I want to solve a series of differential equations, and then plot the results, but I'm having a bit of trouble with evaluating them using dsolve. My code is:

-----------------------------------

restart;

c:=1;
mu:=0.3;
m1:=1-mu;
m2:=mu;
x1:=mu;
x2:=mu-1;
omega1:=1/2(mu(1-mu)-3);
omega:=1+omega1/c^2;
r1:=sqrt((x(t)-x1)^2+y(t)^2);
r2:=sqrt((x(t)-x2)^2+y(t)^2);
A:=diff(y(t),t)*x(t)-diff(x(t),t)*y(t);
rsquared:=x(t)^2+y(t)^2;

Hi,

I'm trying to solve a nonlinear diff. equation numerically using (dsolve) but it gives me an

Error, (in dsolve/numeric/bvp) initial Newton iteration is not converging

my code is:

ode:= diff(f(x),x,x,x)+f(x)*diff(f(x),x,x)+B(1-(diff(f(x),x))^2=0   # f'''+f*f''+B(1-(f')2)=0

bcs:= f(0)=0,diff(f(x),x)(0)=0,diff(f(x),x)(5)=1                            # f(0)=0, f'(0)=0,f'(5)=1

Hi,

I'm using solve and I want all the solutions within a certain value, but then within my procedure i'm looking to get a list of just the solutions by using the AllSolutions=true command I get:

a:=evalf(solve([sin(x) = 0.5, 0 < x, x < 10], x, AllSolutions=true,Explicit=true));
 {x = 0.5235987758}, {x = 6.806784084}, {x = 2.617993879}, {x = 8.901179187}

I then need to put them into a list [0.5235987758, 6.806784084,...]

so i either...

Is there a way to make the y-axis logarithmic using DEplot?

So there is a maximum number of conditions that one can set... good to know!

I tried your solution, and it does work. I'll just have to determine the values of my b1 and b2 parameters with a little programming.

Thank you very much!

Hello,

I am trying to solve the following differential coupled system :

DN:=diff(N(x),x)=a/4*(x+8*(sin(F(x)))^2/x)*N(x)*diff(F(x),x)^2;

Du:=diff(u(x),x)=a/8*((x^2+8*(sin(F(x)))^2)*(1-u(x)/x)*diff(F(x),x)^2+2*(sin(F(x)))^2+4*(sin(F(x)))^4/x^2);

DDF:=diff(F(x),x$2)=1/(N(x)*(1-u(x)/x)*(x^2+8*(sin(F(x)))^2))*(-(x^2+8*(sin(F(x)))^2)*diff(N(x),x)*(1-u(x)/x)*diff(F(x),x)+(1+4*(sin(F(x)))^2/x^2+4*(1-u(x)/x)*diff(F(x),x)^2)*N(x)*sin(2*F(x...

When I am trying to write the data of the following program in a datafile

restart

with(plots)

eq := (diff(G(eta), `$`(eta, 2)))/Pr-2*n*b*eta*G(eta)+(a+(1/2)*b*eta*eta)*(diff(G(eta), eta))

I am of interest about using StateSpace(de, invars

"I" is reserved for square root of -1.  I don't use complex numbers and want to use "I" in my equations.  How do I go about doing this?  I tried to unprotect it with a number of variations of quoting "I".

I'm using document mode with Maple 13 on Apple.

Thanks for your help.

You would have thought I'd have learnt to make sure I've saved my work by now.

I've spent the last 4 hours or so working on a worksheet on Maple, without saving it once (I know, I know). It started acting slow-- by which I mean it was talking a while to actually type things, as opposed to running calculations-- and then the screen suddenly went grey, froze, and now my cursor turns into an hourglass when I mouseover the window.

It's been this way for the past 10 minutes.

Hi

I am attempting to do a least squares regression with two variable (HK and S) generating my curve.  The equations are extremely tempermental and won't allow maple to solve them using normal methods, so I'm resorting to numerical methods to minimize the least squares.

I am attempting to create a dataset that I can search for the minimum of "k" and have it tell me what "i" and "j" values I used to get there.  The code below is the basic idea, the...

mem2.mw

Although i have defined K5 as a constant before solving the equations , maple returns an error message saying that

"Error, (in fsolve) k5 is in the equation, and is not solved for"

And i am alos trying t find the roots of the equations in a certain range as specified above.

HW_6.5.mw

I just want to know how i could label the expressions that are generated by executing the loop,

like A1 = .....

A2= .....

If you see the file above , the for loop gives out several expressions in terms of c and t , the equations generated are correct but i want to give each expression a label like A1,A2,A3 when the output is generated

Hello to all,

I have some data and i want to create a 3d columngraph from them but i can't  find a relative command in Maple.. I want something like the "AreaChart" command without the lines connecting the points..One solution is the Pointplot 3d, but if there is a way to do it with columns is much more preferable..!

Thanx!