Dear friends! I am facing problem to solve the below system of ODEs numerically please find the mistake and correct it.

alpha := -1; R := 2; m := 2; Pr := 7; Le := 1.25; Nt := .2; Nb := .2; g := .5; K1 := .1; Q := .5

Eq1 := eta^3*(diff(F(eta), eta, eta, eta, eta))+alpha*(eta^4*(diff(F(eta), eta, eta, eta))+eta^3*(diff(F(eta), eta, eta))-eta^2*F(eta))-2*eta^2*(diff(F(eta), eta, eta, eta))+3*eta*(diff(F(eta), eta, eta))-3*(diff(F(eta), eta))+eta*R*(diff(F(eta), eta))^2-3*eta*R*F(eta)*(diff(F(eta), eta, eta))+3*R*F(eta)*(diff(F(eta), eta))+3*eta^2*R*F(eta)*(diff(F(eta), eta, eta, eta))-eta^2*(diff(F(eta), eta))*(diff(F(eta), eta, eta))-M^2*(eta^3*(diff(F(eta), eta, eta))-eta^2*(diff(F(eta), eta))); Eq2 := eta*(diff(G(eta), eta, eta))+alpha*Pr*eta^2*(diff(G(eta), eta))+R*Pr*F(eta)*(diff(G(eta), eta))+Nb*eta*(diff(G(eta), eta))*(diff(H(eta), eta))+Nt*eta*(diff(G(eta), eta))^2+diff(G(eta), eta)+Q*Pr*eta*G(eta) = 0; Eq3 := eta*(diff(H(eta), eta, eta))+alpha*Le*Pr*eta^2*(diff(H(eta), eta))+R*Le*Pr*F(eta)*(diff(H(eta), eta))+Nt*eta*(diff(G(eta), eta, eta))/Nb+Nt*(diff(G(eta), eta))/Nb+diff(H(eta), eta)-g*Le*Pr*eta*H(eta)-Le*Pr*K1*eta = 0;

IC1 := F(0) = 0, F(1) = 1, (D(F))(0) = 0, (D(F))(1) = 0, (D(G))(0) = 0, G(1) = 1, (D(H))(0) = 0, H(1) = lambda; dsys1 := {Eq1, Eq2, Eq3, IC1}; dsol1 := dsolve(dsys1, numeric, continuation = lambda, range = 0 .. 1);

dsol1x := subs(dsol1, F(eta));

dsol1y := subs(dsol1, G(eta)); dsol1z := subs(dsol1, H(eta));
 

With my best regards and sincerely.

Muhammad Usman

School of Mathematical Sciences 
Peking University, Beijing, China

Hi all

I have 4 - 2a and (2x^2 - 2x + sqrt(2))^2. How to factor it become 2(2-a) and 2(sqrt(2)x^2 - sqrt(2)x + 1)^2 ?

Thanks you very much.

Hello people,

I am looking to use Maple and its loops, to develop the tensorial expressions in index notations such as this one:

My Sigma[11] is supposed to be a summation of the terms obtained when i then j are vary throughout the values, 1, 2 3 

Thanks

Hi,

I am looking for a way of exporting a large number of Maple files (*.mw) into text files (*.txt) automatically. Here are two questions:

• Is there a ready-made tool allowing to do this?
• If not, is it possible to export a maple file to text from the command line interface?

Thanks!

Samuel

Hey guys,

I have this (6x1) matrix:

And I wish to factor a vector of the recurring terms out of it, this particular vector:

So that I end up with a (6x6) Matrix multiplied to that vector.

Thank you

I get no output from the following

deqv := m*v(s)*(diff(v(s), s)) = m*g-k*v(s)^2

I have to write

solv := `assuming`([dsolve({deqv, v(0) = v__0}, v(s), implicit)], [v__0 > 0])

in order to get

-g*m/k-exp(-2*k*s/m)*(-g*m/k+v__0^2)+v(s)^2 = 0

and then I have to write my own function

It should be a piece of cake for maple to solve this!

