Hi,
I am trying to create a sheet to show the derivation of 2nd and 4th-order function derivatives as part of a 5-point finite difference scheme for a 1-D model (a continuous beam on an irregular foundation). I have isolated 2 simultaneous equations by using Taylor polynomials and would like to cast these in matrix form and then solve for each of the D-operators symbolically. Is there a simple way to do this or do I have to work with the ops manually?
thanks for any help,
Neil

I have difficulties understanding why exactly Maple finds the question difficult to answer.
First attempt:
assume(a>0); a:=sqrt(b^2); eval(a, b=2);
(1/2)
/ 2\
a := \b /
(1/2)
4
I suppose the problem is that after the assignment Maple forgets the assumption a>0(?). Is there a way to make _real_ assumptions on variables, which Maple will not forget and possibly warn me if I try to violate?

Dear All,
I have two odes,
dX/dt = -X(t)*Y(t) and dY(t)/dt = X(t)*Y(t)
I can solve these numerically using the following code:
```
eq_1:=diff(X(t), t)=-X(t)*Y(t);
eq_2:=diff(Y(t),t)=X(t)*Y(t);
IC:={eq_1, eq_2,X(0)=10,Y(0)=1};
F:=dsolve(IC, {X(t),Y(t)},type=numeric, method=rosenbrock);
h := theta->eval(X(t),F(theta));
h(1);
```

However, I would like to add perturbations at specific time points. For example, at t=10, set X=5, or at t=15, Y=0. How should I do this in maple?
Note: my actual situation involves a 100 odes.
Thanks,
Colin

How can I write a recursive algorithm on maple wich gives me the fibonacci polinomies knowing that:
F1(x) = 1
F2(x) = x
Fn+1(x) = xFn(x) + Fn−1(x), n = 2, 3, ...
i think it's easy but still can't do it...if anyone knows help me please

I subs (a^2=4b, expression) and get
(1+b)*x^2+a*(1+b)*x+b(b-1)+2*b
visually, (b+1) is a factor of the polynomial but the machine refuse to recognise this, I tried /(b+1), collect, expand and simplify and all failed.
This is quite a frustration to new user who just want to get things done quickly!

Hello, everyone!
Given a polynomial:
f := x^2*y + 10*z*w + 2*a*t
I would like to know how many different variables appear in f. Is there a command I can use to do this?
My actual polynomial is more like:
f := x[1]^2*x[2] + x[127]*x[3] + ...
Any help would be appreciated!
Thank you very much, and happy holidays!
Best,
Susan

I am new to the Maple v.11 world and trying to figure out how to do things. I'm getting lost with the instructions in the help screens.
Here is the problem: Can somebody show me how to enter this into Maple.
Find the probability of an observation falling within one standard deviation of the mean. A Poisson distribution with [lambda]=16.
Two other questions are normal distribution with mean=20, and a gamma distribution with [alpha]=4 and [theta]=5.
I'm sure that if I can figure out one of the problems, I can figure out the others. Somebody please show me how to enter the problem

Hi I have data I want to fit it I do not know the model function I know only that the relation between X and Y is non-linear and there is six parameters I want to know their values from the fitting.can I do this using Maple or it is impossible.
this is Maple work sheet:

Download 7089_X0165.txtView file details
this is the input data:

Download 7089_Nonlinearfit.mwsView file details
Is it possible to execute an **fsolve()** for the equation as given below? I have not been able to get it to work thus far. Thank you for your support.
Excel cell formula:
=Maple("fsolve(2*(2*EllipticE(&1)-EllipticE(sin(beta),&1)-EllipticK(&1))+2*EllipticF(sin(beta),&1)=tan(beta)*sqrt(1-&1^2*sin(beta)^2),beta);",I14)

I have looked around and can't seem to find anything. Something simple that would provide the number of days eleapsed between two date/times. This comes in handy for radioactive source decay calculations.
Thanks,
GL

I just started using maple I want to count such thing:
( sum {from j=1 to k} ( x_j - b ) - sum{ from i=1 to n}( y_i - b) )^2
It's a part of longer equation. As a result I need a formula not a value.
It is possible to count it with a build-in maple command? I have problems with writing the sum. If not could someone give me a tip how to write a program?

Hi,
I need to find the domain and range for x=(1/5)*e^(y/2).
How do I do that in Maple?
Thanks!

Hello, I have this complicated and messy (complex) function, called ratio, of a variable f0. (Sorry the function is really long).
1) suppose I set f0 = 5.0e9, then evalf(ratio) gives 0.3832106695.
2) if I were to plot ratio via,
with(plots):
plotr := semilogplot(ratio,f0=5e9..1e12,color=black,numpoints=1000,axis[1] =
[tickmarks=[4,subticks=8]],axis[2] = [tickmarks=[4,subticks=5]],
view=[1.0e9..1.0e12,0.40..1.00]):
display(plotr);
then on the plot it shows that ratio > 0.40 at f0 = 5.0e9.
Could anyone help please? Thanks! The function is listed below,
ratio :=
0

Hi,
The Trainig video "Using Embedded Components with Maple 11" provides an example using a Button component, a Mathematical Expression component and a Plot component.
Since the training video uses Maple 11, the commands in the Button component to get a function entered in the Mathematical Expression component displayed in the Plot component are not applicable if one has Maple 10.
I have tried this example with Maple 10 using the SetProperty and GetProperty commands but cannot get this example to work.
The command programmed in the "Action when cliked" filed of the button is as follows:

I will have to use an example to highlight my problem, any help would be of great use,
Let us take the group {a[1],a[2],a[3]} with a[1]=[1,0,1,0], a[2]=[1,1,0,0], a[2]=[0,0,1,1]
now we have combinations of 2 such as a[1]+a[2]=[2,1,1,0], a[1]+a[3]=[1,0,2,1] and a[2]+a[3]=[1,1,1,1],
I want to make Maple realise that a[1]+a[2] and a[1]+a[3] are the same as they have the same values in the list even though the order is not the same.
from there I want to put them into seperate classes so I have b[1]={a[1]+a[2],a[1]+a[3]} and b[2]={a[2]+a[3]}
Been having a lot of trouble trying to do