What is Digg?31 Comments
- RBotros, on 10/12/2007, -0/+29Try: sqrt(4-(2-abs(x))^2); - sqrt(16 - 4 * abs(x))
- the_atomic_ned, on 10/12/2007, -0/+22sqrt(9-x^2);
-sqrt(9-x^2);
1/3*sqrt(9-9*(x+1)^2)+1;
1/3*-sqrt(9-9*(x+1)^2)+1;
1/3*sqrt(9-9*(x-1)^2)+1;
1/3*-sqrt(9-9*(x-1)^2)+1;
1/2*-sqrt(9-4*x^2)-.5; - RyeBrye, on 10/12/2007, -0/+7- It also has something to "Create Fourier Series" whatever that means.
A Fourier series represents a function with a lot of sine and consine functions of varying periods and amplitudes. With an infinite number of sine and cosine waves, ANY function can be represented. Of course - with less than an infinite number of sine and cosine waves - the approximation may be slightly off.
You can expand things with any complete set of orthogonal functions. Bessel Functions can be used in a similar way to sines and cosines to expand things.
You can also expand things with complex numbers - and have a sum of complex exponentials. - inactive, on 10/12/2007, -0/+4Actually, that could not be farther from the truth (@ parent). The Ti-83/Ti-83 Plus frankly sucks. It lacks any form of built in CAS, the ability to do inverse trig functions without an additional program, has an uber-crappy programming language, a terrible screen, and a ton of other stuff that would take me an hour to list. It also has virtually nil calculus support. Go do yourself a favor and pick up a Ti-89 Titanium, a Voyage, or a nice HP.
- RyeBrye, on 10/12/2007, -0/+4It's not a bad graphing package for basic functions - but it has none of the "special functions" predefined.
(No Legendre polynomials, no Bessel functions of any kind [i.e. J's, Henkel, Neumann, etc]... No Dirac delta function, no Heaviside function, and no way to define piecewise functions)
In short - it wont replace Mathematica, Maple, or Mathcad - but it's good for a quick graph or two. - pinetree, on 10/12/2007, -0/+4> No Dirac delta function, no Heaviside function, and no way to define piecewise functions)
You can use (1 sgn(x))/2 as a Heaviside function. Once you have that, you can define your piecewise functions by multiplying them by appropriate combinations of Heaviside functions. Dirac delta functions are nifty inside of an integral, but I don't know what you would hope to see by graphing one. You are right about it missing the other functions though. - ThomasPalmer, on 10/12/2007, -0/+4If you need a couple (or more) of good reasons to click on the link above.
- You can graph up to five functions each automatically shown in a different color.
- You can set the x min and x max as well as the y min and y max.
- You can move your mouse over the graph to see x and y coordinates.
- It seems to work very fast.
- You can even download it.
- It has the list of functions that you can type in.
- It also has something to "Create Fourier Series" whatever that means. - phlyngpngn, on 10/12/2007, -0/+4The best part of this, by far, is that the whole thing is written in JavaScript. Have a look at the source, it's somewhat interesting. However, the point is that you can actually save that page and run it offline just fine because there's nothing too fancy about the whole thing. His windows app seems to be completely disconnected from this because of that.
- v3xt0r, on 10/12/2007, -0/+3I kind of like his drag/drop&resize scripts:
http://www.walterzorn.com/dragdrop/dragdrop_e.htm - pinetree, on 10/12/2007, -0/+3That should be (1 + sgn(x))/2. It seems that Digg eats "+" if you edit your post.
- Dennern, on 10/12/2007, -2/+5TI-89 Titanium, need i say more?
- AutoXer, on 10/12/2007, -2/+5HP 48GX... Reverse Polish Notation... I love it
- pornel, on 10/12/2007, -0/+3OS X Tiger has "Grapher" app that does the same thing (plus plots in 3d). Math can look cool :)
- walugi, on 10/12/2007, -0/+2Good find, useful for those niggly little graphs. Thanks
- ZekeSulastin, on 10/12/2007, -0/+2I think 3d graphs, complete function support, and far easier modification pwn the crap out of the web applet - and besides, you can do a large amount of other math with a TI-89 :P
- schildkroeter, on 10/12/2007, -1/+3If you have a Mac with the new OS, you get a tool called Grapher... but for all Win and Linux users this might be useful!
- ThomasPalmer, on 10/12/2007, -2/+4IDK... I think color, bigger screen, more accurate tracing, and faster rendering speed owns the TI-89 Titanium
- Dennern, on 10/12/2007, -0/+1This is cool, but the best program in the world in Graph which can be found here: http://padowan.dk/graph/ this program is just damn awsome, and it's free
- jewster, on 10/12/2007, -2/+3ti83....please.
you cant top the hp 48gx - Gesiwuj, on 08/26/2008, -0/+1try ({ cos({θ-r}) -sinθ}) ({r^{4}-2r^{2} cos({2θ + 2.4}) + 0.9}) + ({0.62r})^{1000}
- adamlazz, on 10/12/2007, -0/+1God!!!! I HATE standard form!
- inactive, on 10/12/2007, -1/+1http://gcalc.net/
- basjanssen, on 10/12/2007, -2/+2I just finished a course in MatLab and I must say... it takes some time to learn but its really the best out there it has support for OOP, can work with images movies, sound, integrates with windows applications, and so on...
- lsandberg, on 10/12/2007, -0/+0@pornel
I'd hate to burst your fan-boy bubble, but I am forced sometimes to use grapher in a production setting and its frankly terrible. the only way in which anything it produces is useful for anything other that plotting equations faster than a TI-83, is if you fix the graphs up in photoshop first, (which adds way to much time to production). - MentosMan, on 10/12/2007, -0/+0Just in time for my Honors Alg 2 year to be over. Typing functions into a graphing calculator on the small pad becomes incredibly tedious
- magestic, on 10/12/2007, -0/+0Don't work correct here, but try sin(5x)cos(4x) in polar form on a calc.
- olegk, on 10/12/2007, -3/+2Matlab is so much better
- mikegioia, on 10/12/2007, -5/+2sorry to say but Windows powertoy calculator owns this thing.
- CharlesDarwin, on 10/12/2007, -4/+1"Of course, you have to know what the functions are and how to use them if you want it to work. Charting 1+1 isn't that much fun."
I love TFS. Diggers are ***** retarded! - RBotros, on 10/12/2007, -4/+1I googled a little and found a more powerful ajax-based one with loads of other features: http://digg.com/software/Very_Powerful_AJAX_Calculator_with_Plotting
- grungyhamster, on 10/12/2007, -8/+0OLD'D.
The stumble upon brings these up all the time. And besides, nothing beats the trusty old TI-83 Plus.
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