andrewsplot
Andrews plot
Syntax
andrewsplot(X)
andrewsplot(X,...,'Standardize',standopt)
andrewsplot(X,...,'Quantile',alpha)
andrewsplot(X,...,'Group',group)
andrewsplot(X,...,'PropName',PropVal,...)
andrewsplot(ax,X,...)
h = andrewsplot(X,...)
Description
andrewsplot(X) creates an Andrews plot
of the multivariate data in the matrix X. The rows
of X correspond to observations, the columns to
variables. Andrews plots represent each observation by a function f(t)
of a continuous dummy variable t over the interval
[0,1]. f(t) is defined for the ith
observation in X as
andrewsplot treats NaN values
in X as missing values and ignores the corresponding
rows.
andrewsplot(X,...,'Standardize', creates
an Andrews plot where standopt)standopt is one of
the following:
'on'— scales each column ofXto have mean0and standard deviation1before making the plot.'PCA'— creates an Andrews plot from the principal component scores ofX, in order of decreasing eigenvalue. (Seepca.)'PCAStd'— creates an Andrews plot using the standardized principal component scores. (Seepca.)
andrewsplot(X,...,'Quantile',alpha) plots
only the median and the alpha and (1 – alpha)
quantiles of f(t) at each value
of t. This is useful if X contains
many observations.
andrewsplot(X,...,'Group',group) plots the data in different groups with
different colors. Groups are defined by group, a numeric array
containing a group index for each observation. group can also be a
categorical array, character matrix, string array, or cell array of character vectors
containing a group name for each observation.
andrewsplot(X,...,
sets optional 'PropName',PropVal,...)Line object properties to the
specified values for all Line objects created
by andrewsplot. (See Line Properties.)
andrewsplot(ax,X,...) uses the plot axes
specified in ax, an Axes
object. (See axes.)
Specify ax as the first input argument
followed by any of the input argument combinations in the
previous syntaxes.
h = andrewsplot(X,...) returns a column vector of handles to the
Line objects created by
andrewsplot, one handle per row
of X. If you use the
'Quantile' input parameter,
h contains one handle for each of
the three Line objects created. If you use
both the 'Quantile' and the
'Group' input parameters,
h contains three handles for each
group.
Examples
Create Andrews Plot to Visualize Grouped Data
This example shows how to create an Andrews plot to visualize grouped sample data.
Load the sample data.
load fisheririsCreate an Andrews plot, grouping the sample data by species.
andrewsplot(meas,'group',species)
Create a second, simplified Andrews plot that only displays the median and quartiles of each group.
andrewsplot(meas,'group',species,'quantile',.25)
