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HP Forum Archive 21

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dx increment on WP 34s
Message #1 Posted by Richard Berler on 2 Apr 2013, 3:35 p.m.

I was solving for f'(x) to find extremums of functions on my WP 34s. The default increment (which was arbitrary, but set by necessity) of .1 works well in most circumstances. I did find that there was something of a sweet spot around a dx of .029 in accuracy, and ability to solve f'(x) with an asymptote nearby. At dx=.1, the solve would find the asymptote too easily and show an infinity message. If I set the dx much below .029, the solve would slow down, lose accuracy, or fail on occasion.

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