MaplePrimes Questions

Hello

Hope everything going fine with you. I am facing problem to fine the exact (numerical) solution of the attached system of linear PDEs associated with BSc and ICs. I tried to solve it without BCs and ICs, with BCs and with ICs also all the times I failed. Please solve it either general, with ICs or BCs. You can try to solve it numrically. In attached file H(t) represent the unit step function. I am waiting your positive response.

PDEs_solve.mw 

With my best regards and sincerely.

Muhammad Usman

School of Mathematical Sciences 
Peking University, Beijing, China

hi ..how i can rewrite answer in compressive format. that result seen readible and incomplex.for example how i can use change of variable, in order to final result has a short format...

thanks1.mw

 

Why would firewalls cause issues with connecting to the maple kernel if the CAS is entirely self contained (as ive been told before on this forum)

I am having issues with Maple 2016 computing closed form solutions using the sum command. For example, sum((-1)^n, n = 1 .. infinity) evaluates to -1/2 in the help topic, however, when I run the command in a maple document, this result is not obtained. It instead returns sum((-1)^n, n = 1 .. infinity). Likewise, sum( a*r^k, k = 0..infinity) doesn't evaluate to -a/(r-1). How can I get Maple to determine closed form solutions for power series?

Why do you need `or` in an if-test if say:

if `or`(seq(R[i]=R[k], k=1..i-1)) then
.......
end if;

If I run the test without the `or` (Boolean type logical, I know) it does not work.

Can anyone help me?

How get answer of this integral

int(1/u.t.exp(-t/u), t = 0 .. infinity)

Hello,

To have to better overview of a package, I would like to be able to group/ ungroup all the lines inside a subpackage as it is possible to do for example in a worksheet.

Is there a possibility to group lines (as a section) inside a package ?

Thank you for your feedback


 

dsolve({Q(0) = 0, Q(t) = (1.375*4190)*(80-T__1(t)), Q(t) = (1.375*4190)*(T__2(t)-38.2), diff(Q(t), t) = (240*0.1375e-1)*(T__1s(t)-T__2s(t))/(0.1e-2), diff(Q(t), t) = (0.1375e-1*47.6035070726347)*(T__1(t)-T__1s(t))*(T__1(t)+T__1s(t))^.438263122318020*((T__1(t)-T__1s(t))^.327228811371115), diff(Q(t), t) = (0.1375e-1*47.6035072491656)*(T__2s(t)-T__2(t))*(T__2(t)+T__2s(t))^.438263121701134*((T__2s(t)-T__2(t))^.327228811154163)}, numeric)

could you help with this? maybe because of too long exponents or just a maple bug?

when i try to solve this DAE it just crash. it says connection with kernel has been lost, and tells me to look for online help.

thank you very much...
 

Download crash_ecuation.mwcrash_ecuation.mw

Hello!

Hope everyone good. I am facing problem to define a loop. Actually I want to solve the attached file for different values of H like H=[100,125,140,160] for this I don't know how to tackle it. My program do working on single value of H. Please solve my problem as soon as possible. I am waiting your positive response. 

Help.mw

With my best regards and sincerely.

Muhammad Usman

School of Mathematical Sciences 
Peking University, Beijing, China

How can I embedded a Maple program in Powerpoint to show it. Does there is a Powerponit plugin for maple?


Maple Worksheet - Error

Failed to load the worksheet /maplenet/convert/Question.mw .

Hello, Maple is giving me the error:

"Error, (in simplify/table) too many levels of recursion"
 

Once I take the integral of an expression I am getting the error. It starts at the first integral of the document. 

Note: If I make another maple worksheet and write the expression of the integral without writing it shorthand by substituting the functions in it seems to give me an answer. 

For example instead of the integral of say, y(x)*f(x) I would write out the definitions of the functions in the integral and it would give me an answer while the former would give me the error. 

I have uploaded the document, Any help would be appreciated. I'm not sure if there is a fix or not. Thanks

Question.mw
Download Question.mw

Hi All.

I keep getting a incorrect plot of: plot3d(2*x/(x^2+y^2), x = -10 .. 10, y = -10 .. 10)

plot3d(2*x/(x^2+y^2), x = -10 .. 10, y = -10 .. 10)

The negative range excursion is not appearing.

I have tried changing the domains and range settings but to no avail.

I have also tried placing brackets around the numerator and denominator but again to no avail. I also repeated the plot of earlier functions, on the same sheet, below the above function and had no problems with them. See the function below as an example of a good graph plot.

I noticed that the program flashes a negative value graph on screen and then only displays a positive result as shown above.

Good plot of: plot3d((-2*x^2+2*y^2)/(x^2+y^2)^2, x = -10 .. 10, y = -10 .. 10)

plot3d((-2*x^2+2*y^2)/(x^2+y^2)^2, x = -10 .. 10, y = -10 .. 10)

This example shows both the negative and positive f(x,y) values and surfaces.

Can anyone explain what is going on.

What I may be overlooking.

Is there a flaw in Maple 15?

I can get the correct graph using Microsoft Math which is a much less sophisticated program.

Omicron1

 

How to use IterativeMaps:-Bifurcation for two or more dimensional maps. For example, f(x,y)=x*exp(r1*(1-a11*x-a12*y)), g(x,y)=y*exp(r2*(1-a21*x-a22*y)).

If I set a11=1,a12=2,a21=3,a22=4,r2=1, then how can I get the bifurcation rsp r1. Thanks very much!

I tried to solve a symbolic nonlinear system, which is shown as following:

The S,T,B is three parmeters. And I want to express X and Y by S,T,B.

However, when I use eliminate({},{}), an Error comes as following:

Error, (in SolveTools:-Basis) invalid input: ListTools:-Transpose expects its 1st argument, L, to be of type listlist, but received [[1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0], [0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0], [1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0], [0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0], [1, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0], [0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0], [1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0], FAIL, FAIL, [0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0], [1, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0]]
 

I have no idea about this problem, who can give a help?

The mw file is given: Eliminate.mw

Thanks!

 

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