HP35s and numerical differentiation

10052014, 11:47 AM
Post: #2




RE: HP35s and numerical differentiation
(10052014 10:58 AM)mcjtom Wrote: What would be the simplest way of estimating a slope of tangent to function/expression (say, already stored in equation library) for a specified variable at a specified point? There are several ways of evaluating the derivative of a function, a quite elegant one is shown below. Quote:I imagine I could write a programme that would use, say, twopoint secant formula (or some higher precision formulas), but how would I parse a function from an equation library to it? Is there a simpler way? There is no way to access the equation list from within a user program. Sorry. However, if the original function is defined in user code, another program may determine the derivative. A quite elegant way uses the 35s' complex mode. This has been discussed earlier in the old forum. A discussion with a working example in a 35s program can be found in this thread. Label F defines the function, label D calculates the derivative. When entering the function F, be sure to use only commands the 35s can handle in complex mode, e.g. use x^ 0.5 instead of sqrt(x). Dieter 

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Messages In This Thread 
HP35s and numerical differentiation  mcjtom  10052014, 10:58 AM
RE: HP35s and numerical differentiation  Dieter  10052014 11:47 AM
RE: HP35s and numerical differentiation  Eddie W. Shore  10052014, 04:43 PM
RE: HP35s and numerical differentiation  Thomas Klemm  10052014, 09:39 PM

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