NIPALS algorithm

Principal components analysis.

Description

This m-file give you the Nipals algorithm to realize a Principal Components Analysis for statistical study. I realize this program specifically with an aim of analysis spectroscopic data. Use 'help' for description

• MATLAB release: MATLAB 5.3 (R11)

[Castor Power]

Very good program !!! thank you very much, i would have spend time to make my own algo if i didn't find it !!!!

[Graciela Martínez]

This function presented the follow error:

Undefined function or variable 'pc'.

Error in ==> nipals2.m
On line 89 ==> pc = [ pc ( 100 * ( varl - var ) / varo ) ];

[Denis Bichsel]

Just nothong a lot of error, no indication
on the variable, no comment

[Matthias Wetzel]

This function presented the follow error: Undefined function or variable 'pc'. Error in ==> nipals2.m On line 89 ==> pc = [ pc ( 100 * ( varl - var ) / varo ) ];

[friend good]

NIPALS - Non-linear Iterative Partial Least Squares. see S. Wold and S. Martens
PCA- Principal components analysis.

[goops k]

Good job

[Pedro Vagos]

You need to initialize the variable "pc" in the beginning of the code ( pc=[]; ). Also, a ";" is missing in line 56.
Otherwise it works fine.

[Stefan Krämer]

You need to change

%Lprinc=ones(nbp,length(E));
Lprinc=ones(nbp,size(E,2));

in order for the code to work for more observations than variables on newer versions of MATLAB.

[Fahd Bouzaraa]

This is just a waste of time, there are plenty of errors..