HP Forum Archive 19

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Casio Prizm screenshot Message #1 Posted by Don Shepherd on 18 Dec 2010, 10:27 p.m. Here is a screenshot from the Casio Prizm, showing the graph of two inequalities, y>=x+1 and y<2x+3. The dark shaded area is the solution to both inequalities. The actual screen looks somewhat crisper than the screenshot.

Re: Casio Prizm screenshot Message #2 Posted by Thomas Klemm on 19 Dec 2010, 2:33 p.m., in response to message #1 by Don Shepherd What an improvement compared to what we can do with an HP-48G: Since I'm not that familiar with plotting I had to consult the manual. You need two different plot-types: TRUTH and CONS. As suggested in the manual I created two variables: INEQ 'Y\>=X+1 AND Y<2*X+3' EQNS { 'Y=X+1' 'Y=2*X+3' } Now you can choose one or the other for EQ. Don't ERASE the graph after drawing the first plot. Currently I'm reading the fun of programming. There's a chapter dealing with images (7 Functional images). So I wondered whether I could do that with my HP-48 as well. Here we go: Checker checker \<< FLOOR SWAP FLOOR + 2 MOD NOT \>> EQ \<< Y X checker \>> Polar Checker Make sure you have your calculator in RAD-mode. toPolar \<< R\->C DUP ABS SWAP ARG \>> n = 10 EQ \<< Y X toPolar \pi / n * checker \>> Swirl Vertical Strip vstrip \<< ABS .5 \<= \>> fromPolar \<< \-> r \Gh \<< \Gh SIN r * \Gh COS r * \>> \>> r = 1 EQ \<< Y X toPolar OVER 2 * \pi * r / + fromPolar vstrip \>> Now this turns out to be very slow. Moreover I received an "Insufficent Memory" error and had to plot the image in several runs. Not exactly what you want. Still I hope these examples might be inspiring. Best regards Thomas

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