Hi,

I have a question concerning PDEs with initial conditions. The general solution to my PDE is achieved by:

PDE:=diff(p(x,y,t),t)=(x-1)*k1*p(x,y,t)+(y-x)*k2*diff(p(x,y,t),x)+
(1-y)*k3*diff(p(x,y,t),y);

ans:=pdsolve(PDE);

However, I would like to achieve the solution for this PDE with the initial condition p(x,y,0)=x^n. I have read all the information I could find under the help menu. If there is no way to define the initial conditions directly in the pdsolve function, then how do I get the solution of the PDE with my initial conditions given the general solution achieved by pdsolve?

I see 'flying' parenthesis in Maple 10 on my Mac iBook G4 with OSX 10.4. An example can be seen here: http://www.fys.ku.dk/~niclasen/parenthesis.pdf It's just a standard installation of Maple 10 without any further configuration. The font is "Times New Roman" in the line with blue output. Does anyone have the same problem? And how can I solve it? Thanks! John.

Being new to Maple I can't figure out how to do a 3d plot of a function w/ 3 variables. I want to be able to also do a space curve to show the constraints. Anyway, here's the function. f := proc (x1, x2) options operator, arrow; (339+(-1)*0.1e-1*x1+(-1)*0.3e-2*x2)*x1+(399+(-1)*0.4e-2*x1+(-1)*0.1e-1*x2)*x2-400000-195*x1-225*x2 end proc I am not able to show it. Thanks, Bill

To obtain the differentation of a matrix use the command map(f->diff(f,x),M);

We've encountered an interesting problem, outlined below: restart; with(student): f:= x->x; #anything, just so long as f is a function. b:= leftsum( f, x=1..2, 6); # the range and number of rectangles aren't really important. b; c:= evalf(b); c; As you will see, b does not throw an error, and yet c does. The recursion error seems to be an untrappable error (i.e. it kicks you immediately out of all try-catch loops and back to the top level). It immediately breaks out of any function or procedure we throw at it. After analysis with printlevel := 100, it seems that the error arises in how evalf calculates the Sum in evalf/Sum1; evalf uses the variable r and adds each piece of the sum to r one by one.

Hi everyone! I have a really important question about maple: while using maple to solve my problem (PDE, a few threads before), I did pay attention to the fact the maple is giving different values for 2 equal expressions! for example: assume we want to express sin(d) as a function (only) of tan(d). It's easy to see that 1/tan^2(d) is equal to [1/sin^2(d)]-1. therefore: 1/sin^2(d)=[tan^2(d)+1]/tan^2(d) from this we have immediately: sin(d)=tan(d)/sqrt(tan^2(d)+1) now, when I put sin(d) in my solution, I didn't get the same answer as I got with the expression to sin(d) above!!! Why is this happenning? and what can I do to get ovet it? (I really need to use the expression above instead of sin(d))

Hi I'm new to Maple. I've had it for years and am just now getting into it. My problem is how to simultaneously solve a set of equations that feature some nonlinear terms. This isn't a set ODE's. They are algebraic equations with nonlinear integral terms like, I2:=int(cos(Pi/2/Theta*e)^4.545*sin(e)*cos(e-phi),e=theta..Theta); There are 3 variables to solve for after the variable theta has been specified. Equation 1 has the nonlinear terms and the other 2 equations are linear. I can post all 3 equations if someone can help. I saw an example on this site for a vibration problem solved with the Runge-Kutta method but the dsolve command was used and mine aren't ODE's. I have version 7.

A common complaint among MaplePrimes users is that when you close your web browser, you have to log into the site again. Your login information is not remembered between browser sessions. I just posted an update to the site that fixes that problem. You can now log in and return to the site after closing your browser and you will still be logged in. If you return to the site and don't appear to be logged in, please check that the URL in your address bar is www.mapleprimes.com. If you are using an old bookmark that heads to beta.mapleprimes.com, your login information will not be remembered. Just change your bookmark and the problem will be solved.

Hello, When i used command 'Eigenvector' to find eigenvalues and eigenvectors of mechanic system like this : (wfem,modvecs) := Eigenvectors(mm,kk); # mm,kk are mass and stiffness matrices of system . It returns a complex vector and matrix. But when use : (modvecs,wfe):=Matlab[eig](mm,kk,eigenvectors=true); It returns a float matrix and vector, i try using Matlab to solve and it also retrurns a result similar to Matlab[eig]. The important thing is two results of two command 'Eigenvector' and Matlab[eig] are difference. After that, I use 'Map' command to take real part of result(in 'Eigenvector'),but it works only with 'map' ,and 'Map' doesn`t.

Goodday, Ladies and Gents, My Prof. has asked us to prepare text files containing pi, e, sqrt(2) and the golden mean to 100,000 places for class next week. Easy enough ((evalf[200])(sqrt(2)),(evalf[200])(exp(1)),evalf[200](Pi) - excepting for golden mean. Is there a quick way to do it? Thanks. Evyn

Dear all, I have query with 9X9 matrix of MAss and Stifffness ; So please kindly help me how to solve it. Thx,Rgds PNChary

The episode is called Surviving Math education and the guest is Jack Weiner, author of the book, and e-book the Mathematics Survival Kit.

While trying to install Maple 10(Single User), after the initial install everywhere finishes, during the screen with the Maple 10 Spash I get an "This Application has Unexpectedly Quit" Invocation of this Java Application has caused an InvocationTargetException. This application will now exit. (LAX) Details are: java.lang.NullPointerException at ZeroGga.a(DashoA8113) at ZeroGga.a(DashoA8113) at ZeroGfs.a(DashoA8113) at com.zerog.ia.installer.AAMgr.a(DashoA8113) at com.zerog.ia.installer.Main.d(DashoA8113) at com.zerog.ia.installer.Main.a(DashoA8113) at com.zerog.ia.installer.Main.main(DashoA8113)

I am looking for a job. Here is my vita.

I wonder why the "asympt" doesn't expand the BesselI right!! Is there another way to exapnd it without using "asympt"