Hey everybody I am trying to get maple to do some partial differention for me. 

Where 

I have PDEtools on but, it doesnt return an expression correctly. It's I think the problem is because Ψ is a function of (x,y) and f is a function of η and η is a function of x and y . U and ν are constants. v_x and v_y are the x and y velocites. 

What I would like the program to return when I write 

is something along the lines of 

could someone give me a hand on this. I would really apperciate it. 

Best Regards, 

Kyle 

Hi Guys,

I am trying to do the following and here is the issue:

> System*Transfer*Functions;
Power Stage Transfer Function:
> He := s^2/`ωn`^2+s/(`ωn`*Qn)+1;
>
Compensation Netwrok Transfer Function:
> Av := gm*(1+s/`ωcz1`)(1+s/`ωcz2`)/((Cc+Rc)*s*(1+s/`ωcp`));

>
Loop Transfer Function:
> Loop := Vref*RL*(1+s/`ωesr`)*Av/(Vout*Ri*(1+s/`ωp1`)*He);

> sys3 := TransferFunction(Loop);

Warning, transfer-function(s) are not rational-polynomial(s) in s

I want to do the TF and Bode Plot for this complex system... 

I am having trouble getting a certain Maple worksheet to execute.  Using both Maple17 (I think it is 17.02) installed on two separate PC's at home (XP), and using Maple15 via Citrix from a server maintained by my employer, I get a long error message.  It starts:    "Kernel connection has been lost.  You should save this worksheet and restart Maple.  Executing commands in Maple requires a connection to the Maple kernel.  Firewalls have been known to cause problems with kernel connections in Maple.".  If anyone wants, I can add the entire error message to this question. I don't think I actually have a firewall at home, and this error message doesn't seem to explain why my local copy of Maple is having trouble.

I think I updated my home copy of Maple to Maple 17.02 after I started writing the worksheet and before this problem appeared, so there may be an issue with Maple 17.02.  But this would not seem to explain the trouble I have executing the worksheet using Maple15 via Citrix.

I have uploaded the file.  I removed the output to make it a reasonable length.  I created a "toy" file that plots x^2 from x = 1 to x = 4, and does nothing else, and it works just fine.  I apologize for the length of the file I uploaded, but I don't know exactly what is causing  the error.

NewPicture.mw

GS

I copied and pasted this from the example page and I have to get this same graph for an assignment

im using maple 17

when i hit enter the return was

                       (1)

Hi,

I'm having some difficulty in figureing our how to store the results of an fsolve computation in an indexed variable that I can access subsequently to perform plots and do other calculations.  I have a do loop that, for every increment, has fsolve calculate five variable  (x,y,z.. )from a set of equations that have been entered.  It does the calculations just fine.  What I can't seem to do is set up an array variable (or other indexed variable like a vector) so that with every increment of the loop the values that fsolve generates for x, y, z  ect. can be stored.  That just doesn't seem to work, what am I getting wrong? Any help would be most appreciated.

Al Stiegman

Hi,

I need help formulating a biased coin toss.

I want to toss a coin 0 being heads and 1 being tails with probabilty 0.495 of getting heads, how do I show whether heads or tails wins??

Thanks

I tried

solve(log[3+sqrt(8)](3-x)-log[17-6*sqrt(8)](4*x^2+20*x+25)+log[3-sqrt(8)](x^2+x-2)>=0,x);

and got 

Warning, solutions may have been lost

RealRange(-infinity,Open(-5/2)), RealRange(Open(-5/2),Open(-2)), RealRange(Open(1),Open(3))

How can I get the exact the solution?

Good morning sir.

I request your kind support to the above cited query.

With thanks & Regards

M.Anand

Assistant Professor in Mathematics

SR International Institute of Technology,

Hyderabad, Andhra Pradesh, INDIA.

Good morning sir.

I request your kind support to the above cited question.

With thanks & Regards

M.Anand

Assistant Professor in Mathematics

SR International Institute of Technology,

Hyderabad, Andhra Pradesh, INDIA.

Dear All,

please help me with my problem. i have quite a big program all parts of which are distributed in the several code edit regions and in the main text. i'd like to find all occurenses of gven text in all open documents including code edit regions. i know how to do it manually by openening each code edit regiong and pressing Ctrl-F. however it is very time consuming and defocuses me apart from my main tasks. i'd prefer to use some combinations of 'hot keys' on the keybord or one or two mouse clicks as for example in MS Visual Studio.  

4(x-7) =6

(2x+3)(2x^2-_5x-3)=0

Kepler_Gravitatio.mw

Download Kepler_Gravitatio.mw

Now, don't worry about the upper part ending with the first plot, this was just for startup.

I tried to emulate an external moment of force which acts tangential on a particle of unit mass. After one year = 365,25 days I switch of the force which was done via heaviside function.

I'm wondering about the results. Shouldn't the function r(t) be constant for t>365.25 since D(r)(365.25) and the also the second derivative vanishes. Unfortunately this is not represented by the results of the ode for t>365,25

What problems do occur here and how can I omit them?

BTW: how do I derive the numeric function rt or rpt with respect to t

e.g. D(rpt)(10) does not work

The question of how to do matrix operations over a finite field with p^k elements k>1 was raised in this forum in April 27 2010. I wonder if there has been any progress since then for recent versions of Maple.

I am expecially interested in finding the rank of a matrix over a field of order p^k, k > 1.

Hello all, 

During my last attempt to solve ODE system (autonomous system which includes 3 first order diff. equations) with initial conditions, Maple had performed the solution which includes d_z1 parameter as follows below (I present the solution of one of the equations):

S(t)=S(0)∫(QN_z1+A)d_z1, where integral ∫ is defined integral from 0 to t, S(0) is the initial value of S, Q, N and A are the parameters. I would like to ask, what does it mean _z1 and d_z1? Why if the ODE system is only time dependent, I received the integral with other differential, that is d_z1? Does it mean that the integral can't be evaluated or maybe something else?

Thanks in advance,

Dmitry

Hello,

I am trying to find all the roots of this equation and to solve it:

exp(x)*cos(x)+1=0

but doing fsolve(exp(x)*cos(x)+1,x=0..10) it gives me only one solution, while I know that there is more than one solution. How can I do in order to solve this equation and have all the roots in the range 0..10?

I really can't figure it out!

Thank you

Giulia