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Archived This topic has been archived. Information and links in this thread may no longer be available or relevant. If you have a question create a new topic by clicking here and select the appropriate board.
HP Recommended
HP Prime

I'm not able to solve these functions in HP Prime. Some help would be very welcome 

 

 

fsolve.PNG

4 REPLIES 4
HP Recommended

fsolve does not work well in this case, but when you use solve instead of fsolve it works.

 

In this case the Solve app is even better than fsolve when you do a reasonable guess, but in one-variable problems fsolve is usually better than the Solve app.

HP Recommended

If you are doing calculationg in the CAS, not using decimals generally not give you the best results. You can very easily convert your decimals (even those embedded inside an equation) by tapping on the item in the history, and pressing [ a b/c ].

 

fsolve will not give good results in this case because your values are so incredibly tiny that it will take a very, very long time to converge using numerical algorithms.

 

 

Also, there is no reason to be using "fsolve" on these problems. fsolve is to use specific numerical algorithms and in this case you really want to be solving symbolically.

 

solve([(83333308/9999997) = (sqrt(l/r)),(7*10^7) = 1/(sqrt(l*r))],[l,r]) imediately pops out your correct numerical values.

solve([8.3333333 = (√(l/r)),(7*10^7) = 1/√(l*r)],[l,r]) both immediately return your result.

 

 

Not sure what the problem you are reporting is....???

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.
HP Recommended

The Advanced Graphing app can solve the problem numerically.

 

For this purpose choose from the menu in Plot view: Trace – PoI – Intersections with V2.

 

Already with Zoom – Decimal we get a good approximation, and when we zoom in further by repeatedly pressing the + key, we get a very accurate result.

 

When we next enter X or Y in Home view the results are even accurate in the highest decimal.

2017-04-08 16.15.32.jpg

 

 

2017-04-08 16.22.27.jpg

HP Recommended

Hi!, Jan_D:

 

If you comparise, with Alpha Wolfram, the result, is same ...

 

IMG_20170412_192345.jpg

 

Kind Regards !.
Have a nice day !.
@Maké (Technical Advisor Premium - HP Program Top Contributor).
Provost in HP Spanish Public Forum ... https://h30467.www3.hp.com/
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