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Rotate the axis on the map

set xyrev

set xyrev on|off

Reverses the axes on a plot.

Usage Notes

Examples

By default for a Z, T plot, the time dimension is plotted horizontally, and the Z dimension is plotted vertically. By setting xyrev, the time dimension would be plotted vertically and the Z dimension would be plotted horizontally. Reset by a clear or set vpage command.

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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:  

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xdfopen

xdfopen filename

grads requires a certain amount of metadata in order to understand how to read a NetCDF/HDF-SDS data file, also called a self-describing file (SDF). The sdfopen command assumes all the metadata is internal to the self-describing file, whereas the xdfopen command allows the user to supplement or replace any internal metadata via a data descriptor file. In this way, xdfopen provides access to some self-describing files that do not comply with the COARDS conventions.

filename is the name of the data descriptor file that contains the supplemental metadata. It has a syntax very similar to the regular data descriptor files that are used with the open command. The few differences are noted below:  

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set x|y|z|t|e

set x|y|z|t|e val1 <val2>

This sets one dimension of the dimension environment using grid coordinates. You may use whatever coordinates are convenient to you. Issuing set lon is equivalent to issuing set x, both set the x dimension. The difference is only the units you wish to use when entering the command.

When you enter just one value, that dimension is said to be "fixed". When you enter two values, that dimension is said to be "varying". The combination of fixed and varying dimensions defines the dimension environment. 

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