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Desmos 3D graphing calculator

desmos.com

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Re: Desmos 3D graphing calculator

#71

Post by SAI_Peregrinus »

soegaard wrote: post #38
titaniumtown wrote: post #2

Desmos is the best, free (as in cost) and easily accessible graphing calculator out there. I wish it was opensource though. I've even tried to make an alternative and it's really hard to match their functionality (or I'm just inexperienced). I hope an opensource alternative crops up. Edit: Seems there has https://www.geogebra.org/

Commercial usage og Geogebra needs a license. https://www.geogebra.org/m/pR5DME5S#material/yumfrbjr I don't understand how their license and the GPL can co-exist?

Simple: don't accept outside contributions without a CLA. GPL doesn't ever restrict the copyright holder(s).

Re: Desmos 3D graphing calculator

#72

Post by Someone »

soegaard wrote: post #38
titaniumtown wrote: post #2

Desmos is the best, free (as in cost) and easily accessible graphing calculator out there. I wish it was opensource though. I've even tried to make an alternative and it's really hard to match their functionality (or I'm just inexperienced). I hope an opensource alternative crops up. Edit: Seems there has https://www.geogebra.org/

Commercial usage og Geogebra needs a license. https://www.geogebra.org/m/pR5DME5S#material/yumfrbjr I don't understand how their license and the GPL can co-exist?

https://www.gnu.org/philosophy/selling.en.html: “we encourage people who redistribute free software to charge as much as they wish or can”

Also, the engine is GPL-licensed, but the installer isn’t. https://www.geogebra.org/license#FAQ:

“How is GeoGebra licensed?

We license the different component parts of GeoGebra differently depending on their origin (authorship) and depending on your intended use of GeoGebra (see also next question)

- the source code is licensed under the GNU General Public License to ensure consistency with the various other pieces of software and libraries which are used within the GeoGebra source code (for a complete list of which see: https://wiki.geogebra.org/en/Reference:Sources_For_Used_Libr...).

- the GeoGebra installers (for various platforms including Linux, Mac OS, Windows, Android, iOS) and our web services (including GeoGebra Materials platform) are made available under our own licensing terms which have been drafted by an experienced law firm. We allow you to use the installers and web services for non-commercial purposes only provided you acknowledge GeoGebra; and

- the GeoGebra language files are made available under a Creative Commons license, which allows non-commercial use of these files.

Thus, there are really many different licenses involved in the background.”

I also noticed that one of their non-free options allows you the use of their logo. IANAL, but I don’t think the GPL automatically allows you that.

Re: Desmos 3D graphing calculator

#73

Post by jasinjames »

mhh__ wrote: post #45
tabiv wrote: post #44

This is my favorite online graphing calculator. It's been around for a while. It got me through pre-calculus.

I use it for (some) quant finance work. It's not a toy, shockingly versatile.

I recall using desmos to render solutions to constraints in my physics classes in college. My favorite was plugging in the equation for the normal modes of a driven, oscilating square sheet and watching the vibration pattern pop right onscreen.

Re: Desmos 3D graphing calculator

#75

Post by JadeNB »

WithinReason wrote: post #15

Well it passes the sin(x)sin(y)sin(z)>0.1 test Edit: also sin(x)sin(y)sin(z)+0.1sin(10x)sin(10y)sin(10z)>0.1 https://www.desmos.com/3d/85d41ad6c6

What is the nature of the test? Is this something that plotters are notoriously prone to misrendering? If so, then do they do so in any predictable way?

Re: Desmos 3D graphing calculator

#77

Post by OldGuyInTheClub »

avitzur wrote: post #74
iandanforth wrote: post #46

Thank you to whomever thought about gimbal lock when designing the rotate controls.

You're welcome

Well, dang. I remember you from the very late 1980s at Stanford. Never met you but saw you on the timesharing systems of the time. A few years later I enjoyed a talk you gave at IBM Yorktown Heights about how you sneaked into Apple to build the graphing calculator.

Re: Desmos 3D graphing calculator

#79

Post by lujingzui »

I try with this example sin(x^2+y^2)

Obliviously, this function is centrally symmetric. However, when rotating the graphic, it can be seen that the ripples on the surface are not uniform. I believe this is due to the sampling method. Take a look and see if there are any areas that can be improved.

Re: Desmos 3D graphing calculator

#80

Post by munro »

it's a fun thing to do

here's a 'hyperdimensional' plotter i built when i was 18?

http://skylab.org/~felix/hyperspace/animation.html

you can surprisingly get very far with a little JS

these days I default to plotly for most things, the wolframalpha.com when i'm really lazy. i do have a friend that has been smitten by mathematica for the past decade though

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