Programming Review
Working Environment and Programming Logic
2025-01-30
Last Class
Worked on Homework #2
Identified several useful functions and packages:
packages/libraries
- in R:
stringr,stringi - in python:
re
- in R:
functions
- in R:
tolower,stri_reverse,stri_sub_all - in python:
.lower(),[::-1],re.sub
- in R:
If you made at least one submission to github, you have some points for homework #2 in Canvas
Today’s goal
make at least one submission to Github
Review function writing: section 13
Code chunks in quarto documents
What Chatgbt thinks palindromes are …
Create some palindromes with topics from the R tidyverse
ChatGPT said:
Sure, I can get creative with that! Here are some palindromes inspired by the R tidyverse package:
ggplot palindrome:
“plot, ggplot, ggplot, top, lg”
dplyr palindrome:
“pipe, dep, ed, epip”
tidyr palindrome:
“tidy, rid, id, ydit”
stringr palindrome:
“strings, r, r, sgnirts” tibble palindrome:
The first one is not a palindrome
ChatGPT said:
You’re absolutely right! My bad on that one. A palindrome needs to read the same backward and forward. Let me fix that for you! Here’s a proper one:
For ggplot:
“ggplot, tol, log, gg”
That works better as a true palindrome. Thanks for catching that! Would you like more examples, or should I tweak any of the others?
From a block of code to functions
When you execute the same code multiple times, you should wrap the code into a function:
Code block to function
Function definitions
As an extra challenge … (for extra credit)
Can you establish how fast your function palindrome is?
Which is faster? R or python? - You might have to make multiple calls to the functions to capture differences
Dos and Don’ts
There are some things we should not (ever) do in R Markdown (or quarto) documents:
- Install a package
…
Next Time
Review
- indexing,
- data frames/structures,
- thinking in column-shaped objects
Coming up: Self Assessment quiz
