about rectify code and data

[glowboy0]

Hello, thank you for taking the time to respond. Wishing you smooth work and everlasting happiness in your family!
My ECG data file is in txt format, approximately like this: Each data point is spaced 1ms apart
0 0 0 0 0 270 455 952
1 0 0 0 0 270 454 952
2 0 0 0 0 270 454 952
3 0 0 0 0 270 457 952
4 0 0 0 0 270 462 952
5 0 0 0 0 270 469 952
6 0 0 0 0 270 478 952
7 0 0 0 0 270 489 952
8 0 0 0 0 270 501 952
9 0 0 0 0 270 515 952
10 0 0 0 0 270 529 952
11 0 0 0 0 270 545 952
12 0 0 0 0 270 562 952
13 0 0 0 0 270 580 952
14 0 0 0 0 270 598 952
15 0 0 0 0 270 616 952
0 0 0 0 0 270 632 952
1 0 0 0 0 270 646 952
2 0 0 0 0 270 658 952
3 0 0 0 0 270 668 952
I'm having trouble reading my data with MATLAB because your sample data is in "dat" format. How should I modify my data?