Announcement

  • Instructor OH: Tue 12pm-1pm, Thu 2pm-3pm 3pm-4pm @ CHS 21-254A.

  • HW1 due this Friday (10/4) 11:59pm on Gradescope/BruinLearn.

  • HW2 posted and due next Friday (10/11) 11:59pm on Gradescope/BruinLearn.

  • Does L0 “norm” satisfy the triangle inequality? Yes, because $1{x_i+y_i \ne 0} \le 1{x_i \ne 0} + 1_{y_i \ne 0}$ for all $i$.

  • Q: Does computer speed depend on computer languages? Totally; see 257 notes.

  • More on computer arithmetic: 257 notes.

  • Q: Why dividing by $n$ in std formula? See here.

  • How did I author the lecture notes?

Today

  • Vectors (BV Chapters 1-3) cont’d.

  • Matrices (BV Chapters 6-10).