# Plots the residual track computed at regular interval during the fit of the NMF model `x`.

## Description

Plots the residual track computed at regular interval during the fit of the NMF model `x`.

## Usage

```S4 (NMFfit,missing)
`plot`(x, y, skip = -1, ...)```

## Arguments

skip
an integer that indicates the number of points to skip/remove from the beginning of the curve. If `skip=1L` (default) only the initial residual -- that is computed before any iteration, is skipped, if present in the track (it associated with iteration 0).
x
the coordinates of points in the plot. Alternatively, a single plotting structure, function or any R object with a `plot` method can be provided.
y
the y coordinates of points in the plot, optional if `x` is an appropriate structure.
...
Arguments to be passed to methods, such as graphical parameters (see `par`). Many methods will accept the following arguments:
1. `type`what type of plot should be drawn. Possible types are
• `"p"` for points,
• `"l"` for lines,
• `"b"` for both,
• `"c"` for the lines part alone of `"b"`,
• `"o"` for both ‘overplotted’,
• `"h"` for ‘histogram’ like (or ‘high-density’) vertical lines,
• `"s"` for stair steps,
• `"S"` for other steps, see ‘Details’ below,
• `"n"` for no plotting.
All other `type`s give a warning or an error; using, e.g., `type = "punkte"` being equivalent to `type = "p"` for S compatibility. Note that some methods, e.g. `plot.factor`, do not accept this.
2. `main`an overall title for the plot: see `title`.
3. `sub`a sub title for the plot: see `title`.
4. `xlab`a title for the x axis: see `title`.
5. `ylab`a title for the y axis: see `title`.
6. `asp`the `y/x` aspect ratio, see `plot.window`.