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# GEOMETRY

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HP PRIME
Microsoft Windows XP

Why does the application GEOMETRY draws derivative eg. The function x ^ 2 x ^ 3, sine, cosine and does not scratch the derivative functions such as tangent, logx, LNX. Draws a graph incomplete derivative of y = 1 / x. Why is it like that.

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Hi!, @Johnder:

Welcome, to Forum !.

Can you, write better, your equation and question ?.

Kind Regards !.
Have a nice day !.
Provost in HP Spanish Public Forum ... https://h30467.www3.hp.com/
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@Johnder wrote:

Why does the application GEOMETRY draws derivative eg. The function x ^ 2 x ^ 3, sine, cosine and does not scratch the derivative functions such as tangent, logx, LNX. Draws a graph incomplete derivative of y = 1 / x. Why is it like that.

Something like this?

or

or like this?

It is the nature of the beast.

First 3 functions from your list are continous but the other are discontinous. That is what makes the difference

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Good morning,

The construction of the derivative function as follows:

1. GA plotfunc(sin(x))

2. GB element(GA,1.1468871)

3. GC tangent(GA,GB)

4. GD point(abscissa(GB),slope(GC))

5. GE locus(GD,GB)

When you enter plotfunc sin (x) or cos (x) or x ^ 3 will receive drawing function derivative. But when we enter plotfunc (tan(x)) or LOG(x) or LN(x) program does not draw a function of the derivative. Why.

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Hi!, @Johnder:

See, the 3.34 paragraph, from ... http://www.hpmuseum.org/forum/thread-818.html

How construct, your needed ?. Check, the coodinates, in Plot setup.

And too, examples ... http://en.hpprime.club/articles/hp-prime-workshop-geometry-app/

Check, one example, in HP PRIME and Wolfram Alpha ...

Kind Regards !.
Have a nice day !.
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Dear Make,

Thank you very much for providing links to the topic. But this does not solve the problem.
In your example, you have entered the function y = sin (x) ^ 3. For this function, the program will draw the derivative function. But please type the function tan (x). I see that there is drawn derivative of the function. The same is true for mathematical functions, such as: 1 / tan (x), log (x) ln (x) 1 / x etc. It should be corrected.

Kind regards!

Johnder

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Hello,

Thanks for bringing this to our attention. Indeed, the issue is exclusively with the drawing of the results being returned by the "locus()" command. It is returning a vector of plotparam calls [ plotparam(...), plotparam(...)] and the back end for drawing the plots isn't handling them.

Its on the list for correction. If you go into your num view, you'll see the derivative was defintiely calculated there properly.

TW

Although I work for the HP calculator group as a head developer of the HP Prime, the views and opinions I post here are my own.
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Hi!, @Johnder:

See, the images with functions and plot's ...

Kind Regards !.
Have a nice day !.
Provost in HP Spanish Public Forum ... https://h30467.www3.hp.com/
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Dear Tim,

Thank you very much.

Kind regards!Johnder

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