Update 18.337 2026 homework 2.md

Author: alanedelman

18.337 2026 homework 2.md

@@ -1,5 +1,6 @@
 ---
-# 18.337 Homework 2:  HPC and  Sensitivity Analysis and Automatic Differentiation
+# 18.337 Homework 2:  Performance, Sensitivity Analysis and Automatic Differentiation
+Due Thursday March 5, but start early.  Your quiz will come from part of this homework. 
 
 ## Overview
 
@@ -11,7 +12,7 @@ adding two n x n matrices.  Express the leading term in the answer as C * n^e.
 Use `@belapsed` from `Benchmarktools.jl` to get the performance of both in function
 of the input matrix size. Compare the following four operations for small and large
 matrices, in powers of 2, from 2 to at least 216 (and by preference much larger until
-you run out of patience or memory).
+you run out of patience or memory).  Compare theory with practice. YMMV.
 
 ```julia
 # define n =