xvals.default: xvals.default function
Description
Default method for extracting 'x values' looks for $X, $x
in that order.Usage
## S3 method for class 'default':
xvals(obj, ...)
See Also
xvals, yvals, zvals,
yvals.default, zvals.default,
xvals.fromXYZ, yvals.fromXYZ,
zvals.fromXYZ, xvals.SpatialGridDataFrame,
yvals.SpatialGridDataFrame,
zvals.SpatialGridDataFrame