Announcements

• Quiz 1 graded and returned.

• HW1 graded. Merge the pull request from the grading branch to your master branch. Pull request is also a perfect place for discussion about the grading.

Feedback on HW1

• Q3: @fastmath

• Q5: readdlm and readcsv are useful for reading tabulated data in text files. Collinearity is a concern from the descriptive statistics.

• Q6: Looping order. Julia storage is column-major, so ji looping is peferred over ij looping.

• Use .gitignore to exclude files from version control. For example, putting a line */.ipynb_checkpoints in .gitignore ignores auxillary files generated by Jupyter notebook.

Last time

• LU decomposition (cont’d).

• Cholesky decomposition.

Today

• Cholesky decomposition (cont’d).

• QR decomposition.

• Sweep operator.