some examples. The use of query pos combined with the coordinate transformations is the basis of many interactive applications with buttons and drop menus. The query command may be shortened to simply q. The syntax is:

query <option>
or
q <option>

set cterp

set cterp on|off

Turns spline smoothing on or off. "Sticks" until reset. Shaded contours are drawn without spline fitting, so to insure an exact match when overlaying contour lines and shaded contours of the same field, specify cterp as off. You can still use the csmooth option, which affects both contour lines and shaded contours.