lemelinm

1410 Reputation

13 Badges

14 years, 180 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 answers submitted by lemelinm

 What would be nice is the possibility to have a list of names that are assigned (wich indets({anames('user')}) does fine) but WITH the values that are assigned to them.  It could be something in the view menu of Maple, for example, View -> Assigned.  Then a window open in wich you have a list of the names assigned with their values.  You could also have the ability to uncheck a box (beside each name) to remove the assignment.  Then clicking on the OK button remove those assignments.

Just an idea...

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Mario Lemelin
messagerie : mario.lemelin@cgocable.ca
téléphone :  (819) 376-0987

@Alec, Thanks.

@Acer, It's a confusion with the french word "décimal" that must be understand in the sense of "rationnal number in floating-point format".  I admit that it's the first time I read about the definition "decimal number".  Even at the university I never heard that defintion in the courses I took.  I will look into it.  Thanks.

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Mario Lemelin
messagerie : mario.lemelin@cgocable.ca
URL : http://groups.google.ca/group/MapleFR?hl=fr
téléphone :  (819) 376-0987

 For my part, I use GiftedMotion 1.14 that you can find at the following link:

http://www.onyxbits.de/giftedmotion

You just choose the animated gif you want and you can change the number of repetitions you want.  It work in Linux Windows and Mac for the siomple reason that it's a *.jar program (Java)

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Mario Lemelin
messagerie : mario.lemelin@cgocable.ca
URL : http://groups.google.ca/group/MapleFR?hl=fr
téléphone :  (819) 376-0987

 I gived the intersection of the two curves.

Toutes mes excuses...

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Mario Lemelin
messagerie : mario.lemelin@cgocable.ca
URL : http://groups.google.ca/group/MapleFR?hl=fr
téléphone :  (819) 376-0987

 First, define the two functions

>y1:=y=2*(x-4)^2-18;
>y2:=2*x^2-8*x-16;

1) the intersection is place where y1=y2
2) in Maple, you use solve (see ?solve) to answer your question

3) your's to do

4) in Maple, you use plot (see ?plot)

These are basics.  If you run into problem, show what you have done.
Then I am sure someone will help you.

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Mario Lemelin
messagerie : mario.lemelin@cgocable.ca
URL : http://groups.google.ca/group/MapleFR?hl=fr
téléphone :  (819) 376-0987

 A great add-on for Firefox in the toolsbar.  As I  am writing this, the java applets are still not started in Oracle for plotting y=f(x)...

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Mario Lemelin
messagerie : mario.lemelin@cgocable.ca
URL : http://groups.google.ca/group/MapleFR?hl=fr
téléphone :  (819) 376-0987

 Try the following command.

op(-1,A)

The info you are looking for is there.  If I understand correctly what you want.

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Mario Lemelin
messagerie : mario.lemelin@cgocable.ca
URL : http://groups.google.ca/group/MapleFR?hl=fr
téléphone :  (819) 376-0987

 

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Mario Lemelin
messagerie : mario.lemelin@cgocable.ca
URL : http://groups.google.ca/group/MapleFR?hl=fr
téléphone :  (819) 376-0987

 Take a look at the user's manual page 262 - Tables and the Classic Worksheet

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Mario Lemelin
messagerie : mario.lemelin@cgocable.ca
URL : http://groups.google.ca/group/MapleFR?hl=fr
téléphone :  (819) 376-0987

 

L1 = exp(2)
L2 = 1/2 L1 = exp(2)/2
L3 = L1+L2 = 3/2*exp(2)
but a quick look show that L3 = L1.  I was showing this on the
blackboard to warn about the danger of "re-arranging terms" in series
if you don't watch first the convergence.
I was trying to kill a bug with a Kalachnikov... 
Thanks Acer
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Mario Lemelin
messagerie : mario.lemelin@cgocable.ca
URL : http://groups.google.ca/group/MapleFR?hl=fr
téléphone :  (819) 376-0987

 >student[changevar](sqrt(x-y) = g, f3)

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Mario Lemelin
messagerie : mario.lemelin@cgocable.ca
URL : http://groups.google.ca/group/MapleFR?hl=fr
téléphone :  (819) 376-0987

 >student[changevar](sqrt(x-y) = g, f3)

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Mario Lemelin
messagerie : mario.lemelin@cgocable.ca
URL : http://groups.google.ca/group/MapleFR?hl=fr
téléphone :  (819) 376-0987

>P := implicitplot(x*y-1, x = -2 .. 2, y = -2 .. 2):

>Q := <(op(indets(P, Array)))>

You will have a matrix with 2 columns.  You can, for example, insert a spreadsheet and import the data or save the matrix as a text file.

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Mario Lemelin
messagerie : mario.lemelin@cgocable.ca
URL : http://groups.google.ca/group/MapleFR?hl=fr
téléphone :  (819) 376-0987

For a unknown reason, I cannot upload the file so send me your e-mail directly to me and I will send you the file that work now (at least on my Maple 13)

 

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Mario Lemelin
messagerie : mario.lemelin@cgocable.ca
téléphone :  (819) 376-0987

you will have to understand the way to do it by hand.

>with(inttrans):
>alias(X=laplace(x(t),t,s)):
>alias(Y=laplace(y(t),t,s)):
> deq1 := diff(y(t), t, t)-(diff(x(t), t, t))+diff(x(t), t)-y(t) = exp(t)-2;

             /  2      \   /  2      \                                 
             | d       |   | d       |   / d      \                    
     deq1 := |---- y(t)| - |---- x(t)| + |--- x(t)| - y(t) = exp(t) - 2
             |   2     |   |   2     |   \ dt     /                    
             \ dt      /   \ dt      /                                 
> deq2 := 2*(diff(y(t), t, t))-(diff(x(t), t, t))-2*(diff(y(t), t))+x(t) = -t;

                 /  2      \   /  2      \                           
                 | d       |   | d       |     / d      \            
       deq2 := 2 |---- y(t)| - |---- x(t)| - 2 |--- y(t)| + x(t) = -t
                 |   2     |   |   2     |     \ dt     /            
                 \ dt      /   \ dt      /                           
> ci := y(0) = 0, (D(y))(0) = 0, x(0) = 0, (D(x))(0) = 0;

             ci := y(0) = 0, D(y)(0) = 0, x(0) = 0, D(x)(0) = 0
> e1 := eval(laplace(deq1, t, s), {ci});

                         2      2                   s - 2  
                  e1 := s  Y - s  X + s X - Y = - ---------
                                                  (s - 1) s
> e2 := eval(laplace(deq2, t, s), {ci});

                            2      2                   1 
                   e2 := 2 s  Y - s  X - 2 s Y + X = - --
                                                        2
                                                       s 
> solve({e1, e2}, {X, Y});

                   /      2 s - 1               1        \ 
                   |X = -----------, Y = ----------------| 
                  <            2  2        / 2          \ >
                   |    (s - 1)  s       s \s  - 2 s + 1/| 
                   \                                     / 

 

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Mario Lemelin
messagerie : mario.lemelin@cgocable.ca
téléphone :  (819) 376-0987

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