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q xy2gr & q xy2w

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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:  

درباره X ,

set xlint

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set xlint

set xlint interval

Specifies the interval between labeled tick marks on the X-axis.   

درباره X ,

set xlevs

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set xlevs

set xlevs lev1 lev2 ... levN

Allows the user to specify each individual labeled tick mark for the X-axis.  

درباره X ,

set xlab

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set xlab

set xlab option

Controls the format of X-axis tick mark labels. The option argument may be one of the following:  

درباره X ,

set xflip

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set xflip

set xflip on|off

Flips the order of the horizontal axis (whatever axis is horizontal after xyrev is applied). Reset by a clear or set vpage command.

درباره X ,

xdfopen

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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:  

درباره X ,

set x|y|z|t|e

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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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