Dear all

My goal us to show that equation (11) is exactly (q^n-1)/(q-1)*y^(n-1),   a  simplification must be introduced and so that we obtain the necessary (q^n-1)/(q-1)*y^(n-1). 
Note that the operators are not commutative.

Question.mw

Than you for your help

So I have recently finished up a project that took different sounds found in nature, and through the Spectrogram command, plotted the frequency of each sound over time with some really cool results!

https://www.maplesoft.com/applications/view.aspx?SID=154346 

The contrast between sounds produced by the weather such as tornadoes, thunder, and hail versus something as innocuous as a buzzing bee, a chorus of crickets, or a purring cat really shows the variance in the different sounds we hear in our day to day life, while also creating some very interesting imagery.

My personal favourite was the cricket chorus, producing a very ordered image with some really cool spikes through many different frequencies as the crickets chirped, as shown here:

Using this plot, we can do some interesting things, like count the number of chirps in 8 seconds, which turns out to be 18-18.5. Why Is this important? Well, there’s a law known as Dolbear’s Law(shown here: https://en.wikipedia.org/wiki/Dolbear%27s_law)  which uses the number of chirps in a minute for Fahrenheit, or 8 seconds for Celsius to calculate the temperature. Celsius is very simple, and just requires adding 5 to the number of chirps in 8 seconds, which gets us a temperature of 23C.

T_c= 5 + N₈

For Fahrenheit, it’s a bit more complicated, as we need the chirps in a minute. This is around 132 chirps in our case. Putting that into the formula:

T_F= 50 +((N₆₀ – 40)/4)

Which gets us 73F, or 22.7C, so you can see that it works pretty well! Pretty cool, huh?

There was also some really cool images that were produced, like the thunder plot:

Which I personally really like due to the contrasting black and yellow spike that occurs. Overall this was a very fun project to do, getting to tweak the different colours and scales of each spectrogram, creating a story out of a sound. Hope you all enjoy it!

In previous version of Maple (e.g. Maple 2015) I was able to copy
"2D Output" equations directly from a Maple Worksheet to MS Word.

These equations could be edited for fine element placement. In the 2017.3 version
it is does not seem to be possible anymore. When I copy the "2D Output" the image
is not copied only the text.

Is this a feature that was removed or a configuration problem ?

Thank you

LL 

Coding_Equilibria.mw

Hi, the coding answer I generate from maple is different from the real answer. Any solution?

The solution should be S=pi/mu*(mu-P*pi*mu+phi/mu+phi+vartheta) and V=pi/mu*(P*pi*mu+vartheta/mu+phi+vartheta)
 

Download Coding_Equilibria.m

Greeting

can u help me how to solve this problem using the galerkin finite element method with graphs.  I attachment below.

IBC

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