1D threshold giving me zero

[TylerHoot13]

I am trying to use the 1D Threshold to give me the x index of the y values in order to find the time constant; however, the 1D Threshold is giving me zero when there clearly is that value in the data. Anyone know why it is doing that?

Thank you

[crossrulz · Accepted solution]

Read the documentation.  Threshold 1D Array expects a constantly increasing array.  And since your first point in the array is larger than your given threshold, it says that 0 is the first point that exceeds your threshold.

You could reverse the array and then subtract the result from the number of points in the array to get your desired index.