Graphing Calc Plotting Speed Benchmarks  Printable Version + HP Forums (https://archived.hpcalc.org/museumforum) + Forum: HP Museum Forums (https://archived.hpcalc.org/museumforum/forum1.html) + Forum: Old HP Forum Archives (https://archived.hpcalc.org/museumforum/forum2.html) + Thread: Graphing Calc Plotting Speed Benchmarks (/thread107694.html) 
Graphing Calc Plotting Speed Benchmarks  Warren Anderson  02082007 Because I'm lazy and can ask experts instead of trying myself... I recently obtained a 48G+ because it seemed to be the ultimate product of old HP, subject of Wicke's books, RPN/RPL, build quality, etc. I was astonished at how long it took to plot the "Woodyard/Kahan integral" over the default interval. Seemed like more than a minute. Then an equally long wait after I changed the interval. Granted, I spent only a few minutes with it, but found the calculator unusable for interactive function analysis based on the output delay. I did a full clear first. Were there some flags I didn't set but should have that would have sped it up? I have several excellent graphing/CAS programs on a bigscreen Mac, but thought it would be cool to mess around on the small screen too using vintage tools. The 48G+ is no longer with me, but a 50g is not out of reach, and I'm lucky to own an Xpander which I never use because the battery insertion is a major pain and screen contrast atrocious. Are there any plotting/graphing/function analysis benchmarks comparing 48G to 50G to Xpander? Imagine the performance has improved markedly with new processors.
Re: Graphing Calc Plotting Speed Benchmarks  Dia C. Tran  02082007 If you are into plotting then either the new calculator or better yet a software package running on your PC. The 48's are great calculator but the screen resolution is too low for good plotting.
Re: Graphing Calc Plotting Speed Benchmarks  Chuck  02092007 Possible improvement in the 50g. So far I've been impressed in the speed over my old 48SX. However..... I ran into an odd problem with having the 50g find the extremum of a function today. We were solving the classic problem of optimizing the viewing angle in a theatre where the seats are on a slant. To make the equation more manageable I used two variables for subequations, and then graphed the main equation...
as = (x Sin(25)  6)^2 + (x Cos(25) + 7)^2 Graphing eq produced the correct graph, but the extr command gave values wherever the initial placement of the cursor was; not anywhere near the maximum. However, evaluating eq and regraphing the "expanded" function, the extr command gave the correct optimum x = 9.295. I hate to say it, but my students TI84's did this just fine using Y1, Y2 and Y3, and found the maximum in about 1/5th the time. :(
CHUCK
