Introduction - If you have any usage issues, please Google them yourself
First talk about what is meant by sparse matrix. You said that the issue it is very simple, you must do not know more than taking the academic battle in China, the word for a " dig out" will lead to two opposite conclusion. This is the Tsinghua University in 2000 to join the study section of the title: " that a 1000 peak, while the 1000 has the adjacency matrix to map the number of matrix elements? Is sparse matrix?" If you come up with a title like the psychological activities , you can see there are two traps is to let the people obviously got the wrong answer, I do not want to say what is left to readers to ponder