2. At this time, all characters are deleted, leaving only useful data values.

3. Remember the address of this folder, which will be used as the path read by matlab.

4. At this time, use a textread function, which is internally substituted into the txt file path just now.

5. The 5.textread function will read these data as vector 1. We divide it into two columns, represented by x and y, and save it as a matrix.