For example, I would like to create my own material (that is, start to write textbook material) for precalculus. I have to be able to generate, for example,...
... People [:-)] Seriously. This may have changed, but at least up until not very long ago all that stuff was done by professional draughtsmen. David Craig ...
Hello, This email message is a notification to let you know that a file has been uploaded to the Files area of the GraphingCalcUsers group. File :...
GraphingCalcUsers@yah...
Dec 4, 2007 6:40 am
1510
Hello, This email message is a notification to let you know that a file has been uploaded to the Files area of the GraphingCalcUsers group. File :...
GraphingCalcUsers@yah...
Dec 4, 2007 6:42 am
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Someone was asking about this recently. If you have any comfort with LaTeX, a quite brilliant combination is GC + LaTeXiT. You can generate whatever you want...
If there's a problem graphing an implicit function, it can usually be solved by putting the constant on the left hand side and subtracting a numeral, such as...
Hi Christopher, The font you are using seems to be missing from me. What should I do to read your formulas? -Pete ... -- Petri Sirkkala, sirpete(ät)iki.fi,...
... Of course we can't neglect the traditional algebraic way and must deal with the "Fundamental Forms". But Hilbert in his classic "Geometry and the ...
... Sorry if I got a bit vituperative, there. Result of years of frustration with inadequate illustrations of interesting ideas. The fault isn't really with...
... Here's a way to color the background and then put the contours on top of it.   To increase the number of contours, drag the resolution slider (at the...
Chris- ... Right. This is the two-dimensional generalization of the fact that the radius of curvature of a plane curve at a point is the reciprocal of the...
Absolutely right about the necessity to _also_ check our intuitions via equations and symbolic logic. I would call it "two-track math". I have to wonder if the...
... I am reminded that when using a slide rule one had to have direct intuition about the magnitudes of reasonable results which, for better or worse, one no...
dan@...
Dec 27, 2007 2:34 am
1521
... Categorically for the worse, I venture. (This from one whose father had a slide rule -- by which I was fascinated -- but the world was long past them...
Hello all! Happy New Year to all of you! I was wondering, on this last day of 2007 (!), if there is a course, podcast, series etc. in Graphing Calculator about...
Jorge, Thanks, and a happy new year back to you! Re your e-mail--- ... This isn't something I know much about, but glancing at the article in Wikipedia on...
I think this is one correct way to visualize the DFT.   Above, on the right, the values are complex numbers: the hue (red to purple) shows the modulus,...
Here, to be consistent, I've plotted the original real-valued function the same way as the complex DFT: red is for positive sign ("argument" of 0) and the hue...
Here's the standard way for visualizing complex functions, with higher modulus in brighter colors, and the argument shown by hues going from red for 0 degrees...
Just trying to get some more insight into how the DFT is behaving by playing around with various simple starting functions. Here I'm trying the contour map of...
Hi Jorge, Signal processing is usually done with numerical evaluation for example with GNU-Octave [1] or Matlab [2]. But naturally these programs and their...
Chris's efforts on the DFT and Jorge's query show how far this topic has come since I first looked into it - about 1970 after a psychology professor studying...
Thanks, George. Can't take any credit for the equations, but at least I think I showed that GC 3.5 can help quite a bit with visualization. Right now, it's...
Chris! (and others) Many Thanks for this nice surprise when I opened the e-mail. As always, what a knowledgeable and helpful person you are! I will have a...
Jorge, Glad to help. I've always wondered how Photoshop and other similar programs manage to sharpen up an out-of-focus image. It seems like magic. If I have...
When sampling you should also remember the Nyquist rule for sampling frequency. Although I guess in this case you are resampling an already sampled image and...
Pete, Thanks very much for the advice, which I'll keep in mind. I'm not sure exactly how to determine the frequencies involved in the simple graphs I'm using;...
