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mathit
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HP Prime

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HP Prime

In CAS mode when I enter e^x * e^x I get the answer e^x^2 rather than e^2x as it should be.

 

Is this a known bug?

 

My software version is 2014 3 31 (6030)

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Maké
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Hi!, @mathit:

 

Welcome, to Forum !.

 

If you needed actualize, the firmware, to version 10077, you can, from ... ftp://ftp.hp.com/pub/calculators/Prime/

Needed, uninstall your actual version and copy and install, the firmware, the Connectivity Kit and Emulator

 

For your example, configure, with CAS Mode, comparise too, with MathLab ... is same, what the result, of Wolfram Alpha. Is only, other form of presentation.

 

IMG_20160424_124204.jpg

 

IMG_20160424_133340.jpg

 

IMG_20160424_133254.jpg

 

IMG_20160424_131305.jpg

 

IMG_20160424_131210.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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mathit
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Hi, thank you for your rapid response.

 

I did not realise that you could insert a screen image when I posted my first question, which I think lead to confusion as the text editor does not support superscript. In the image below the bug (error) is clear and unmistakable. In CAS mode e to the power x multiplied by e to the power x gives e superscript x superscript 2. This is incorrect. the correct answer is e superscript 2x. When the calculation is repeated with a rather than e you get the right answer in a somewhat idiosyncratic manner. You could say this is a trivial problem but it is not. See the final problem. differentiate (e^x)*(COS(e^x)). The correct answer is: (e^x)*(COS(e^x)) - (e^2x)*(SIN(e^x)).

 

 

HP_bug.png

 

Your response was that the answer is (e^x)^2 which is correct but the answer given was e superscript x superscript 2 which is e^(x^2) and wrong.

 

The reasion I am reporting this is that I consider this to be a serious bug. I expect it to be fixed and a new release of code issued. Until this happens my HP Prime is only useful as a paperweight. If this is not the correct forum to report bugs, please advise how I should do this.

 

Many thanks for your help,

M1

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BartdB
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@mathit wrote:

 

My software version is 2014 3 31 (6030)


 

This is an old version of software, the latest version is 2016 4 14  ( 10077 )

 

see:

http://www.hpmuseum.org/forum/thread-6085.html

 

-Bart
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Tim_Wessman
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Specifically, that is already 2 versions out of date before the latest was posted. Install the connectivity kit and it will automatically check for updates for you.

 

I think this issue was fixed the version right after the one you have installed. If I recall correctly, the result is actually "correct", but the 2D display doesn't show the ( ) around the inner part of the result and hence makes it look incorrect. If you continue on using it though in subsequent calculations, it is evident that the non-2d display stuff actually does have that parenthesis. I may be remembering wrong however.

 

Granted, that is still a serious issue and hence was fixed, but luckily it wasn't as bad as a completely wrong result there.

 

 

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.
Maké
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Hi!, @mathit:

 

The result (e^x)^2 is same, what e^2x, in Exact Mode (See Wolfram Alpha for comparise).

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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mathit
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Hi BartdB,

 

Thank you for your help. I had thought that I had the latest OS, Good to know I don't.

 

Problem is, when I connect the HP Prime to my PC via the connectivity kit and check for updates it was telling me that no new updates are available. I just tried it again now and I get an error "could not connect to ftp.hp.com" Perhaps the server is down. I will try again later. Is there any other way I can get the update?

 

Many thanks,

M1

 

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Maké
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Hi!, @mathit:

 

You only acceded to new Firmware across, the Connectivity kit.

 

Remember, install, Firmware, Connectivity kit and Virtual calculator, only the ultimate version (10077) ... http://h30434.www3.hp.com/t5/Calculators/HP-PRIME-GRAPHING-CALCULATOR-New-Firmware/td-p/5593925

 

Note: Is a good practice, uninstall all, old version first.

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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Fortin
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You could try here:

 http://ftp.hp.com/pub/calculators/Prime/HP_Prime_Connectivity_Kit_20160414.exe

http://ftp.hp.com/pub/calculators/Prime/HP_Prime_Virtual_Calculator_2016_04_14.exe

 

(I can get to the HP ftp site... maybe the ftp protocol is being blocked somewhere on your end?)

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mathit
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Managed to get the update. Now shows 206 04 (10077)

 

This has fixed the problem with e^x times e*x.

 

Many thanks to everyone for your help.

 

Best wishes,

M1

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