You just have to set the way you receive e-mails from the Yahoo group to individual e-mails. If the graphics are in e-mails I sent, I can forward them to you....
I have been playing with Hypotrochoids and Epitrochoids, and wanted to share the results with everyone. Hypocycloids are the curves traced by a single point on...
Matthew, I believe that this group has attachment saving turned off. You have to have the messages mailed to you (I think it has to be individual mail, not ...
I use GC to draw graphs to use on assignments, quizzes, and tests. Some times I would like the graphs to be thicker for more of a contrast when photocopying....
Rodney, Here is a trick that MAY or MAY NOT be useful... I use Shift-PrtScn on the keyboard to capture the image, use Microsoft Paint to paste and crop the...
Just to clarify, this file shows the simultaneous graphs of the epitrochoid---the gray circle rolling outside the blue circle---and the hypotrochoid---the gray...
I'm trying to find an efficient way to get the angle of points that get dragged around. For some reason, GC returns a non-zero imaginary value for what seem to...
Trying to find ways of visualizing all of the parameters involved in equations for epitrochoids. Here, the angles traversed are indicated by "lighting up" the...
Chris, I think this is a bug, or at least complex number arithmetic round off error. Try Re(acos(Px/|P|)) and Re(asin(Px/|P|)) to get rid of the small...
I think I've got the angle shown for the turning of the small circle to big here. Shouldn't it just be in inverse proportion to the radii? I used the formula...
Here the red dots are the vector sums of the respective blue and green dots. The "1" in the term is due to the rotation of the small circle just be virtue of ...
Work in progress towards illustrating the invariants associated with a line-bound vector, according to Felix Klein's "Advanced Math from an Elementary...
Setting L_x and L_y, the length of the projections and N, the area of the parallelogram determined by the vector's end points and the origin, determines a...
Haven't worked out the implications of this yet, but here's an example of how you can animate various parameters to see what they do. I plan to add the...
Here I've simplified everything, taking out subscripts, etc. from variable and function names. I still get the "Can't parse condition after the comma" when I...
Here I've isolated the problem equations. Still the same problem with parsing. Also, for some reason all the variables get listed on the right as if I haven't...
Here I've isolated the problem equations. Still the same problem with parsing. Also, for some reason all the variables get listed on the right as if I haven't...
If I don't divide by the absolute value, the triangle-interiior function works, at least in one case: The more complicated expression for "W" still doesn't...
This version just uses a region based on a simple inequality involving lines around the origin. Then the region is rotated by substituting in rotated and...
I think the following, if interpreted correctly, returns all the possible information about the position of a point with respect to a triangle. Seems that a...
It's painfully slow on my early-model iMac, but at least this shows I'm on the right track with the point-in-triangle coding function. Here, all the equal-area...
Simplified the coloring routines. My previous example was needlessly complicated. Still painfully slow on my iMac, unfortunately. But good for making...
Here, I've just used the unit normal vector to thicken the border of the main triangle to distinguish it from the sub-triangles (thinner, colored borders). ...
I'm not exactly sure why this is working, but I've finally got overlapping stripes to show how the positive area (in this case, the yellow triangle outside...