Staffan

I was curious to know if one can extract a specific solution from a LPSolve routine. 

As an example, consider the following output to a constrained linear problem. The objective value is 8 and the decision variable values (binary) are given.

Sol := [8, [w[1, 1] = 1., x[0, 0, 1] = 0, x[0, 1, 1] = 1, x[0, 2, 1] = 0, x[1, 0, 1] = 0, x[1, 1, 1] = 0, x[1, 2, 1] = 1, x[2, 0, 1] = 0, x[2, 1, 1] = 0, x[2, 2, 1] = 0, y[0, 0] = 0., y[0, 1] = 0., y[1, 1] = 2.]]

I am interested to know if we can isolate any variable value from this solution. I know that Sol[1] will return 8, and Sol[2] will return the remaining terms. But what if I wanted, say, x[1,2,1] alone?

Thanks for reading!

A bit of an annoyance. 

typing 'numerator' / 'denominator' generates an error.  The first quote never gets automatically grouped as it should.

Two workarounds.  The first is to move to, and delete the first quote and re-enter it again in front of numerator.
The second is to use brackets, although one shouldn't have to.

Hi

I have this problem that my computer crashed during Maple 2016.1 to 2016.2 update.

Now it won't start at all.

I have tried reinstalling Maple several times, tried not updating to 2016.1 and running the program as vesion 2016.0.

I get this error in my eventlog, when I try to run the program.

Name of program errors: javaw.exe, version: 8.0.1020.14, timestamp: 0x576af3f4
Name of the module with error: nvSCPAPI64.dll, version: 7.17.13.7849, timestamp: 0x588218a5
Exception code: 0xc0000409
Displacement by mistake 0x0000000000034b2f
Process ID 0x166c
The program's start time 0x01d279add4515202
Program path: E: \ School Program Files \ Maple 2016 \ jre \ bin \ javaw.exe
Module path: C: \ Program Files (x86) \ NVIDIA Corporation \ 3D Vision \ nvSCPAPI64.dll
Report ID: d52f952d-8fd2-4130-890a-196e6a7bdc92
Full name of the program with the error:
Relatively application ID for program errors:

So as my titel suggests I need help to remove all files associated with Maple so I can install the program anew. It has worked fine for over a year so far. Only stopped working after that crash.

I have even tried installing the older version, Maple 2015 and it doesn't work either, so I am guessing the files which are corrupted aren't removed during a normal uninstall process, and they are shared among the versions of the program.

Thanks in advance :)

Hi everybody, 

The sequence 
    writeto(MyFile)
    showstat(Myproc)
keeps printing the result on the screen

How is it possible to redirected the output of showstat(Myproc) into a file ?

Thanks in advance

Hello,

I've just started to use Maple 16, and I can't seem to get a neat result, when I use the solve function to solve 4 equations with 4 unknown constants.

I've posted my calculations.

How can I get a simpler result? I found a simplification command, but that didn't help

Where I made a mistake I got this error in for loop and how to fix it?

Download quest.mw

Is there a problem with MaplePrime web site?   All my questions for the last 4 years, and answers are no longer available. All gone. I posted a question early today about sin(x) calling. one hr after that, I noticed all my questions and answers gone.

When I go to my user profile, it says I have zero questions, zero answer and zero post for the last 4 years. All the answers to my questions also got deleted, which is a shame if this happened. They have many useful information.

Any one else affected by this?

 I need help regarding this figure. i want to write both equations in maple 18. Second equation is related to first equation.So, please help me to write this code. I will be grateful. 

I have a need to calculate base 2 math as would be done in an integrated circuit. Math will be done using 15 bit 2's complement mantissa and 8 bit exponent. (the exponent is always assumed to be negative) We need to perform multiplication and addition, where each internal operation is represented by such a number.

The goal is to best represent the errors associated with such calculations and export the resulting code to a hardware description language for implementation on an integrated circuit.

Is there a package in Maple that can do that? Any advice on how te proceed?