I am trying to solve a coupled pair of PDEs (Burgers eqns) for u(x,t) and v(x,t).  However, my ICs and BCs are being rejected at the (0,0) corner of the domain. 

I have uploaded the code in the attached at this link.

PDE_rejects_IBCs.mw

Can anyone help please? 

Melvin

I have managed to install Maple2017 and open the installer using the Linux terminal and everything else but I can't find the file to run maple anywhere. I have been opening and doing everything with the linux terminal but I can't open maple without the filename as chromebook are fairly useless for downloading anything, does anyone know the name of the file or a way to make it run on chromebook? Thanks for any help offered in advance

How to read and write video file in maple?

i want to read one video file and then manipulate this to another file and then play two files to compare in maple

if maple 12 can not , which version can do?

I am trying to get jacobian computed for lorenz equations, not showing matrix, using Maple 2019 newest version. any guidance?

matrix.mw

Dear all

I have a set composed by vectors C(K), S(K) i would like to show that this set of vectors is orthogonal

That is, we pick any two different vectors and I compute the usual inner product and I verify if the result is zero or no

many thinks for your help  

orthogonal.mw

DE:=f'''(x)+f''(x)(cos(alpha)x+sin(alpha)f(x))/2=0;

ics:=f(0)=0,f'(0)=1,f'(x)=0 for x tends to infinity;

How to solve this DE im RK methods?

HI

Hot on the heels of my previous question https://www.mapleprimes.com/questions/227935-Multiply-Contents-Of-Vector-To-Get-Expected-Value#answer262336

I have attempted to maximize growth while keeping variance below a fixed level (with not much success), but 

can any of you maximize the growth of a 3 stock portfolio while minimizing the variance.

Efficient_Frontier.mw

How do I draw three graphs on the same axis of coordinates and I see this graph appear after the previous graph one second with the Maple command? Example : y = x, y = x², y = 1 - x.

Thanks so much for the help of everyone!

Hi everybody!

Quick question for you guys. I have access to Maple 2019 on my main computer and Maple 2018 on a remote Desktop (but I don't want to use because it's super slow and bad (normal rdp stuff)). The problem I have is for the same document, same line, same instruction, Maple 2019 on my computer is failling to do it correctly (unable to do the matrix correctly) and in the Remote Maple 2018 it's doing it just fine. I really don't understand. If someone can give me a little help it would be highly apreciated!

Maple 2018 (what it's supposed to do):

Maple 2019 (what it is not suppose to do):

Hi

I am doing a differential equation problem and decided to add units. However, when using dsolve i get the error:

"Error, (in dsolve) the units `s` and `1` have incompatible dimensions"
 

Can some of you experts see where i am wrong? 

Download Problem_1_test.mw

I am pretty certain that the problem here is simple, but only in the sense that what is counter intuitive to me is intuitive to most.
The final line as i have indicated ought to be a sequence of 1's, which should be evident upon inspection  of the code within the "for loop". But as you can see, it always has an additional count which is going to be an issue if I elaborate on this basis to further investigate. 

Can someone please explain to me why this occurs? I intented for a boolean as can be seen, only two outcomes, either the tally represented by the variable TRUE is incremented by 1, or the tally represented by the variable FALSE is incremented by 1.

I'm hoping it is sleep deprivation and it is simply because  I am not paying attention, but it's hard to tell if I am or am not, i know it's very funny yes i am a strange breed of crazy

Help appreciated in advance.

Download MAPLE_Q_29_09_2019.mw

restart;

with(DifferentialGeometry);
with(Tensor);

DGsetup([x, t], M1);

g := evalDG((dt &t dt) - t^2*(dx &t dx))
Geodesics()

I created a two dimensional cross-section of a spacetime described by this metric above. 

I would like to plot the geodesics in polar coordinates using the time t as the radius (normalized to our current time equal to unity).

That is, I would like to plot the geodesics starting at x=0, t=1 (x=0 maps to the top of the polar plot). X is the polar angle.

This plot is likely to map to this figure. Never mind the details of wiggles, or titles, etc.  I am new to maple and could use an initial push.

How to create a double underscore in a macbook air.  

I type G__[], the underscore disappears even on 1-D math.  I am using maple 2019.1, Mojave 10.14.6

I am trying to follow an example on geodesics 

with(Physics);

Setup(mathematicalnotation = true);
Setup(coordinates = X);

g_[];

I cannot reproduce the example because I cannot even create the syntax.