I have a system of two ODE's. One is of the form dT/dt=a*(dc/dt)-b, where a and b are constants. The other is of the form dc/dt=-(c^2)*d*exp(j*(1/T-1/k)), where d,j, and k are constants. I need to find the maximum value for T. I can solve dT/dt via the separation of variables method to get and expression T=f(c,t). I then substituted this expression into dc/dt=f(c(t),t) and solved it numerically in Maple. How do I substitute the values of c(t) obtained in Maple into T=f(c,t) and find the maximum? Or is there a better method?

I'm trying to use Maple to solve an ODE instead of using partial fractions.  I can't get the syntax correct.  The original problem is...

 

dC = C(1-0.0002C)dt        C(0) = 2   for t >0

 

I know it's seperable into

         dC             = dt

C(1-0.0002C)

 

I can't get anywhere to find an explicit form!  Any help is appreciated :D

I want to open a file, in maple.  I do not want to open maple, and then open the file. 

More specifically, how do I

a) run something like:

maple -x -f myfile.mw

so that xmaple starts and opens directly to the file myfile.mw.  Ideally if xmaple is already running, it will hopefully just spawn a new tab.

b) set this up as a "Preferred application" in Fedora and in Ubuntu.

I think a) may solve b).

 

How could I obtain the 2 values (a, b are reals) of this complex number?

I tried

assume(a::real)

assume(b::real)

sqrt(a+i b)    and     (a+i b)^(1/2)  give back the input.

Thanks,             Sandor

Given several poins and a known center, how do I approximate a circle with an unknown radius with Maple?

I am totaly new using this software, so I don't know how to start.

Thank you for your help!!

I have the equation of a sphere x^2+y^2+z^2 = 36 and two points in three space P(-3,-10,2) and Q(5,14,8) and I need to show that the line between the points intersects the sphere graphically and analytically, but I cant even figure out how to graph them, and I have a suspicion, but am not sure, that to prove it analytically I would find the equation of the line in three space between the points and prove that the line equals the equation of the sphere in two places, but I cant figure out how to find that equation either.

Each line in my data file reads

[elm1, elm2, elm3, elm4]

I have the following lines to tally column 1:

> data:= map2(op, 1, datafile);

> Statistics[Tally](data);

I would like to tally the 3-tuples, [elm1,elm2,elm3], and it doesn't seem that Tally is able to handle a 3-tuple. 

I appreciate any help you can offer.

 

Hi,

I have an equation given by

( 15.3*r_1 - 0.6 + 5.7 * r_2 ) / ( 21.0*r_1 - 3.1 + 84.8*r_2 )

what command do I use to collect r_1 and r_2 so i get

(r_1 + r_2 ) * ...... -.....    /   (r_1 + r_2) *....... - ......

Hi,

if I have a equation

( 15,3440 * r_1 - 0.6329 + 5.7540 * r_2  )   / 

( 21.0981 * r_1 - 3.1780 + 84.8348 *r_2 )

How do I solve for r_1 and r_2 ?

The solutions should be r_1=0.175 and r_2=0.055

Hi all! I have such an issue: I have a set of non-linear expressions with two variables, right now I am trying to create a plot: {0 = -(1/345)*(-28704*b*a-11224*b*a^2)/a, 0

I've got a really serious problem about maple 12.It happened after I installed maple 12 software. The installation was successful,i activated the software successfully as well,but when i want to run the program.. the error message pop up... it said that "could not create java virtual machine".
I've tried everything i can to deal with this problem like restart the system,re-download and re-install the software,even re-install the java... which all turned out to be failed.I'm really looking forward to your help.

Dear all,

 I want to plot  one figure,  the codes in Maple 11 is as follows

I'm using a Mac Pro with Leopard, Maple12, and try to

use "define_external" to use a shared library I created (just a simple trial for now) but get the error:

> define_external('try_it', 'FORTRAN' , 'x'::float[8] , 'y'::float[8] , LIB="try/try_it.so");
Error, external linking: error loading external library try/try_it_ifort.so: dlopen(try/try_it.so, 129): no suitable image found.  Did find:
    try/try_it.so: mach-o, but wrong architecture
 

I compiled the library with:

Maple's Standard GUI has context-sensitive menus. Those are the menus that appear when one right-clicks on a output (or input, in a Dcoument).

Those context-menus can be customized.

Below is an example which adds a new submenu. The new submenu is populated automatically according to the types of thing found within the object itself.

It's an alternative to a menu-item that already exists, which shows up as "Help on Command". But that existing item only...

One way to enhance a package is to add to Maple's context-sensitive menus  some new menu entries which utilize that package's features.

In Maple's Standard GUI, context-sensitive menus (a.k.a. context-menus) appear when the mouse is right-clicked over (input or output) 2D Math expressions.

For a package implemented as a module, new and relevant context-menu entries can be created inside the module's ModuleLoad export. That will cause the new menu entries to be created (automatically...