The most epic of Pi Days occurs tomorrow, 3.14.15…
While round pancakes are somewhat rare in our house, the kids and I decided to make an exception and do some flapjack math to celebrate the occasion.
I’ve been working on making spirographic pancakes lately – Spirocakes. Here’s the latest iteration of the “Pangraph,” a ring gear that fits over the frying pan and acts just like the old Spirograph toy:
It’s time-consuming to cut out the gears, so I didn’t want to just make random ones. It was fun to work out which gears would make the most interesting patterns and be compatible with both the 35- and 36-tooth ring gears.
I even got to make use of the program I wrote 10 years ago to draw these patterns (technically called hypotrochoids and epitrochoids), to see what kinds of patterns I could expect to see with different gear sizes.
But transferring a calculator ROM to a phone isn’t fun and games. I enthusiastically began following the steps I found online, but they ended up requiring an older (32-bit) operating system. Luckily I had an old laptop on hand, and got a little further, but kept running into problems and never did get a ROM off a calculator. I finally resorted to the most obvious solution and Googled it.
I tried AndieGraph first, which happily pretended to be a TI-85 and TI-86 without problems. You can even write your own programs, but there’s no way to import other programs. True to the original, the function plotter takes its sweet time.
Next I tried Graph89, which included this interesting note in the description:
Firmware updates (*.89u, 9xu, *.v2u, *.8Xu) which are normally used to restore the operating system of your calculator can also be used as a ROM image.
Sure enough, the operating systems freely available from TI (this TI-89 download, for example) can be used with this program. You also get the capacity to import programs and apps, change the CPU speed and display color, among other settings. The screen is a little nicer to look at than AndieGraph’s (and plotting functions is nice and fast), but it doesn’t support the 85 or 86. I found that the arrow keys sometimes seem to register multiple presses, which is particularly annoying when writing programs.
Epic Rap Battles of History released a new classic yesterday, in which Newton battles Bill Nye. The only way to improve on this would be if Weird Al played Newton – oh yeah, he did. “To rebut,” Newton provides an equation he supposedly wrote, which is actually a silly calculus limerick:
The integral sec y dy
From zero to one-sixth of pi
Is log to base e
Of the square root of three
To the 64th power of …
Luckily Neil deGrasse Tyson appears to finish the calculus limerick: “i"