GridData (
data,
xvals=None,
yvals=None,
inline=_unset,
**keyw,
)
Return a _FileItem representing a function of two variables.
GridData represents a function that has been tabulated on a
rectangular grid. The data are written to a file; no copy is kept
in memory.
Arguments:

data
 the data to plot: a 2d array with dimensions
(numx,numy).

xvals
 a 1d array with dimension
numx

yvals
 a 1d array with dimension
numy

binary=<bool>
 send data to gnuplot in binary format?

inline=<bool>
 send data to gnuplot "inline"?
Note the unusual argument order! The data are specified before
the x and y values. (This inconsistency was probably a mistake;
after all, the default xvals and yvals are not very useful.)
data must be a data array holding the values of a function
f(x,y) tabulated on a grid of points, such that 'data[i,j] ==
f(xvals[i], yvals[j])'. If xvals and/or yvals are omitted,
integers (starting with 0) are used for that coordinate. The data
are written to a temporary file; no copy of the data is kept in
memory.
If binary=0 then the data are written to a datafile as x y
f(x,y) triplets (y changes most rapidly) that can be used by
gnuplot's splot command. Blank lines are included each time the
value of x changes so that gnuplot knows to plot a surface through
the data.
If binary=1 then the data are written to a file in a binary
format that splot can understand. Binary format is faster and
usually saves disk space but is not humanreadable. If your
version of gnuplot doesn't support binary format (it is a
recentlyadded feature), this behavior can be disabled by setting
the configuration variable
gp.GnuplotOpts.recognizes_binary_splot=0 in the appropriate
gp*.py file.
Thus if you have three arrays in the above format and a Gnuplot
instance called g, you can plot your data by typing
g.splot(Gnuplot.GridData(data,xvals,yvals)) .
Exceptions


Errors.DataError( 'The size of xvals must be the same as the size of ' 'the first dimension of the data array' )
Errors.DataError( 'The size of yvals must be the same as the size of ' 'the second dimension of the data array' )
Errors.DataError( 'data array must be twodimensional' )
Errors.OptionError( 'binary inline data not supported' )

