find first and last index below threshold in a vector

Hello,

I've a vector of s-parameters results that contains >1000 elements. I want to mesure the bandwidth of the impedance matching of my circuit. My vector has a bunch of negative values and I want to see the intervals where those values are below -10.

I want to see the first index below -10 and the last one of an given interval. Meaning that if for example I have -10 between the points 130 and 200 I want to have a results to be FirstIndex = 130, LastIndex = 200.

How can I accomplish this in R2020a?

Answer 1

[dpb]

Use find