lardbucket: 2009 : october


GraphSketch: 30,000 Graphs, and Parametric

Filed under: Ego, Hacks, Programming — aschmitz @ 9:41 am

Yesterday, GraphSketch passed over 30,000 graphs rendered. That’s quite a few. Thanks to everyone for making it so popular.

It also seemed like a good time to release something I’ve been working on smoothing out for the past few weeks:

GraphSketch ParametricYep, you can now graph parametric equations. Just head over to (or click the “Parametric”mode just above the equations on the main GraphSketch page).

To keep things simple, you can only graph three parametric sets of equations at the same time. You can choose the range for t, and it defaults to a reasonable -10 to 10.

Also, while I was updating the website, I made the text a bit smaller (about the difference of going from a 12pt font to a 10pt font) and added a (hopefully unobtrusive) section pointing out the availability of posters, should anyone be interested. Polar graphing should come soon, hopefully, but it is somewhat possible using parametric equations by setting x=r*cos(t) and y=r*sin(t), too.

Andy Schmitz



Filed under: Ego, Math — aschmitz @ 11:29 pm

A number of you who know me in real life have probably seen a number of my posters. Three of them currently adorn my dorm room. I had been offering them to friends I knew, but not to everyone, because I hadn’t gotten around to it. But that has changed now, with

The website itself is (purposely) a bit sparse, but it will let you browse the four existing posters, and grab one for yourself from Zazzle at fairly reasonable prices. (I really only make a few dollars from each one, depending on size.) Other than taking a while to ship, Zazzle’s processing has been fairly good, and the three large prints I have from them are reasonably high quality, even on their “basic poster” paper.

Each of the posters on was created by me, using a reasonably high-powered computer to do the rendering. Each of the posters is a mathematically-defined rendering, and could theoretically be rendered at any size and not lose any detail. Therefore, the large posters are still high quality images.

So, if you’d like to get a neat-looking poster and send a few dollars my way at the same time, have a look at

Andy Schmitz

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