aantthony / graph.tk Goto Github PK

Hello!

I don't mind the .htaccess in there, but it'd be much better if it only had options for graph.tk (the app not the domain!) and not general site-wide options like icons and error pages.

It would be useful if points could be plotted. I guess this is pretty straightforward.

After deleting a function in the middle, functions below it cannot be edited. This should be an easy one to fix, but I wrote it here so I don't forget.

If you plot a graph, say (x+3)/(x-2) you have an undefined value at -2. This should not be drawn, however, we get a vertical line: http://www.gute-mathe-fragen.de/?qa=blob&qa_blobid=18172464407364120737

Another example, even worse: x+tan(x)
http://www.gute-mathe-fragen.de/?qa=blob&qa_blobid=8602167692544029133

This an important issue as users might think there is some value defined.

How can we solve that?

PS: I am ready to donate some money if that could be solved. As I said, that is a very important issue.

For example if you wanted to look at the particle projection of something in 3D.
It will be viewed in 3D too. Check these out: http://url3.tk/exp.png and http://url3.tk/stereo/
This would require adding support for functions returning vectors, or maybe more easily parametric equations of time.

Would this be a waste of time? Any ideas anyone?

How should it be done? What buttons, mouse movements,...

• Hold Command/Control to draw a rectangle that will be the new viewport?
• Auto Zoom? Probably a bad idea.

Config:

• Text size
• Whether to show text for yc, xc, maxima & minima, inflection points etc.
• Future: Load plugins/modules. (for the CAS)

What else?

Sometimes scrolling in and out of functions can be a little bit confusing as it scrolls in very fast.

Buffer an image which is larger than the current screen size. That way when someone moves the graph, there is a picture to display. (This might slow it down a bit...)

Finally, this might be worth a look over: http://pagespeed.googlelabs.com for slow connections, compression would REALLY help loading time.

Facebook has been saying that the domain graph.tk has been reported as abusive by its users, which means people can't use the "Like" button, or post anything containing links to http://graph.tk/, and our Facebook page is locked to being blank (I'm guessing because it detects "graph.tk" being the title.)

Either we have to use a new domain (any ideas?) or someone will have to convince the scum at Facebook to unblock it.

http://www.facebook.com/l.php?u=http%3A%2F%2Fgraph.tk%2F

By the way, regarding Facebook, today is defriend today: http://www.huffingtonpost.com/2011/03/04/defriend-day-etiquette-wh_n_831726.html

It would be more useful if instead of displaying the mouse coordinates, it locked/snapped to points on the graph, so that you could get values off the plot.

Could be part of the GUI interface or via the command line input.

I tried looking through the source to see if this was already implemented/what the command was and I could not find it.

When using the inverse (square root) we get a plus or minus. Should we use a ± operator, or build in support for arrays that would work like this?:

1+[2,3]+[3,4] = [3,4]+[3,4]=[6,8]

±x=[x,-x]

(the first value is the primary value which will be used if a function is required, like the .f for a graph object.)

Enter \theta=r, zoom out a bit and it's a complete mess.

I do not know why. It should be undefined.

I tried to plot max(x, 2) but it draws nothing.
But min(x, 2) works fine.

By the way, thank you for providing such a convenient tool!

It thinks x is meant to be a function.

sinh cosh cosech sech

Also, sinc

Currently it zooms into the origin.

Example, typing print, results in print. No idea why.

[1,2,3] doesn't simplify properly since it can be eval'ed to eval("1,2,3") = 3.

It should work like:
sin([1,2,3])+[1,2,3] = [sin(1) sin(2) sin(3)] +[1,2,3]=[sin(1)+1....]

Seems this loop has some problems to remove all the graphs:

for(var i=0;i<graphs.length;i++){
    app.ui.colors.free.push(graphs[i].color);
    graphs.splice(i,1);
}

This change works fine:

for (n in graphs){
    app.ui.colors.free.push(graphs[n].color);
}

graphs = {};

P.S.: change above fails, this one seems good though

for(n=0;n<graphs.length;n++){
    app.ui.colors.free.push(graphs[n].color);
}
graphs = [];

When graphing:

\frac{d}{dx}ln\left(\right)

There is an error:

undefined: {"stack":"TypeError: Cannot read property 'type' of undefined
    at compile (http://url3.tk/graph.tk/min/be61b5d.js:6228:10)
    at HTMLElement.<anonymous> (http://url3.tk/graph.tk/min/be61b5d.js:5724:31)
    at HTMLElement.<anonymous> (http://url3.tk/graph.tk/min/be61b5d.js:17:1034)
    at HTMLElement.<anonymous> (http://url3.tk/graph.tk/min/be61b5d.js:16:30197)","arguments":["type",null],"type":"non_object_property_load","message":"Cannot read property 'type' of undefined"}

seems piecewise function is not supported yet , have a plan ?

I should probably put it back there?

ζ(x)
\zeta(x)
The function is not in graph.tk.

http://url2.tk/6U

M: Hassium it got 269 (wikipedia says so) not 277 as atomic weight ;).

Theres no way to type a cube root, and (-8)^(1/3) won't work.

The function needs to be brought back.

Creating sums, was possible in the old graph.tk (now at http://graph.tk/?old)

It zooms too much

Chrome Web Store page needs to be updated to a newer version, so that browsers don't cache the old version on http://graph.tk/

I will fix this tonight, this is just a reminder for myself really.

Causes a crash. Not sure why.
\frac{d}{dx}(\frac{1}{x^x})

BTW, How can I write the shift+6 character?

It tries to access /langs/en-gb.js for me. It would maybe be nicer if all languages were stored in one javascript file. That would also allow it to be cached via the html5 cache manifest.

Or will Times New Roman do?

The new version's curves are a little awkward. The old ones were much smoother.

There should never be equations on two lines, unless it hits a maximum width.

Buttons don't display the correct background position in Opera. This is probably because of the input[blah=x] stuff

Maybe (x,y) = (3t, -t), t \in R?

Currently graph.tk only supports modern browsers that natively implement <canvas>. There's a clever Internet Explorer script that uses VML to simulate <canvas> called Explorer Canvas that's pretty legit: http://code.google.com/p/explorercanvas/

Seems worth a try.

I can do it for the iPhone, but someone else will have to test it on and Android phone since I can only use the simulator.

Areas should be shown when functions like y>x+1 are plotted.

The old version is pretty bad. Anything that needs to be done before release? Otherwise I think I should change it ASAP.