How to find the corresponding locations in time from one graph's intercepts and zeros which is not plot versus time with another one which is plot versus time?

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Heirleking 2022-5-14

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https://ww2.mathworks.cn/matlabcentral/answers/1719425-how-to-find-the-corresponding-locations-in-time-from-one-graph-s-intercepts-and-zeros-which-is-not-p

编辑： Heirleking 2022-5-14

The first graph represents a displacement protocol from an experimental test for a structural element. After the test, the displacement is transformed into loading (force). Resulting in three graphs from this test: displacement vs. time, force vs. time, and force vs. displacement

Displacement vs Time

Force vs Time

I have found both the intercepts and zeros of the Force vs Displacement graph. Now, I am looking to correlate the intercepts and zeros with their respective positions in time from the previous graphs. Their positions in time will also mean the location in the array as time is t=1:1:403

Force vs Displacement Relation