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:

Hi All,

I am trying to solve set of equations after applying boundary conditions.  There are 4 coefficients which I have to find by solving following 4 equations;

I tried to solve using the command solve({A, B,C,D},[E,F,G,H]), but it just returns [],  does anyone know which command to use for backward substitution of coefficients.  Also if I try to solve it separately, it says "recursive error"

Your help will be appreciated

Thanks

How to get n th term of an equation and total number of terms in equation?

for example if f := 2*x+3*y+2

any function can extract term from equation such as second term is 3*y

total number of terms is 3

I opened one of my worksheets this morning and started executing it using the ! tool. When it came to the first plot command, it replaced the previous plotted output by the following:

1 ************                                                                
  +          **********                                                       
  +                   ******                                                  
  +                         *****A...

I tried to solve the system of odinary differential equations. But system was not able to solve it. As a result i've obtained a error message displayed on the last line of my program. Give me advise please how to overcome this problem.

restart; unprotect(gamma); 
gamma := 1.322; 
m0 := 0.759e-22*0.1e-2; 
d[1] := 0.1e-2; d[2] := 0.2e-1; 
A[1] := (1/4)*Pi*d[1]^2; A[2] := (1/4)*Pi*d[2]^2; 
k[B] := 0.138e-22; 
T[res] := 300; 
kp := 0.1e6*(1/760); 

Hello everybody

I need to simplify (or even approximate ) a huge expression which is a two-variable function of x and t,

including  SinCos and Exp. ( it's length is like 10 pages ! )

I tried everything but nothing worked.

Please HELP !

it starts like this:

Q(x,t):=