# \#csp-unit-2-lesson-2 **URL:** https://forum.code.org/tag/csp-unit-2-lesson-2/283.md [Latest](https://forum.code.org/latest.md) · [Categories](https://forum.code.org/categories.md) · [Tags](https://forum.code.org/tags.md) --- ## [Extension: Video Explaining LZW Compression](https://forum.code.org/t/extension-video-explaining-lzw-compression/31129)
**Author:** [@sean.glantz](https://forum.code.org/u/sean.glantz)\ **Replies:** 0\ **Last updated:** [October 6, 2019, 3:44pm UTC](https://forum.code.org/t/extension-video-explaining-lzw-compression/31129 "2019-10-06T15:44:19Z")
Here is an 11 minute video that does a nice job of giving an overview to LZ(W) compression. I think it can help students connect their heuristic to how a computer can tackle this type of problem, and may be a bit more ac… --- ## [Lyrics and music video - extension](https://forum.code.org/t/lyrics-and-music-video-extension/6032)
**Author:** [@jonbagby15](https://forum.code.org/u/jonbagby15)\ **Replies:** 4\ **Last updated:** [October 10, 2018, 4:23am UTC](https://forum.code.org/t/lyrics-and-music-video-extension/6032 "2018-10-10T04:23:07Z")
Here are the lyrics and music video for a great song that lends itself to text compression. https://www.google.com/search?safe=active&q=heuristic&ie=utf-8&oe=utf-8#safe=strict&q=who+put+the+bomp+lyrics --- ## [Compression Heuristic](https://forum.code.org/t/compression-heuristic/20405)
**Author:** [@rgupta](https://forum.code.org/u/rgupta)\ **Replies:** 1\ **Last updated:** [October 10, 2018, 4:19am UTC](https://forum.code.org/t/compression-heuristic/20405 "2018-10-10T04:19:31Z")
The heuristic I developed is to consider first a repeated phrase, compress it, then a repeated sequence of phrases, and compress those, and to then look for more simple terms and to compress. Generally, I’m looking at la… --- ## [U2L02, Activity 1 vs. Activity 2](https://forum.code.org/t/u2l02-activity-1-vs-activity-2/20250)
**Author:** [@jdkramis](https://forum.code.org/u/jdkramis)\ **Replies:** 2\ **Last updated:** [September 27, 2018, 11:18am UTC](https://forum.code.org/t/u2l02-activity-1-vs-activity-2/20250 "2018-09-27T11:18:13Z")
Hi everyone! I’m a bit confused about the difference between Activities 1 and 2. Is the heuristic intended to be used on a variety of poems, or just one? If it’s just one, how is the second activity different than the f… --- ## [Heuristics for Text Compression](https://forum.code.org/t/heuristics-for-text-compression/19446)
**Author:** [@derek.babb](https://forum.code.org/u/derek.babb)\ **Replies:** 1\ **Last updated:** [September 20, 2018, 4:37pm UTC](https://forum.code.org/t/heuristics-for-text-compression/19446 "2018-09-20T16:37:31Z")
In my experience, students are pretty good at developing a compression that works well with a specific text or song, but they really struggle to find a method that is applicable to every situation. Things I like to get … --- ## [Animation of lzw in action](https://forum.code.org/t/animation-of-lzw-in-action/17929)
**Author:** [@jreilly2016](https://forum.code.org/u/jreilly2016)\ **Replies:** 1\ **Last updated:** [July 26, 2018, 6:24am UTC](https://forum.code.org/t/animation-of-lzw-in-action/17929 "2018-07-26T06:24:22Z")
The link in unit 2 lesson 2 wrap up on .zip and lzw compression says it can’t load the page for me? Is there a new link? Jim --- ## [Lesson 2.2--Heuristics](https://forum.code.org/t/lesson-2-2-heuristics/15717)
**Author:** [@robgingery](https://forum.code.org/u/robgingery)\ **Replies:** 0\ **Last updated:** [April 21, 2018, 10:52pm UTC](https://forum.code.org/t/lesson-2-2-heuristics/15717 "2018-04-21T22:52:16Z")
I looked for common patterns with in the lyrics. Then after find 2 or 3 frequently used lyrics, I then focused on combining common patterns and replacing those symbols with a new symbol. When I taught this lesson, my… --- ## [Heuristics in Lesson 2.2](https://forum.code.org/t/heuristics-in-lesson-2-2/14493)
**Author:** [@soldenkamp](https://forum.code.org/u/soldenkamp)\ **Replies:** 0\ **Last updated:** [February 18, 2018, 1:00am UTC](https://forum.code.org/t/heuristics-in-lesson-2-2/14493 "2018-02-18T01:00:44Z")
My heuristic: 1. I looked for patterns, and compressed phrases that repeated. This might include patterns from items I added to the dictionary. My compression rate was 35.9% There is a tipping point to the text compre… --- ## [17-18 Text Compression](https://forum.code.org/t/17-18-text-compression/9922)
**Author:** [@susan.james](https://forum.code.org/u/susan.james)\ **Replies:** 2\ **Last updated:** [February 18, 2018, 1:00am UTC](https://forum.code.org/t/17-18-text-compression/9922 "2018-02-18T01:00:43Z")
The text I chose to compress: A\_tutor\_who\_tooted\_the\_flute\_Tried\_to\_tutor\_two\_tooters\_to\_toot\_Said\_the\_two\_to\_their\_tutor,"Isit\_harder\_to\_toot\_Or\_to\_tutor\_two\_tooters\_to\_toot?" My compression: A\_​:comet:who​:sunny:ed☇f… --- ## ['16-'17 General Discussion for Lesson 2.2](https://forum.code.org/t/16-17-general-discussion-for-lesson-2-2/5149)
**Author:** [@brook](https://forum.code.org/u/brook)\ **Replies:** 5\ **Last updated:** [February 25, 2017, 2:03am UTC](https://forum.code.org/t/16-17-general-discussion-for-lesson-2-2/5149 "2017-02-25T02:03:34Z")
Use this thread to discuss your questions and comments about how to run the lesson. --- ## [Computationally Hard](https://forum.code.org/t/computationally-hard/5537)
**Author:** [@wbarnum](https://forum.code.org/u/wbarnum)\ **Replies:** 1\ **Last updated:** [September 21, 2016, 2:07pm UTC](https://forum.code.org/t/computationally-hard/5537 "2016-09-21T14:07:49Z")
The lesson states that "The lesson touches on computationally hard problems" When it says hard, what is the specific level of hardness? Would it be considered NP-Hard? Thanks, Bill --- ## ['15-'16 Text Compression](https://forum.code.org/t/15-16-text-compression/574)
**Author:** [@jessica\_opaleski\_for](https://forum.code.org/u/jessica_opaleski_for)\ **Replies:** 83\ **Last updated:** [December 29, 2015, 9:04pm UTC](https://forum.code.org/t/15-16-text-compression/574 "2015-12-29T21:04:34Z")
Use this as a space to record your feedback and questions about this lesson.