Plots random projections given multidimensional data and parameters of an MVN mixture model for the data.

```
randProj(data, seeds = NULL, parameters = NULL, z = NULL,
classification = NULL, truth = NULL, uncertainty = NULL,
what = c("classification", "error", "uncertainty"),
quantiles = c(0.75, 0.95),
addEllipses = TRUE, fillEllipses = mclust.options("fillEllipses"),
symbols = NULL, colors = NULL, scale = FALSE,
xlim = NULL, ylim = NULL, xlab = NULL, ylab = NULL,
cex = 1, PCH = ".", main = FALSE, ...)
```

A plot showing a random two-dimensional projection of the data, together with the location of the mixture components, classification, uncertainty, and/or classification errors.

The function also returns an invisible list with components `basis`

, the randomnly generated basis of the projection subspace, `data`

, a matrix of projected data, and `mu`

and `sigma`

the component parameters transformed to the projection subspace.

- data
A numeric matrix or data frame of observations. Categorical variables are not allowed. If a matrix or data frame, rows correspond to observations and columns correspond to variables.

- seeds
An integer value or a vector of integer values to be used as seed for random number generation. If multiple values are provided, then each seed should produce a different projection. By default, a single seed is drawn randomnly, so each call of

`randProj()`

produces different projections.- parameters
A named list giving the parameters of an

*MCLUST*model, used to produce superimposing ellipses on the plot. The relevant components are as follows:`mean`

The mean for each component. If there is more than one component, this is a matrix whose kth column is the mean of the

*k*th component of the mixture model.

`variance`

A list of variance parameters for the model. The components of this list depend on the model specification. See the help file for

`mclustVariance`

for details.

A matrix in which the `[i,k]`

th entry gives the
probability of observation *i* belonging to the *k*th class.
Used to compute `classification`

and
`uncertainty`

if those arguments aren't available.

A numeric or character vector representing a classification of
observations (rows) of `data`

. If present argument `z`

will be ignored.

A numeric or character vector giving a known
classification of each data point.
If `classification`

or `z`

is also present,
this is used for displaying classification errors.

A numeric vector of values in *(0,1)* giving the
uncertainty of each data point. If present argument `z`

will be ignored.

Choose from one of the following three options: `"classification"`

(default), `"error"`

, `"uncertainty"`

.

A vector of length 2 giving quantiles used in plotting
uncertainty. The smallest symbols correspond to the smallest
quantile (lowest uncertainty), medium-sized (open) symbols to points
falling between the given quantiles, and large (filled) symbols to
those in the largest quantile (highest uncertainty). The default is
*(0.75,0.95)*.

A logical indicating whether or not to add ellipses with axes
corresponding to the within-cluster covariances in case of
`"classification"`

or `"uncertainty"`

plots.

A logical specifying whether or not to fill ellipses with transparent
colors when `addEllipses = TRUE`

.

Either an integer or character vector assigning a plotting symbol to each
unique class in `classification`

. Elements in `colors`

correspond to classes in order of appearance in the sequence of
observations (the order used by the function `unique`

).
The default is given by `mclust.options("classPlotSymbols")`

.

Either an integer or character vector assigning a color to each
unique class in `classification`

. Elements in `colors`

correspond to classes in order of appearance in the sequence of
observations (the order used by the function `unique`

).
The default is given by `mclust.options("classPlotColors")`

.

A logical variable indicating whether or not the two chosen
dimensions should be plotted on the same scale, and
thus preserve the shape of the distribution.
Default: `scale=FALSE`

Optional arguments specifying bounds for the ordinate, abscissa of the plot. This may be useful for when comparing plots.

Optional arguments specifying the labels for, respectively, the horizontal and vertical axis.

A numerical value specifying the size of the plotting symbols. The default value is 1.

An argument specifying the symbol to be used when a classificatiion has not been specified for the data. The default value is a small dot ".".

A logical variable or `NULL`

indicating whether or not to add a title
to the plot identifying the dimensions used.

Other graphics parameters.

`clPairs`

,
`coordProj`

,
`mclust2Dplot`

,
`mclust.options`

```
# \donttest{
est <- meVVV(iris[,-5], unmap(iris[,5]))
par(pty = "s", mfrow = c(1,1))
randProj(iris[,-5], seeds=1:3, parameters = est$parameters, z = est$z,
what = "classification", main = TRUE)
randProj(iris[,-5], seeds=1:3, parameters = est$parameters, z = est$z,
truth = iris[,5], what = "error", main = TRUE)
randProj(iris[,-5], seeds=1:3, parameters = est$parameters, z = est$z,
what = "uncertainty", main = TRUE)
# }
```

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