banking {lattice} | R Documentation |

## Banking

### Description

Calculates banking slope

### Usage

banking(dx, dy)

### Arguments

`dx, dy` |
vector of consecutive x, y differences. |

### Details

`banking`

is a crude banking function used when
`aspect = "xy"`

in high level Trellis functions. It is usually not
very meaningful except with `xyplot`

. It just considers the
absolute slopes (based on `dx`

and `dy`

) and returns a value
which when adjusted by the panel scale limits will make the median of
the above absolute slopes correspond to a 45 degree line.

This function was inspired by the discussion of banking in the
documentation for Trellis Graphics available at Bell Labs' website
(see `Lattice`

), but is most likely identical to an
algorithm described previously by Cleveland et al (see below). It is
not clear (to the author) whether this is the algorithm used in
S-PLUS. Alternative banking rules, implemented as a similar function,
can be used as a drop-in replacement by suitably modifying
`lattice.options("banking")`

.

### Author(s)

Deepayan Sarkar Deepayan.Sarkar@R-project.org

### References

Cleveland, William S., McGill, Marylyn E. and McGill, Robert (1988),
"The Shape Parameter of a Two-variable Graph",
*Journal of the American Statistical Association*, 83, 289-300

### See Also

`Lattice`

, `xyplot`

[Package

*lattice* version 0.15-4

Index]