Viewing profile — avitzur

Good times, good times.

Well howdy, old-timer! That brings back some memories. (The '80s: after the dinosaurs, but before the giant armored sloths - back when neutrinos were massless and Λ was zero.) Did …

You're welcome

Erin Ottmar's https://graspablemath.com is probably the best modern exploration of the idea.

At Apple? None whatsoever. It was a surprising fluke that even in the Apple of 1993. It only succeeded because so many people helped. That Apple was beleaguered at the time may hav…

Btw, I wrote that, Ask Me Anything.

Amy O'Leary tells my favorite version of this story on This American Life: https://www.thisamericanlife.org/284/should-i-stay-or-should...

Yes, the numeric evaluation is vectorized via the Accelerate Framework's vForce and vDSP APIs. That is a significant performance improvement. The numeric evaluation remains a hotsp…

Applications / Utilities / Grapher is a different application (formerly Curvus Pro X from Arizona Software) which replaced the original Mac OS 7 Apple menu Graphing Calculator beca…

That thread describes me working through performance issues in the initial port eight months ago. Those cases perform adequately now. Parsing is not a bottleneck. Walking the bytec…

Thank you! I can't believe that was thirty years ago. It feels unreal.

The math is internally represented as a tree for display and editing. Most of the performance critical code is the numeric evaluation when graphing. For that, the math is compiled …

Most of the performance critical sections are numeric computation loops. I use the Unsafe APIs where profiling shows that the bounds-checking overhead is significant. In principle,…

I wrote the blog post. AMA.

It has been in continuous development since 1985. Before the port, parts were in C, C++, Objective-C, and Objective-C++, as well as Lex, Yacc, GLSL, and Python. Will do the top-lev…

Yes, precisely. I looked into bridging to C++ initially, but it was impractical.

Still working on it. https://www.youtube.com/watch?v=m5h9KPkJ7eE

THANK YOU!!!

We were trying to build an iPad with 1992 technology. http://arno.org/arnotify/2010/01/penmac/

Thank you!

50, and still programming on the same codebase I started when I was 18.

Yes, as well as FullWrite and many other products.

http://www.pacifict.com/images/nyt.jpg

When the hardware failure is more frequent than failures in your software, we can consider that "good enough" (for consumer-level applications.)

I started programming on an HP-65 in the 70's. That was before graphing calculators, though.