Locus disappeares in Geogebra-Tube

Werner Knobloch shared this problem 5 years ago
Answered

Hi,


Please have a look at the pictures.


The file in GGB-Tube can be seen here.


https://www.geogebra.org/ma...


thanks Werner


f631fa9ce1262d44ab2edd27ba26e354

https://ggbm.at/1576393

Comments (6)

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Werner,


I'm not sure but there seems to be a problem with 5.0.137. Your file doesn't work in the offline version of this either. However, 5.0.132 works fine. I think there is a problem with CAS loading, anything I enter gives a "Sorry" message.


Simon

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Hi Simon,


I'm working offline with Geogebra 5.0.137.0-3D and for me it works well.

The problem is that Geogebra-Tube doesn't show any Locus line.

I believe that there's a problem with "Φ_a = Integral[φ_{(μ,σ)}, -∞, x(A)]" in Geogebra-Tube.


Werner

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That's very odd.


As I said for me 5.0.137 has the Integral undefined, hence no locus, both offline and online. Exactly the same as shown in your screenshot. Even a new window offline does not allow me to use CAS, "Sorry, something went wrong...".


However, just downloaded and tried the portable version of 5.0.137. Works OK.


Now even more confused, and no further in answering your problem.


Simon

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We'll check, but you can make your file run much better by pre-computing the integral so that the CAS doesn't need to be loaded at all.


ie define

    g(x) = (-1) / 2 σ² erf(-sqrt(2) ((-1) / 2 μ 2 σ² / σ² + x) abs(σ) / (2σ²)) / (σ abs(σ))

    Φ_a = g(x(A)) - g(-∞)


and use that (yes, I know it can be simplified :) )


@slik: maybe delete this folder:

http://wiki.geogebra.org/en...

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Mike, thanks for the reminder. Working fine again. :)

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Hi Michael,

precomputing the integral helps, I've tested it and now it's even visible in Geogebra-Tube.


Thanks Werner

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