13.6) Finding MATLAB Functions

Matlab has several tools to help users find a function. Consider if we want to find a function that will allow us to visualize multivariate data. First let's search for the string "multi variate":

[matlab]
>> lookfor('multi variate')
...
mvregresslike - Negative log-likelihood for multivariate regression.
mvtcdf - Multivariate t cumulative distribution function (cdf).
mvtpdf - Multivariate t probability density function (pdf).
mvtrnd - Random matrices from the multivariate t distribution.
parallelcoords - Parallel coordinates plot for multivariate data.
mvplotdemo - Visualizing Multivariate Data
wmulden - Wavelet multivariate denoising.
wmuldentool - Wavelet Multivariate Denoising GUI.
dguiwmspca - Demonstrates Multivariate Wavelet PCA tool in the Wavelet Toolbox.
dguiwmul - Demonstrates Multivariate denoising tool in the Wavelet Toolbox.
wmuldendemo - Multivariate Wavelet Denoising.
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We can then look at the help file for the "mvplotdemo" function

[matlab]
>> help mvplotdemo
Visualizing Multivariate Data
Many statistical analyses involve only two variables: a predictor
variable and a response variable. Such data are easy to visualize using
2D scatter plots, bivariate histograms, boxplots, etc. It's also
possible to visualize trivariate data with 3D scatter plots, or 2D
scatter plots with a third variable encoded with, for example color.
However, many datasets involve a larger number of variables, making
direct visualization more difficult. This demo explores some of the ways
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