Instruct: Classify Amazon reviews into positive or negative sentiment
Query: excellent book

I used this book in two undergrad courses , signals & systems and DSP the author did a pretty good job in explaining the mathematics needed for the course in the first chapter. As a begginer, who new nothing about signals and systems or dsp the language is simple, he made complicated ideas more than understandable he uses modern day examples to convey complicated ideas. Very good reference to have, if you are a student who really wants to know the if's and the why's this is the book for you, on the other hand if you wish to put your hands on immediate info on most topics in sygnals and systems this is it. Go buy it,its a must have.