Dear Sir

I apologize, because I do not usually make manipulations in the System (Mac OsX)

While typing  cat( kernelopts( mapledir ), "/lib" ), I found the path to my Maple system library folder.

And by using the Unix terminal on my eMac, I see that this folder does not include a (old) file Physics2017.mla, but the following ".mla" files: MTM.mla, MathematicalFunctions.mla, maple.mla, update.mla.

For the moment, I do not dare copy the new Physics2017.mla in the library folder.

Is there not a possibility of conflicting some ".mla" files, e.g.  "update.mla" ?

I am trying to implement an example from page 106 in the book Essential Maple 7 in hope that I can understand a problem related to the "solve" function. The example is:

restart;
f[1] := c*x[1]^2*x[2]+9*x[1]^2+2*x[1]*x[2]+5*x[1]+x[2]-3;

f[2] := 2*x[1]^3*x[2]+6*x[1]^3-2*x[1]^2-x[1]*x[2]-3*x[1]-x[2]+3;

f[3] := x[1]^3*x[2]+3*x[1]^3+x[1]^2*x[2]+2*x[1]^2;

with(Groebner)

infolevel[primpart]:=5

gb:=gbasis([f[1],f[2],f[3]],tdeg(x[1],x[2])):

According to the book, I should receive an output that tell me what "content" has been removed. This will tell me what values of the parameter c have special solutions.

If I enter this in my version of Maple 2015 with no changes, I receive no output. This is not so surprising since the example was written for Maple 7. So I changed infolevel[primpart] to infolevel[all]. With this change, I receive some information, but it is rather general and not what I want.

Does anyone know if there is some other way to do this example in Maple 2015?

Thanks for your help.

Hi

I have an equation which i want solve it with DTM, but there are two problems:

1- How do I write a Dirak Delta function in maple for this equation?

2- I used pade approximation due to initial condition. Then how many sentenceses should be used to achieve the correct answer?

in this equation there are some constant parameter.

M:=0;A:=1;Phi:=0;r:=0.5;lambda:=0;phi[1] := 1.;  beta := .67;   phi[1] := 1.

then:

F[0]:=0;F[1]:=lambda;F[2]:=a/2;

That's my pleasure If there is somebody help me to code and solve this problem.

Thanks for every one very very much.

using the package geom3d

if I define two planes and attempt to find angle between them.

p1: 12-6*x-6*y-4*z = 0

p2: 3*x+3*y+2*z-6=0

and use the command FindAngle(p1,p2) then it returns arccos(2/11) any way to force maple to return a result in degree?

Hello ,

I need your helps to solve this integrale

Thank you
 

Download Intégrale.mw

Good day, I have an assignment in which I'm required to plot the solid that results from the cone (x^2+y^2-z^2=0), limited by the planes z=0 and x+2z=3. So far I've been trying to use plot3d and implicitplot3d, to no avail: the parametric expression from plot3d returns something quite different from the intented, and implicitplot3d won't allow the use of variable parameters.

Any ideas on how to solve this?

Hi everyone, I've just learnt some basic tools and I need your help. 

Dear Sir,

I have a problem with the command. In order to learn the use of this command for Feynman Diagrams, I loaded the help page [Physics,FeynmanDiagrams], I tried the given example  by accurately applying the indicated commands, i.e.

after setting Physics[Setup](mathematicalnotation = true);

"Coordinates(X, Y, Z)", next the Langrangian example  "L := lambda*phi(X)^4+sigma*eta(X)^3", then the command

"FeynmanDiagrams(L)".

The error maessage is :

"Error, unexpected result from Typesetting" ,and also "

"Error, unexpected result from Typesetting".

Note these errors appear also in the help page itself.

When I click on the link included in the error message, I go on a web page indicating "There is no help page available for this error", and they recommend to discuss my problem with Maple experts on MaplePrimes.

I sew that _NP represent the normal product of fields.

Could you say me, please, where is the error ?

