# Tag Archives: video

July 18, 2012, 9:44 am

# For proofs, just click “play”

This week I am adding to the playlist of screencasts for the inverted intro-to-proofs class I first mentioned here. There are seven chapters in the textbook we are using and my goal is to complete the screencasts for the first three of those chapters prior to the start of the semester (August 27). Yesterday I added four more videos and I am hoping to make four more tomorrow, which will get us through Chapter 1.

The four new ones focus on conditional (“if-then”) statements.  I made this video as the second video in the series as a prelude to proofs, which are coming in Section 1.2 and which will remain the focus of the course throughout. Generally speaking, students coming into this course have had absolutely no exposure to proof in their background with the exception of geometry and maybe trigonometry, in which they hated proofs. Watch a part of this and see if you can figure out my …

August 21, 2010, 6:50 pm

# This week in screencasting: Contour plots in MATLAB

By my count, this past week I produced and posted 22 different screencasts to YouTube! Almost all of those are short instructional videos for our calculus students taking Mastery Exams on precalculus material. But I did make two more MATLAB-oriented screencasts, like last week. These focus on creating contour plots in MATLAB.

Here’s Part 1:

And Part 2:

I found this topic really interesting and fun to screencast about. Contour plots are so useful and simple to understand — anybody who’s ever hiked or camped has probably used one, in the form of a topographical map — and it was fun to explore the eight (!) different commands that MATLAB has for producing them, each command producing a map that fits a different kind of need. There may be even more commands for contour maps that I’m missing.

I probably won’t match this week’s output next week, as I’ll be on the road in

January 30, 2010, 12:22 pm

# Fractal Doritos!

Students and faculty at University Preparatory School in Redding, CA have created the world’s largest Sierpinski triangle constructed entirely out of Doritos. (Well, it’s probably the only one, but still.) It is 64 feet long and made out of 12,000 Doritos. This was done as an entry to the Doritos Crash the Superbowl contest. Watch, and be awed:

Can a 128-, 256-, etc. foot long Dorito Sierpinski triangle be far behind? I bet the parent company for Doritos would seriously consider some corporate sponsorship.

Thanks to Cory Poole, math and physics teacher at U-Prep, who sent this in. That’s a great, creative way to get students interested in math. (And you can eat it when it’s done.) There’s more on the video here.

February 13, 2008, 9:55 am

# Tuesday quick shots

Work has been more active than usual lately with some protracted Promotion and Tenure Committee business on top of a 14-hour course load this semester, so pardon the light blogging. I do have a few quick thoughts:

• No, I didn’t watch the Jericho season 2 premiere last night yet. 10:00 Eastern is way past my bedtime. I do have it on the DVR at home, though, so once the kids are in bed tonight I’ll be digging in. The entire first episode is online already, so maybe I’ll get a headstart if I ignore enough of my work get a break today.
• I’ve been spending my post-kids-in-bed time at home this week watching season 1 of LOST at ABC’s website. Corey at Ubiquitously notes the huge quality difference between ABC’s online video player, which streams HD video full-screen, and CBS’s Innertube player. ABC’s version is really very impressive, with a crisp, DVD-quality presentation, non-irritating…
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