lemelinm

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14 years, 184 days

 

 

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Mario Lemelin
Maple 14.00 Win 7 64 bits
Maple 14.00 Ubuntu 10,04 64 bits
messagerie : mario.lemelin@cgocable.ca téléphone :  (819) 376-0987

MaplePrimes Activity


These are replies submitted by lemelinm

@John Fredsted 

The input should be:

>`ℏ`

Your solution is perfect.  Since it must be equal to 0, that solve the problem of the exponential. 

But how to ask Maple to explicitely do the second part of the calculation?  I mean to force it to show the partial derivative of Psi(X) so I can confront it with my result.

I am learning a lot and I thank you for this.

I have done the calculation.  Now I want to check if this calculation is the same as the one I obtain after calculating the limit hbar -> 0.  So I need to do this:

>eq1:=g_[`~mu`, `~nu`]*d_[mu]*F*d_[nu]*F

where F is the exponential function exp(I Psi(r,t)/h).  When I do the Check(eq1,all), it said that "The products in the given expression check ok.".

Now, I want to see the result of that calculation but I cannot find the information I need in the help pages.

What should I do?

Again, thank you for your help.

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Mario Lemelin
Maple 2016 Win 10 -  64 bits
messagerie : mario.lemelin@cgocable.ca
téléphone :  (819) 376-0987

Thank you very much for this fast way to setup the metric. But what about theta and phi since I choose a time and a plane?

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Mario Lemelin
Maple 2016 Win 10 -  64 bits
messagerie : mario.lemelin@cgocable.ca
téléphone :  (819) 376-0987

@Christopher2222 

 

Thank you again!  Now I will be better equipped for the next course where I will have to manipulate more data.

@Christopher2222 

 

Thank you for that result.

@Markiyan Hirnyk 

not a lot.  I never really study data analysis.  For example, we see that there is an oscillation with a long period that move the data like a sine wave.  The idea is to find that equation so I can remove it from that data so I will have the small oscillations an a straight line.  Then I suppose that we must use a Fourier's series like sum(a[i]*sin(...)+b[i]*cos(...).

It seems to be more easy if you have Matlab, which I have (R2015b) but I see that this version will be available only from Maple 2016 and that I will have to buy Simulink.  So befor buy this suppplemental product, can it be done in Maple alone?

 

Thank you for your help Markiam.

After thinking about it, there should be more than two sin waves in this problem.

I have attach her a document for a very simple calculation.  If I want to resolved the problem with tensor, how should I do it.

 

DirectProductofTensors.mw

 

I know that I have to do this:

restart:with(Physics):with(DifferentialGeometry):

and some Setup(coordinates( )).

 

Plese keep in mind I am only beginning with this package.

 Juste added:  Another problem I would like to do:

DirectChangeof_Base.mw

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Mario Lemelin
Maple 2015 Ubuntu 14.04 - 64 bits
Maple 2015 Win 7 - 64 bits messagerie : mario.lemelin@cgocable.ca téléphone :  (819) 376-0987

@acer I now have the name of the book that they use.  And it is clear that it is lbf.  So again, thank you for your quick answers.  I am always wondering why do they stick to FPS?

Thank you Acer

 

Wiht your help, I realize that I should use the unit "lbf" because they talk about pound-force, wich is not the same to poundal.

In Wikipedia, I read that: «The pound or pound-force (symbol: lb, lbf, or lbf) is a unit of force used in some systems of measurement including English engineering units and the British Gravitational System

 

So in Maple, 1 lbf = 4.44822 N and 1 N = 7.233 poundal.  And sice it is a course in engineering given in the US, i should take lbf wich was abbreviate in the course ot simply lb.

 

Do you agree?

 

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Mario Lemelin
Maple 2015 Ubuntu 14.04 - 64 bits
Maple 2015 Win 7 - 64 bits messagerie : mario.lemelin@cgocable.ca téléphone :  (819) 376-0987

@ecterrab 

Thank you very much for this response.  And thank you for the *.mw file.  Always appreciated.

 

Mario

Thank you Markiyan Hirnyk for that post.  I have done that competition 2 times.  It was for me hard but fun to do.  I will go back to the site.

 

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Mario Lemelin
Maple 18 Ubuntu 13.10 - 64 bits
Maple 18 Win 7 - 64 bits messagerie : mario.lemelin@cgocable.ca téléphone :  (819) 376-0987

@ecterrab 

 

I can wait to see what you will add.  For the moment, I will look into the ?Physics,examples.  It is a good start there.

@Andriy 

 

Thank you very much.  It is what I was looking for.   And with the file answer,mw, I will be easier to pratice.  It surprise me a little bit that many commands are quite long.  But at least, it is a beginning.

I appreciate what you gave to me as answer.  Since I am with M18, I will use the solution of Markiyan Hirnyk.

You solve my problem.  But it is quite a long command.  I would have thought that a simple rand(-1..1) would be enough.  Maybe a randomize at the beginning.  But for the moment, this will do fine.

Thank you again.

 

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Mario Lemelin
Maple 18 Ubuntu 13.10 - 64 bits
Maple 18 Win 7 - 64 bits messagerie : mario.lemelin@cgocable.ca téléphone :  (819) 376-0987
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