Instruct: Classify Amazon reviews into positive or negative sentiment
Query: A Very Poor Textbook.

In taking an Engineering Electromagnetics course, I was very disappointed with the instruction of the course; therefore I turned to this textbook for help. Unfortunately, this book is packed with errors, both in the text, and more commonly the end of chapter problems. For such a theoretical subject, the explanation is lacking, and example problems are few and far between. In addition, there are no answers in the back of the book, and the answers available online or on CD-ROM are not all correct, according to my professor. Sigh. All in all, these factors combined to make this a very difficult course, the worst that I have had in my 3.5 years of engineering education.