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[Bugs]ClassPad II OS Version 02.00.0000.0000

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Calculators: Casio fx-7400GII, Casio fx-7400GII (SH4), Casio fx-9750 G II, Casio fx-9750 G II (SH4), Casio fx-9860G, Casio fx-9860 G SD, Casio fx-9860G Slim, Casio fx-9860 GII SD, Casio fx-9860 GII SD Power Graphic 2, Casio Classpad 330 plus, Casio fx-CG 20, Casio Classpad fx-cp400, Casio fx-CG 50

Re: [Bugs]ClassPad II OS Version 02.00.0000.0000

Postby SimonLothar » Sun May 28, 2017 11:04 am

The calculator uses the integration of SQRT(1/(1-X*X)) to calculate arcLen( SQRT(1-X*X)...) .
The problem seem to be the integration limits -1 and 1.
The expression 1/(1-X*X) is not defined for these values.
F. i. if you use -0.999... and 0.999... as integration limits, the calculation is at least possible.
I'll be back!

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Re: [Bugs]ClassPad II OS Version 02.00.0000.0000

Postby Wolfgang » Sun Jun 04, 2017 8:57 am

SimonLothar wrote:The calculator uses the integration of SQRT(1/(1-X*X)) to calculate arcLen( SQRT(1-X*X)...) .
The problem seem to be the integration limits -1 and 1.
The expression 1/(1-X*X) is not defined for these values.
F. i. if you use -0.999... and 0.999... as integration limits, the calculation is at least possible.


Thank you for the workaround but I wonder why ClassPad can't calculate the exact result?
I found out that when I slightly transform the result I get the correct answer:

Image

So I think it's a bug in the ClassPad CAS and it would be great to get it fixed. Do you know how to report this to Casio?

Btw. Mathematica has no problem with both expressions and yields the same result:

Image

Regards,
Wolfgang

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Re: [Bugs]ClassPad II OS Version 02.00.0000.0000

Postby SimonLothar » Sun Jun 04, 2017 2:56 pm

Yes, that is a bug indeed. They should correct it.
I'll be back!

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Re: [Bugs]ClassPad II OS Version 02.00.0000.0000

Postby TeamFX » Sun Jun 18, 2017 6:03 pm

A new OS version has been released.

Version 2.01.2000
Calculation capability improvement

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Re: [Bugs]ClassPad II OS Version 02.00.0000.0000

Postby PsySc0rpi0n » Thu Dec 28, 2017 12:53 am

Is it only me or the integrals calculation is still very poor?

For instance, if I try to evaluate (250/(2*pi)) times the integral from pi/2 up to pi of sin(2*pi*50*t) dt, it tales like 3 of 4 minutes to return a result!

However, if I use 3.14 as an approximation for 'pi', the result is returned in like 6 or 7 seconds!

PS: I have just installed the latest OS update! I have told this in previous versions and I also tried to contact portuguese supporter and also some support email from asia that I can't remember, but never seen any improvements neither got any reply from that emai!

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