why won't this graph Greetings, I confess to having, from time to time, difficulty knowing why GC won't graph some things. I've used sliders in other animated...
1581
Petri Sirkkala
petrisirkkala
Nov 28, 2008 9:37 pm
Hi, The y = ... line probably should read y(x) = ... I don't see w (the one on the first eq. line) used anywhere. I removed it. Also the y(x) = g(x) will not...
1582
Kevin Farrell
kjf103057
Nov 29, 2008 3:05 pm
Chris young should be able to figure this out!...
1583
Christopher O. Young
c1572young
Nov 30, 2008 6:33 pm
... The problem seems to have been just with the "w"; GC 3.5 won't accept using reserved letters (t, u, v, w, i, r, etc.). The "w" is used in complex 4D...
1584
Christopher O. Young
c1572young
Dec 4, 2008 8:45 am
The following are the special symbols that GC 3.5 uses. These can't be used as variables.
You can find them by searching for "reserved"; in the Help.
I've...
1585
David Craig
dcraigx
Dec 11, 2008 6:56 am
... GC is quirky, to be sure. I do hope this gets cleaned up as time goes on. The LONG list of reserved names is one of my pet peeves. I really, REALLY...
1586
dgorbachev
Jan 19, 2009 6:39 am
I'm just wondering is there any way to specify initial conditions for an ordinary differential equation, for instance dy/dx = ky, y(0) = 2...
1587
Chris Young
c1572young
Jan 19, 2009 5:22 pm
... No initial conditions can be specified explicitly with GC 3.5, however you can move the cross-hair in such a way as to see the curve matching any given...
1588
Kevin Farrell
kjf103057
Jan 20, 2009 11:43 am
You can use the color box to get just one curve Makes this much easier Move curve to the point Just watch coordinates...no need to plot lines ... Re:...
1589
Chris Young
c1572young
Jan 21, 2009 10:12 am
Eventually maybe this could lead to ways of visualizing different numerical integration methods for ODEs. One thing we notice is that the solution curves...
1590
Chris Young
c1572young
Jan 22, 2009 12:01 pm
Hoping to get some visual insight into how each function curve is threaded through the slope field by numerical solution procedures, e.g. Runge-Kutta method. ...
1591
Chris Young
c1572young
Jan 22, 2009 12:36 pm
As long as we've got an integrable function of x on the right hand side, we can integrate.  The integrator at http://integrals.wolfram.com/index.jsp works, ...
1592
Chris Young
c1572young
Jan 22, 2009 12:56 pm
The slider can be used to vary the k coefficient.   The slider can be used to vary the k  coefficient....
1593
Chris Young
c1572young
Jan 22, 2009 1:00 pm
Sorry, I wasn't showing all the slope segments due to a typo in one of the equations.   Sorry, I wasn't showing all the slope segments due to a typo in...
1594
Chris Young
c1572young
Jan 24, 2009 9:30 pm
For some reason I couldn't take the derivative of the unit tangent the way I wanted to, so the tubes may get a little distorted in places. However, you can...
1595
Chris Young
c1572young
Jan 24, 2009 9:42 pm
Here's why the spiral gets kinky. The way the drawing is done is to twist each segment between the "hoops". So the tube will be narrower in the middle.  ...
1596
Chris Young
c1572young
Jan 24, 2009 10:06 pm
Just derives from rule of exponents. I guess the apparent lack of symmetry between the general exponential, and the general logarithm is due to the Chain Rule...
1597
Chris Young
c1572young
Jan 24, 2009 10:28 pm
The function for the unit tangent is working OK, but GC doesn't like the exression for the unit normal I have, although it's correct mathematically.   ...
1598
Chris Young
c1572young
Jan 24, 2009 11:00 pm
The monkey is seated in the Frenet–Serret frame http:// en.wikipedia.org/wiki/Frenet_formulas   The monkey is seated in the Frenet–Serret frame ...
1599
Chris Young
c1572young
Jan 24, 2009 11:00 pm
Here, the tubes get distorted: I think I've fixed it below, by just normalizing the binormal....
1600
Chris Young
c1572young
Jan 24, 2009 11:03 pm
Got the monkey seated upright by reversing one sign:   Got the monkey seated upright by reversing one sign:...
1601
Chris Young
c1572young
Jan 24, 2009 11:16 pm
 ...
1602
Chris Young
c1572young
Jan 25, 2009 10:28 am
An attempt to contrast a curve with no torsion (the plane sine curve), with a twisting one (the wobbly sine curve). The chick on the easy roller coaster stays...
1603
Chris Young
c1572young
Jan 25, 2009 10:33 am
An attempt to contrast a curve with no torsion (the plane sine curve), with a twisting one (the wobbly sine curve). The chick on the easy roller coaster stays...
1604
johnalbers2003
Feb 18, 2009 9:25 pm
Looking through the demos, I see some things that as far as I know are not documented or hardly mentioned in any of my reading about graphing calculator. Is...
1605
Chris Young
c1572young
Feb 19, 2009 6:44 am
... It's actually the points "a" and "b", represented by complex numbers, that are being dragged around.   You can have any points draggable by assigning...
1606
Chris Young
c1572young
Feb 19, 2009 6:45 am
On Feb 18, 2009, at 3:08 PM, johnalbers2003 wrote:
> Looking through the demos, I see some things that as far as I know are
> not documented or hardly...
1607
Chris Young
c1572young
Feb 19, 2009 7:20 am
Graphing variables, such as t (for parametric lines) and u and v (for parametric surfaces) are sort of like paint brushes which are applied to the vectors you...
1608
johnalbers2003
Feb 23, 2009 9:28 pm
I am looking at examples/two dimensions/tangent line to a function and would like to know how they entered the notation for the derivative of f(x) vertical bar...
1609
Chris Young
c1572young
Feb 24, 2009 12:38 am
... I lost the original example, but here's an attempt to do a version where the length of the arrow is equal to the value of the derivative.  To get the...
