Principal Component Analysis (PCA) in MATLAB

This is a demonstration of how one can use PCA to classify a 2D data set.

Description

This is a demonstration of how one can use PCA to classify a 2D data set. This is the simplest form of PCA but you can easily extend it to higher dimensions and you can do image classification with PCA

PCA consists of a number of steps:
 - Loading the data
 - Subtracting the mean of the data from the original dataset
 - Finding the covariance matrix of the dataset
 - Finding the eigenvector(s) associated with the greatest eigenvalue(s)
 - Projecting the original dataset on the eigenvector(s)

Note: MATLAB has a built-in PCA functions. This file shows how a PCA works

• MATLAB release: MATLAB 7.5 (R2007b)
• Other requirements: I wrote it on Matlab 7.5.0

[Tobias malach]

Thanks! This helped me to understand what PCA actually is about

[zhu zhu]

thanks!

[Adams Black]

 

[Adams Black]

Good! but can i use it for image classfication pls?