Algebra Failure?

[TKHunny]

Maybe this one isn't news.

I'm still on v14 M020

[TKHunny]

Whoops! I mean v14 on the file name. I do NOT have a secret advance version.

[IRstuff]

Hello, Nathan,

Long time no see.


TTFN,
Eden

[TKHunny]

I see my last post was May 5, 2009. Not quite a year. 🙂

Did you get the error on whatever version you are running?

[Ninetrees]

I get no errors om Win XP Pro SP3 running M14 020.

I get 0.307 & 8.161; the algebra is correct; I assume the integral is correct.

Rich
http://www.downeastengineering.com/

[TKHunny]

You didn't notice that the integrals were the same?

[IRstuff]

M11 returns the first answer for both expressions, which matches the numerical engine's answer, and which is consistent with the graphs of the kernels.


TTFN,
Eden

[ptc-1368288]

On 4/25/2010 6:35:34 PM, tkhunny wrote:
...
>Did you get the error on
>whatever version you are
>running?
_________________________

In case it was done before, please "save as" Mathcad 11.
I will give it a try in Mathematica, just in case.
You can visit the Mathematica web "Integrator" [if still available].

jmG

[RichardJ]

On 4/25/2010 6:35:34 PM, tkhunny wrote:
>I see my last post was May 5,
>2009. Not quite a year. 🙂

Hi Nathan. Less than a year means you are still a "regular poster" 😉

>Did you get the error on
>whatever version you are
>running?

I see it in M030. As Tom points out, the indefinite integral is wrong.

Another strange bug shows up if you try and evaluate the limits.

Richard

[rmix22-disabled]

O
>>Did you get the error on
>>whatever version you are
>>running?
>
>I see it in M030. As Tom points out, the
>indefinite integral is wrong.

Its here in M020 and M030. Reminds me of a very similar bug which was posted here some time ago. I ran into another one which seems to have the same
According to PTC the bug is already fixed in MC15.


>Another strange bug shows up if you try
>and evaluate the limits.
Thats really strange. I have simplified it further it it gets more crazy. 1*sqrt(x^2) ist no problem but 2*sqrt(x^2) is causing the error.


Rmix

[ptc-1368288]

jmG

[TKHunny]

Thanks, Folks. Now what? Is there an official alert mechanism or does Mona keep an eye on us?

Did I miss v15 Beta already?

[TomGutman]

AFAIK there is no MC15 beta. AFAICT MC15 is just MC14M040, renamed to a full release for marketing reasons.
__________________
� � � � Tom Gutman

[RichardJ]

On 4/26/2010 8:28:59 PM, Tom_Gutman wrote:

"marketing"

I think you mean "money".

Richard

[TomGutman]

Yep. The indefinite integral seems to be incorrect for the second example.

There are a lot in bugs in symbolic intgegration in MC14, I don't know if this one is among the ones already known.
__________________
� � � � Tom Gutman