Used extensions:
UNIQUE remove duplicate data in a list.
https://community.appinventor.mit.edu/t/remove-duplicate-data-from-a-list-in-app-inventor/50581
File Tools
https://community.kodular.io/t/filetools-some-tools-to-work-with-files/40051
Procedure: MaxMinTools
https://community.kodular.io/u/WatermelonIce/summary
Input data:
x,y data, stored in XY list e.g. pair 𝛔,ε import from an UTM (Universal Testing Machine) or load, deformation, P,f .
data are stored in lists for all data, including geometrical data. Correction of input data is made in other section.
input data can be imported from a CSV (Comma Separated Value) or a Google spreadsheet