Ductile and brittle materials

A testing machine has pulled two rods until they broke: a mild steel rod (A) and a glass-like rod (B). You have each one's readings of strain and stress. You will make the program find each one's Young's modulus and greatest stress, and decide which material is ductile.

The idea. On the straight start of the graph, $Y = \dfrac{\text{stress}}{\text{strain}}$. The greatest stress is the top of the curve. A ductile material stretches a long way past its elastic limit before it breaks; a brittle one breaks soon after.

Your tasks.

1. Find Young's modulus of each, in GPa, from its first reading after zero.
2. Find the greatest stress each one reached, in MPa.
3. Compare the strains at which they broke, and set ductile to "A" or "B".