R: Plot Method for COBS Objects

plot.cobs {cobs} | R Documentation

## Plot Method for COBS Objects

### Description

The `plot` method for `cobs` objects. If there was `lambda` selection, it provides two plots by default.

### Usage

    ## S3 method for class 'cobs'
    plot(x, which = if(x$select.lambda) 1:2 else 2,
         show.k = TRUE,
         col = par("col"), l.col = c("red","pink"), k.col = gray(c(0.6, 0.8)),
         lwd = 2, cex = 0.4, ylim = NULL,
         xlab = deparse(x$call[[2]]),
         ylab = deparse(x$call[[3]]),
         main = paste(deparse(x$call, width.cutoff = 100), collapse="\n"),
         subtit= c("choosing lambda", "data & spline curve") , ...)

### Arguments

`x` | object of class `cobs`.
`which` | integer vector specifying which plots should be drawn;

`show.k` | logical indicating if the “effective dimensionality” k should also be shown. Only applicable when `which` contains 1.
`col, l.col, k.col` | colors for plotting; `k.col` only applies when `show.k` is true in the first plot (`which == 1`) where `l.col[2]` and `k.col[2]` are only used as well, for denoting “doubtful” points; `col` is only used for the 2nd plot (`which == 2`).
`lwd, cex` | line width and point size for the 2nd plot (i.e. `which == 2`).
`ylim` | y-axis limits, see `axis`, with a smart default.
`xlab, ylab, main` | axis annotation; see also `axis`.
`subtit` | a vector of length 2, specifying a sub title for each plot (according to `which`).
`...` | further arguments passed and to internal `plot` methods.

### Details

`plot(.)` produces two side-by-side plots in case there was a search for the optimal lambda(`which = 1:2`), and only the (second) data plus spline curve plot otherwise (`which = 2`).

### Author(s)

Martin Maechler

### See Also

There are several other methods for COBS objects, see, e.g. `summary.cobs` or `predict.cobs`.

`cobs` for examples.

### Examples

    example(cobs)

    plot(Sbs)
    plot(fitted(Sbs), resid(Sbs),
         main = "Tukey-Anscombe plot for cobs()",
         sub = deparse(Sbs$call))

[Package cobs version 1.3-3 Index]