M = readtable('highstrain.csv');
ultimate_strength = max(stress);
elongation = max(strain);
I have true_stress vs strain curve ploted in MATLAB. I want to find yeild stress from this curve and plot just strain hardening part (e.g, from yield point stress to ultimate stress). Please let me know what I should do and which code and function I should use, since I am quit new to MATLAB.