@acer Excellent solutions! That is the first time I see the InertForm use that way. Thank you for your answer. I choose this one:

labels = [x*InertForm:-Display(10)^8*Unit(m), `t `(s)]

that give the right outplut. Is there a way to put the the unit of meter inside a ( ).

I forgot to ask you one more thing. As you can see, the horizontal axis was with 3, 6 and 9. Could you show me how to fix that so that plot always show that, even if I zoom the plot?

Again, thank you acer!

Mario

I tried the document without the ToInert and only using CompactDisplay like this:

>CompactDisplay((v, lambda)(r, t))

And the result of a double derivative is clearly displayed:

So I will go with that. Here the newer version of the file

General_metric_corrected.mw.

Thank you to all that help me.

Mario

@Christopher2222 Your use of ToInert is very interesting. I have used it and it worked, almost correctly. When calculating the Einstein's tensor, there is the elements G[3,3] and G[4,4] where the second derivative of both function does not show the aliases. I wonder if it would work if we were to use the formula R[mu,nu]-1/2*R*g[mu,nu]. Unfortunatly, I don't know how to do that in Maple. I get error all the time.

You will find the new corrected document here.General_metric_corrected.mw

I agree that it would be nice if the CompactDisplay could work for multivariables. Hoping that ecterrab will see this.

Thank you everybody for your help

@Hullzie16 ... but you need to interpret things.. For example, exp(- lamkbda * Lambda) = exp( - lambda) and (lambda * Lambda dot) to lambda dot. Anyway, thank you for that.

@Christopher2222 and I am not even sure it will be compatible with the physics package. But I will remember that trick for other calculations. So thank you for your time.

@acer You are right. I simply forgot about that palette. Sorry about that.

@nm I know that Maple added this functionality for a simple case. But you can do a lot for basic things. See the included document I just made (3-D Rotating vector.mw)

I love LaTeX. I am not a pro but I manage to do what I need. I use Texmaker for it. I will start with IPE and change if it cannot do what I need. Tank you for the suggestions.

Mario

3-D_Rotating_vector.mw

@Christopher2222 Thank you! But AutoCAD is out of the question and GImp is too complicated. I tried it and don't like using it.

@ecterrab It seems that some terms have disappeared in the manipulation. Very sorry about that. I am playing with your "Physics Courseware Support: Mechanics" document. I am trying to determine the best way to express things in conjunction with a document I am creating about using the Lagrangian in Mechanics. You can see that now it works perfectly. Thank you both (jbromell 20 too) for your answers.

Mario

Example_1_corr.mw

Thank you both for your responses. But my mistake was that y = 0 .. a, not b. This was not making everything working the way I was expecting it to work. Sorry for that inconvenience!

Mario :-(

@mmcdara  and  Carl Love 24237

Thank you very much both for your help. Problem solved.

@Christopher2222 

Thank you for taking the time to look that up. For an unknown reason, Maple refused to cooperate. But today, I tried it again and it works perfectly. So it was clearly again a question of windows interaction with Maple. I should have taken the time to restart windows and try again. Sorry for the trouble.

Mario

@ecterrab 

Thank you for taking the time to look that up. For an unknown reason, Maple refused to cooperate. But today, I tried it again and it works perfectly. So it was clearly again a question of windows interaction with Maple. I should have taken the time to restart windows and try again. Sorry for the trouble.

Mario

@ecterrab The d_ was the thing I was not sure.

Thank you very much Steve and Edgardo for all of this. One thing I am doing is to prove this two relations that I saw on the Web:

Of course, the notation at the right of the equations won't appear like that in Maple.  Thank you in advance.

Mario