Many thanks

  JLPaillet

I am new to Maple. I am trying to numerically evaluate the following function with respect to the 3 variables "xop", "yop", and "tp". All other variables appearing in the function f are known (i.e. "x", "y", "z", "Pe", also "Pi" is the constant 3.1415...). "f" is shown below:

f := exp(-1/2*(xop^2+yop^2))*exp(-((x-xop-2*Pe*(t-tp))^2+(y-yop)^2+z^2)/(4*(t-tp)))/((4*Pi^(3/2))*(t-tp)^(3/2))

I am then defining "deltaT" as equal to the triple integral below:

deltaT := int(f, [yop = -(-xop^2+1)^(1/2) .. (-xop^2+1)^(1/2), xop = -1 .. 1, tp = 0 .. t])

When I try to evaluate this, Maple spits out an incredibly long answer full of variables and error functions:

deltaT := -0.7957747155e-1*(int(sqrt(5.-1.*tp)*(int(exp((0.5000000000e-2*(-200.*tp^2*xop^2+40000.*tp^3-4000.*tp^2*xop+2200.*tp*xop^2-617200.*tp^2+41860.*tp*xop-6050.*xop^2+3.170694*10^6*tp-109230.*xop-5.423499*10^6))/((-11.+2.*tp)*(-5.+tp)))*(erf((.1000000000*(10.*sqrt(-1.*xop^2+1.)*tp-55.*sqrt(-1.*xop^2+1.)-3.))/(sqrt(11.-2.*tp)*sqrt(5.-1.*tp)))+erf((.1000000000*(10.*sqrt(-1.*xop^2+1.)*tp-55.*sqrt(-1.*xop^2+1.)+3.))/(sqrt(11.-2.*tp)*sqrt(5.-1.*tp)))), xop = -1 .. 1))/((5-tp)^(3/2)*sqrt(11.-2.*tp)), tp = 0 .. 5))

Any help on figuring out why it is unable to numerically evaluate would be appriciated!

Thanks.

Hello all,

I would like to know how to make computations on Quantum Field Theory questions.

For example: to write Feynman diagrams for some interactions, obtain the S matrix of scattering amplitude, then deduce the diffrential cross section.

If anyone is working on these issues in the Maple community, I would be very interested.

Best regards

Jean-Luc Paillet

Hello all

when i tried to use the library "with(VLA)" i always have this problem :

 with(VLA);
Error, invalid input: with expects its 1st argument, pname, to be of type {`module`, package}, but received LA
 

but i have sow in many videos that its working and they applied it in same way.

any help please > >  

Hello dear!

I want to find the vector field of a vector field my approch is below:

with(VectorCalculus);
SetCoordinates(cartesian[x, y, z]);
V := VectorField(<(u(x, y, z), v(x, y, z), w(x, y, z))>);
Gradient(V);

I want answer as bellow:

Matrix(3, 3, {(1, 1) = Diff(u, x), (1, 2) = Diff(u, y), (1, 3) = Diff(u, z), (2, 1) = Diff(v, x), (2, 2) = Diff(v, y), (2, 3) = Diff(v, z), (3, 1) = Diff(w, x), (3, 2) = Diff(w, y), (3, 3) = Diff(w, z)});

Please help me to fix this problem. I am waiting the quick answer.

THANKS in advance

Hello people in mapleprimes

I asked a question for a similar thing before.
https://www.mapleprimes.com/questions/222751-PDEtoolsdeclare

The question I had then is not solved yet in my mind, so I think  I will ask you
again. It is about differentiation of a composite function.

with(PDEtools):
declare(f(x,y,z),g(t,y));
a:=f(x,y,z);
b:=x=g(t,y);
c:=eval(a,b);
d:=diff(c,y);
OFF;
e:=d;

h:=convert(e,diff);

For both e and d, the notation of D__1 and D__2 appear.
And, even if, with convert, I changed them to another form,
what I can get is more complicated form of h.

Is it inevitable to use D__1 and D__2 brabra in the differentiation of
composite function?

I am writing this question thinking that if there is a way of go around it,
 I want to know.

And, though this is the second question, even if I use latex( ) command,
natually, codes of Tex I can get is that of the output shown on the screen, including D__1 and D__2, even though I want it to be shown with f__x and f__y or that including prime. Then, I have to edit that tex file, changing D__1 to f__x etc. which I think is very complicated modification of the text file.
I wish there is a way to modify it in Maple so as it to be direct TeX codes which  do not require me to modify.
Is it impossible to do such a thing?

Thanks in advance.

diff_2.mw

How to find the range of poset?

i would like to search the range of range is equal to the range of domain after solve system.

it may not exactly equal but around 80% of elements in range belong to the range of domain

if it is not factorisation domain,

how to generate ideal with function in maple?

On the help page, the description says the remove function does the opposite of select.
when I run:

remove(has, D[1](xx[0]), {xx[0]})

it gives: D[1]()

while: select(has, D[1](xx[0]), {xx[0]})

produces: D[1](xx[0])

I find this during programming. 

Is there a way to remove the whole expression "D[1](xx[0])"

Many thanks!