Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Disappointing

I was disappointed. Through the middle of chapter 3, the text was excellent, than the end of chapter 3 was totally cryptic. Chapter 4 was ok, so was most of chapter 5, but chapter 6 and on was just horrible. I couldn't understand a thing. SVD is not explained in any detail, neither is Jordan form. This book is a waste of money, since only about half of it is good and the rest is useless. I'd recommend Howard Anton's book, it costs less, and there's much more material in there.