Monthly Archives: March 2017

Generating the Mandelbrot Set with PearDeck

One of the benefits of being a digital packrat having a digital file cabinet is that every old file can be a starting point for something new.

In PreCalculus, I decided to do a short conic sections unit to fill the awkward two weeks between the end of the third quarter and the start of spring break. We've centered all of our conversations around the idea of a locus of points. I realized yesterday afternoon that the Algebra 2 activity I described here would be a great way to have some inquiry and experimentation on the day before break.

The online collaborative tools have improved considerably since 2012 when I first did this. I put much of the lesson into Google Docs and PearDeck which made sharing answers for the final reveal much easier. Here's what the students had for values that either "escaped" or were "trapped" in the Complex Plane:

I compared this to the pixelated Mandelbrot set I hacked together in Processing from Daniel Shiffman's code five years ago. Still works!

You can access the entire digital lesson with links as a Google Doc here.

My Reassessment Queue

We're almost at the end of the third quarter over here. Here's the current plot of number of reassessments over time for this semester:

I'm energized though that the students have bought into the system, and that my improved workflow from last semester is making the process manageable. My pile of reassessment papers grows faster than I'd like, but I've also improved the physical process of managing the paperwork.

While I'm battling performance issues on the site now that there's a lot of data moving around on there, the thing I'm more interested is improving participating. Who are the students that aren't reassessing? How do I get them involved? Why aren't they doing so?

There are lots of issues at play here. I'm loving how I've been experimenting a lot lately with new ways of assessing, structuring classes, rethinking the grade book, and just plain trying new activities out on students. I'll do a better job of sharing out in the weeks to come.