Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Too jumpy

As a student learning about signals and systems I needed a text that would supplement the teacher's lecture and help me learn more in-depth about the topic. This text only skims the surface of every topic, as if to give a brief overview. Also, it talks about certain topics early on, but does not go further into the topic until several chapters later in the book. So several chapters later, you are jumping back and forth trying to reference the illustrations from long ago with the topic being discussed currently. Though several references were made concerning an Appendix, a thorough search of the book failed to produce one. So all of the topics that say "go to Appendix B for further discussion", are not covered very much at all. I only opened this book a few times, if at all, during my entire semester. It was not worth what I paid for it.