sort data (periodic)

Hi all 😀

I have a data group from excel

to understand:

the 1st column is : Torque

the 2 column is : Position

the 3 column velocity: Torque

If i make a drawing with Torque (vertical Y axis)  and position (horizontal  X axis), i have this:

I see  i have periodic data :

in position , approximately from 50 to 2250 milimeter.

this is OK, the data relate to a cylinder which makes round trips

My problem:

How to extract data in new matrix wich include only data for one stroke:

submatrix for positionning

50 to 2250

and submatrix for positionning

2250 to 50

and that for the 5 back and forth

I want to make a drawing for forth (torque and velocity)

and back (torque and velocity)

Thanks