MaplePrimes - Questions and Posts tagged with academic

over defined problem

farazhedayati — Wed, 16 May 2012 20:02:29 Z

Have to solve and ODE in the domain of [-infnity +infinity ] via specific analytical method but due to some restrictions it could not be solved. In order to solve it, I have separated the domain into [-infinity 0 ] and [0 infinity]. So, I have to add some boundary values at x=0 to the problem. Assuming the solution of the mentioned ODE in [-infinity 0 ] is g(x) and in [0 infinity] is f(x), I added the boundary values of f(0)=g(0)=a and f ' (0)=b and obtained f(x...

NO Solution for ode

samiyare — Wed, 09 May 2012 11:57:31 Z

i have the following ode

.7246228659*(diff(f(x), x, x, x))+f(x)*(diff(f(x), x, x))+.6666666666-.6666666666*(diff(f(x), x))^2

with boundary conditions

f(0) = 0, D(f)(0) = a, (D(f))(b) = 1 (b corresponds to infinity and we can assume it 4 or 10 such that the solution converge)

i know the the solutions exist up to a critical value of "a" that beyonds no solution exist. for example for the following ode the critical value is...

multiple solution for ode

samiyare — Tue, 08 May 2012 17:53:56 Z

considering the following ode

eq1 := .6740221708*(diff(f(x), x, x, x))+f(x)*(diff(f(x), x, x))+1-(diff(f(x), x))^2

i solve it by

sol := dsolve({eq1 = 0, f(0) = 0, D(f)(0) = -1.2, (D(f))(b) = 1}, numeric);

this give me one solution but i know that this ode have dual solutions. how can i found all solutions of ODE.

thanks for youe attention in advance

How to do simple linear regression in Maple T.A.?

sreid — Mon, 23 Apr 2012 18:01:43 Z

I decided to convert an old LR question to Maple 15 syntax and update my Maple T.A. questions. I have it working in Maple, but in MTA I get an error: "java.io.IOException: Maple computation error", I've eliminated lines until I found out the error is when I use Fit to solve for the equation. What am I doing wrong?

Thanks, Stephen

I define 8 x values, and calculate 8 y values with random residuals. Then I solve using least squares.

$x1=180;

Problem with type conversion (I think)

dscottoz — Mon, 23 Apr 2012 04:23:23 Z

Ok, I am not a very experienced user, but I am mystified by this. The essence of the problem is that when entering a range of values in an integration, I get a different answer if the range is given as 0..1 to if it is given as 0.0..1 or 0..1.0. Here is the program

### dgig
dgig := proc(psi, chi, lambda, t)
(psi/chi)^(lambda/2)*t^(lambda - 1)*exp(-(psi*t+chi/t)/2)/\
(2*BesselK(lambda,sqrt(chi*psi))):
end: ## End of dgig

solving pdes of the following form

dyson — Wed, 11 Apr 2012 13:17:30 Z

how can i solve pdes of the following form in maple

[tex] tc(t,x)\frac{\partial a(t,x)}{\partial t} - ta(t,x)\frac{\partial c(t,x)}{\partial t} = a(t,x)c(t,x) + t(a(t,x))^2 and be able to find both functions a(t,x) and b(t,x)

Tablet Handwriting App that works well with Maple?

Dakota — Thu, 05 Apr 2012 20:06:50 Z

I have an older tablet PC on which I recently used Windows Journal for handwriting and storing my lecture notes (on the swivel screen with a stylus). However, Windows Journal is very basic (doesn't interact with Maple or anything else other than pasting images into it) and has very limited drawing capabilities (rectangles, ellipses, and only horizontal lines).

What tablet PC apps do you recommend for handwriting, drawing, etc. that interact well with Maple

export out of Maple 16?

karamand — Wed, 04 Apr 2012 13:52:33 Z

Hi evryone.

Does anyone have experience on what is the best format to export an entire worksheet (code and graphics) out of Maple. I tried all different formats but none comes even close to being publication quality.

thanks a lot

Trial ZNO in Maple 16

Valery Cyboulko — Mon, 02 Apr 2012 08:18:08 Z

2012.zip

Ukraine. External independent evaluation (ZNO) in 2012. Trial in Maple 16.

html 3-interactive in Ukrainian: zno.zip

link: http://webmath.narod.ru/zno/pro.html

How to find roots of complex number

french_fries — Fri, 30 Mar 2012 12:34:24 Z

So the question is to find complex number W from :

but I want the answer in polar form using e (Euler's number).

The question is specific to ask for the complex number W that lying in the first quadrant and having the largest possible real part. I calculated and got :

How Can I use Maple to caculate Clifford Algebra??

hustfzt — Mon, 26 Mar 2012 13:14:44 Z

how can I caculate the Clifford Algebra in using symbolic expression?

Routh Table for a polynonial equations

jotieno — Sat, 10 Mar 2012 11:50:34 Z

Hi everyone, I am getting this error message in maple can i get any help

Error, (in DynamicSystems:-RouthTable:-RouthTable) the polynomial must not contain complex values

densityplot as background

anthei — Tue, 06 Mar 2012 17:11:26 Z

I have a problem with animations using a density plot as background.

The density plot covers the animation.

Here is an example:

plt:=densityplot(-(x^2+y^2),x=-1..1,y=-1..1);
animate(plot,[[sin(r)*cos(t),sin(r)*sin(t),t=0..2*Pi],thickness=10],r=0..Pi,background=plt);

Can this be solved?

Best regards

anthei

Plot functions numerically in three dimension

amrramadaneg — Thu, 01 Mar 2012 09:54:32 Z

Hi,

If I have a function defined as

F[i]:=x[i]^2 +x[i]*y[i]+y[i]^2 where x[i]:= (i-1)0.1 and y[i]:=(i-1)0.2 , i=1..100

matrix inside matrix

amrramadaneg — Sun, 19 Feb 2012 10:50:14 Z

Hi, if i have a matrix 4x4 as

A=[I Y -X aX

bY Z o o

X^T O^T 0 0

o^T O^T 0 q ]