R: Oce Variant of contour

oce.contour {oce} | R Documentation

## Oce Variant of contour

### Description

This provides something analogous to `contour`, but with the ability to flip x and y. Setting `revy=TRUE` can be helpful if the `y` data represent pressure or depth below the surface.

### Usage

    oce.contour(x, y, z, revx = FALSE, revy = FALSE, add = FALSE,
      tformat, drawTimeRange = getOption("oceDrawTimeRange"),
      debug = getOption("oceDebug"), ...)

### Arguments

`x` | values for x grid.
`y` | values for y grid.
`z` | matrix for values to be contoured. The first dimension of `z` must equal the number of items in `x`, etc.
`revx` | set to `TRUE` to reverse the order in which the labels on the x axis are drawn
`revy` | set to `TRUE` to reverse the order in which the labels on the y axis are drawn
`add` | logical value indicating whether the contours should be added to a pre-existing plot.
`tformat` | time format; if not supplied, a reasonable choice will be made by `oce.axis.POSIXct`, which draws time axes.
`drawTimeRange` | logical, only used if the `x` axis is a time. If `TRUE`, then an indication of the time range of the data (not the axis) is indicated at the top-left margin of the graph. This is useful because the labels on time axes only indicate hours if the range is less than a day, etc.
`debug` | a flag that turns on debugging; set to 1 to information about the processing.
`...` | optional arguments passed to plotting functions.

### Author(s)

Dan Kelley

### Examples

    library(oce)
    data(topoWorld)
    ## coastline now, and in last glacial maximum
    lon <- topoWorld[["longitude"]]
    lat <- topoWorld[["latitude"]]
    z <- topoWorld[["z"]]
    oce.contour(lon, lat, z, levels=0, drawlabels=FALSE)
    oce.contour(lon, lat, z, levels=-130, drawlabels=FALSE, col='blue', add=TRUE)

[Package oce version 1.1-1 Index]