Hi,

How to compress the following equation to make it more easly readable.

A:=-1/2*Phi*(variphi*sigma*sinh(l*S0)*cosh(l)-variphi*sigma*sinh(l*S0)*sinh(l)-variphi*sigma*sinh(l*S0)*R1*cosh(l)+variphi*sigma*sinh(l*S0)*R1*sinh(l)+cosh(l*S0)*l*N_1*cosh(l)-cosh(l*S0)*l*N_1*sinh(l))/l/(-R1*R2*cosh(-l+l*S0)*sinh(l*S0)+sinh(-l+l*S0)*cosh(l*S0));

Thanks

If I have an ODE say dg/dx = g I can't seem to get a solution I can work with directly. Of course with dsolve I can get an expression which I can cut and paste into a function definition: ie.

ode:=diff(g(x),x) - g = 0

dsolve(ode)

g:=x->"output from dsolve"

But how do I get g(x) without the cut and paste. I have tried a number of ideas (rhs, subs) but I cannot get a function I can use  for example to calculate g(0) or g(1)

I am facing a problem dsolve/numeric, and I am attaching two files: dsolve-issue.mws and dsolve-issue2.mws the first one shows a simplified version of the problem, the second one is an actual example of one the DE systems I desperately need to solve. There are brief comments in the files describing the problem, but here is the summary:

Hi,

Maple 13 here. Is there a tutor which gives you a step-by-step solving process for linear 1st and 2nd order ODEs (similar to the one for Calculus/Integration Methods) ? I have been disappointed in not being able to find this, unless I am missing something.

thanks,
Andrew

Good Afternoon.

I have a problem with that project, because the when i move the dial (DialKp1) the component Mathbase don´t update the lat change.

I don´t know how can i do for updating it?

23-06-2011-modelo_di.mw

How to skip error and continue to run in procedure?

Hi Experts,

Here is my File. I use the DirectSearch2 Library.

Searching the Minimum works fine. (800 sec on i7 PC)

But the Datafit runs endless.

I tried to make the fit with min SSE that works, but why does DataFit not succeed?

Thanks for answering.

Walter

GroundWater_Solution.mw

Hello Everybody

for Solving a parabolic Inhomogeneous  PDE, I used the Green's Function,

I tried to simplify the Inhomogeneous term, But still can not calculate the answer.

this is my file : W111.mw

Please HELP !

I like the pretty print of maple, and I want to print the output to a file instead Maple document (if it could be, print in both of 2).

For example:

exprs := [ (a*x + b)/sin(x) = 0, (a*x^2 + b*x + c)/(d*x + e) = 0 ]:
print~(exprs);

And my output text file may be somthing like this:
                          a x + b    

As an exercise to find the solution of this equation,

         (a^(x+2))^(1/3)  =  (a^(x-5))^(1/2)

Maple 14 and 15 provide no answer, which preceding releases found to be x = 19,

but complain about a "numeric exception: division by zero"!

     Is that progress with Maple?

> r= r*cos(theta) + r*sin(theta);

le the ODE, ode.

> G=6.67 * 10^(-11);

> F1=(m*a);

> F2=(-G*M*m)/(abs(r^(3)));

> solve(m*a)=(-G*M*m)/(abs(r^(3)));

> with(DifferentialAlgebra:-Tools);
Error, `DifferentialAlgebra` does not evaluate to a module
with(DifferentialAlgebra):
> with(DifferentialAlgebra);
Error, invalid input: with expects its 1st argument, pname, to be of type {`module`, package}, but received DifferentialAlgebra

don't know why maple 12 give these error, how to import differentialalgebra package?

In an attempt to get better resolution I experience an error when I change to grid=[150,150]  Can we get better resolution? 

with(plots):

f:=exp(1/z):
complexplot3d(f, z = -.7-.7*I .. .7+.7*I, style = patchnogrid, orientation = [-90, 0], grid = [100, 100])

**edit - image not uploaded properly but shown a couple posts down

** Answer to zaxis range error part - The reason I couldn't increase the grid in Maple12 here is because...

I was warming by Maple that:

Warning, Exception in unload function 'free': Error, (in _free) invalid dictionary ID

What is it? I have no information about this warning.

I would like to calculate the power series solution of a set of ODEs. However, I know that this power series will contain non-integer coefficients, which are dependent on a (rational) parameter of the system, α. I'm solving the ODE by power series in the usual way, that is, by defining each of the solution variables as a function with the first few terms of their power series (with unknown coefficients), substituting these into the ODEs, and finding a series of the ODE which should be of the form: