Brilliant!
I tried x Vs x^(1/x) and got a nice curve, almost parallel to the x-axis as x increases.
(1) Can't the axes have different scales?
(2) I tried x^10 Vs x and got nothing!

I think the little box which pops out when you click calculate is cool.

When I plot x^7 or x^8 or with a higher power, the whole graph turns blue, with just the x and y axis arrows sticking out in red...

I think I have ironed that particular bug out: Torture Test

(Ganesh Q2: x and y axes will have different scales if you use the mouse to draw a rectangle around your area of interest)

Ctrl-c sometimes works with flash, but the most reliable is right-click|select all, then right-click|copy

This is fun to play around with when you're bored. Nice work.

Bump.

Some people have been referring to this in Help Me topics, so I thought this topic should be revisited.

As ganesh said earlier, letting the axes have different scales would be extremely useful.
Also, in asymptotic graphs that go to -infinity from one side of a certain x-value and +infinity from the other, the grapher tries to join them with a vertical line.
I'm not sure how easy that would be to fix though.

I've been spending about 2 hours solid fiddling with this function grapher.
It is really great the way you can pan around.
I was examining what happens when you add two sine waves together with similar frequencies,
and comparing this to the 2sin(average)cos(halfDifference) formula, which I see how it
works on paper by the way with a drawing, but anyway, after about an hour with the
awesome grapher you made, I came across some instances when occasional lines
are not printed on the screen.  I made some screen prints, in case you are interested.
It is a pretty rare occurrence and when I pan around by a few pixels, then the missing
lines show up on the screen.  But overall, the grapher is beautiful and very, very nice.
Just thought I'd let you know.  I took some screen shots if you ever want to see the missing lines.

You can also find the missing lines with y=x^2,
if you zoom out so 10000 units is about one inch, and
then pan upward a few screens, then the left or right
side a the parabola might appear without the other side.
Here is a picture of some trig...
If you pan around by 2 or 3 pixels at a time by clicking
near the middle, then the lines will appear for some
clicks, and then disappear for a few clicks, and if you
pan back, it is always the same locations that trigger
this when you find the problem, so it isn't intermittant I guess.

Uploaded Images

Nice upgrades!
The 'a' slider is a bit laggy, but it works perfectly.
I'm not sure if it's new, but I also really like the polar feature.

One thing - the plots people have been posting don't seem to work anymore.

Edit: I'd also really like boxes where you can specify the shown range exactly (eg. (-pi,-1) to (pi,1) )

MIF, here are 2 function graphers.

http://www.mathsisfun.com/data/function-grapher.php
That one says "y =" to the left of the entry box.

http://www.mathsisfun.com/data/function-grapher.php
This one does not say "y=" to the left of the entry box.

Since the older one doesn't say "y=" to the left of the
expression you enter, it might be a tiny bit confusing.
Just a thought.

Sorry, my forgotten cut and paste.  Should be:
http://www.mathsisfun.com/data/graph.html
(This one has a black background, and no "y=")
(I guess there are 3+ equation graphers!)

KrazyKyngeKorny wrote:

Graphs are a big help in the understanding of math.

Yes, well said, especially in determining the number of  zeroes that a polynomial has and where they are. Other types of functions even more so! With the new graphing calculators and CAS they are fun to do also. When I started they only gave us a beach full of sand to draw on and some pebbles to count with. Some of us were eaten by sharks, math was more dangerous then.