General

MATLAB FAQ
http://www.utexas.edu/cc/math/Matlab/Manual/faq.html

Tutorials

Introduction to MATLAB
http://eewww.eng.ohio-state.edu/~juodvalk/ee281/matlab/matlab.html

MATLAB Primer  Third edition (Sigmon)
http://mathlab.usc.edu/help/MATLABprimer.pdf

MATLAB Tutorial (Carlson)
http://www.sdsmt.edu/syseng/ee/courses/ee312/tutorial2.pdf

FIlter Design

Quantized Filtering Toolbox (Filter Design Toolbox)
http://uw.physics.wisc.edu/~nextroom/matlab_help/pdf_doc/qfilter/quantized.pdf

MATLAB filter design example
http://www.coe.uncc.edu/~tpweldon/courses/eegr4124/matlab/matlab.html

Digital Filtering Lab
http://fubini.swarthmore.edu/~ceverba1/Filtering.html

Filter design command list
http://www.systems.caltech.edu/EE/Courses/EE112/command_list

Discret-time filter design
http://bass.gmu.edu/~kwage/ece320/fall00/proj3.pdf

IIR Filter Designs
http://www.ee.cityu.edu.hk/~labinfo/manual/level3/EE32211ML4.pdf

Digital FIlter Functions in Matllab
http://www.image.cityu.edu.hk/matlab/mat_ans/filter.html

Digital filter Design (FIR & IIR)
http://www.s2.chalmers.se/~irenegu/dsp00_03.pdf

Textbook: Structure and interpretation of signals and systems
http://ptolemy.eecs.berkeley.edu/~eal/eecs20/supplements/master.pdfhttp://ptolemy.eecs.berkeley.edu/~eal/eecs20/week14/lab.pdf

FIR & IIR Filter (MATLAB & C)
http://www.eng.iastate.edu/ee424/labs/IIRfilter/IIR_Filter_Lab.pdf
http://www.eng.iastate.edu/ee424/labs/FIRfilter/

Analog-to-Digital Filter Transoformation
http://www.image.cityu.edu.hk/course/ee2235/notes/iir2.pdf

Signal representation
http://www.ecn.purdue.edu/ECN/FAQ/applications/matlab/matlab.tutorials/slides.pdf

Carnegie-Mellon:
http://www.ece.cmu.edu/~ee551/Handouts/ee551.3.1-25.pdf

FIR and IIR Filter Design Algorithms
http://www-dsp.rice.edu/software/RU-FILTER/index.html

Interactive filter design (non-MATLAB)
http://www-users.cs.york.ac.uk/~fisher/mkfilter/