Interaction plot for grouped data

`interactionplot(Y,GROUP)`

interactionplot(Y,GROUP,'varnames',VARNAMES)

[h,AX,bigax] = interactionplot(...)

`interactionplot(Y,GROUP)`

displays the two-factor
interaction plot for the group means of matrix `Y`

with
groups defined by entries in the cell array `GROUP`

. `Y`

is
a numeric matrix or vector. If `Y`

is a matrix, the
rows represent different observations and the columns represent replications
of each observation. If `Y`

is a vector, the rows
give the means of each entry in the cell array `GROUP`

.
Each cell of `GROUP`

must contain a grouping variable
that can be a categorical variable, numeric vector, character matrix,
or a single-column cell array of character vectors. `GROUP`

can
also be a matrix whose columns represent different grouping variables.
Each grouping variable must have the same number of rows as `Y`

.
The number of grouping variables must be greater than 1.

The interaction plot is a matrix plot, with the number of rows
and columns both equal to the number of grouping variables. The grouping
variable names are printed on the diagonal of the plot matrix. The
plot at off-diagonal position (*i*,*j*)
is the interaction of the two variables whose names are given at row
diagonal (*i*,*i*) and column
diagonal (*j*,*j*), respectively.

`interactionplot(Y,GROUP,'varnames',VARNAMES)`

displays
the interaction plot with user-specified grouping variable names `VARNAMES`

. `VARNAMES`

is
a character matrix or a cell array of character vectors, one per grouping
variable. Default names are `'X1'`

, `'X2'`

,
... .

`[h,AX,bigax] = interactionplot(...)`

returns
a handle `h`

to the figure window, a matrix `AX`

of
handles to the subplot axes, and a handle `bigax`

to
the big (invisible) axes framing the subplots.

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