用TEXTSCAN进行文件操作，创建和关闭文件流，并结合其他的处理过程，完成相应数据功能-This example shows how to read an arbitrary format text file with textscan. This function is similar to textread, however it also allows you to read the file one block at a time, and each block can have a different format. The information in the text file test80211.txt is the result　a wireless network communication quality test. Each block is a different environment (e.g., mobile, indoor, outdoor). The numerical results show the data error rate over a range of noise levels for a number of independent tests.