How do I find first point of inflection in a plot created by array data.

Hello

I have two arrays by which i plot a 2d graph. I want to find first point of inflection(first minimum value). how do I find it.

There are 250 rows in a array.

On x axis its time from 1ms to 250 ms. and on y axis there is resistance calculated.

here is the sample of graph.

[dpb]

findpeaks comes to mind...