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how to solve a symbolic matrix 11x11? memory alloc...

April 27 2010
0 27

I have a symbolic matrix (11x11) it is sparsely populated with components on the diagonal and 2 places either side.  When I have tried to calculate the [standar operations > nverse] (on a PC with Raid 0 and 4 Gb) Maple 12 stops running at 1883 Mb and complains about 'memory allocation?

Q1: how do I (inexperienced maple user) increase memory allocation?

Q2: when I tried to run a 5x5 matrix as a test a matrix wasn't returned, only a list of letters?

April 27 2010
0 5

Hi everybody,

help in solving 4th order ODE with boundary condit...

April 27 2010
0 9

hi!

I am trying to solve an ODE for w(x);

E - a parameter
MI - a parameter
w(x) - Transverse deflection
q(x) - Transverse force on the beam with respect to x
G - a parameter
A - a parameter
ap - a parameter
si - a parameter
mysol1 - differential equation to be solved with boundary conditions (bc1,bc2,bc3 and bc4) applied

April 27 2010
0 16

Dear all:

An multivariate inequality...

April 27 2010
0 16

Hi to all,

I need to verify an multivariate equality in maple, here it goes:

Nr := 3 - cos(x - y) - cos( z - x) - cos(y - z);

Dr := (sin(x/2))^2 +  (sin(y/2))^2 + (sin(z/2))^2;

assume(x>0, x<Pi); assume(y>0,y<Pi); assume(z>0,z<Pi);

eqn := Nr/Dr;

I need to check whether eqn <= 6. I have tried

is(eqn > 6)  and is(eqn <=6) and both give FAIL as output. But if I change the denominator, Dr say Dr := Dr + 6;

Get Maple To Check Diff Eqn...

April 27 2010
0 2

ok so i have the differnetial equation

$\lambda^{2} (\frac{dx}{dt})^{2} = (cos{ \alpha} - x)(cos{ \beta} - x)$

where $x = cos{ \theta}$

and the solution is

$x = cos{ \alpha} sin^{2}{\frac{t}{2 \lambda}} + cos{ \beta} cos^{2}{\frac{t}{2 \lambda}}$

please show you're working cos that's where im getting lost

now i want to use maple to show this is the solution to the eqn.

how do i do this???

eps figures without external frames...

April 27 2010
0 2

How do I can generate eps figure from my maple calculation, in which expernal rectangular frame (solid lines) does not appear. I generate successfully the eps but I cannot remove the frame.

simplification of expressions involving wedge prod...

April 27 2010
0 4

Let us say that we have a code shown below:

restart:
with(DifferentialGeometry):
DGsetup([x,y],M):
e[1]:=A*ExteriorDerivative(x);
e[2]:=A*ExteriorDerivative(y);
simplify(e[1] &wedge e[1]+e[1] &wedge e[2]);

the output of this code is

Adding dependencies to a defined variable...

April 27 2010
0 6

Can we define dependencies of a variable after using the variable? For example, let us take,

f:=2*T+x^2;

Here, T has no dependencies. What should we do to make it dependent of x and y without redefining the whole thing as f:=2*T(x,y)+x^2;

and, can we do this for a whole matrix or vector?

Piecewise coding for Acceleration question...

April 27 2010
0 2

Hello,

I have a simple acceleration/position problem that I can't figure out how to use piecewise to put into Maple --- can anyone assist?

Integral...

April 27 2010
0 2

ok just trying to integrat something here

-[(tan(theta)) dtheta]/[sec(theta) (2cos(theta)-1)^(0.5) (1-cos(theta))] = (sqrt(Mgh/A)) t

and get to sec(theta) = 1 + sech (sqrt(Mgh/A)) t

maple default dirs...

April 27 2010
0 2
Hello, can anybody explain-me (or give-me a link about) the Maple default directory configuration. Specially the signification and difference between the terms: currentdir homedir (in kernelopts) UserDirectory (in maplesys.ini file) Thank-you

Cool...

April 27 2010
0 17

In 90's Maple was cool. Such things as fi, od, op, nops etc. were cool. They attracted many geeks.

LinearAlgebra:-LA_Main:-ReducedRowEchelonForm, end if, end do, and even ArrayNumElems  are not cool. That may be the reason, together with new Java interface (extremely not cool) why Maple stopped being cool in 2000's.

Alec

Groups built-ins...

April 27 2010
0 3

Hi I'm looking for a way to represent groups in Maple.  I have looked at the groups package, and still don't know how to deal with cyclic groups, or how to deal with elements of a group.  Note, I think I know how to do these things for permutation groups but what if I want to do it with a different group, like Z3. I really appreciate any help you can give me, thank you.

Differentiating output of dsolve...

April 27 2010
0 8

Good Day!

I numerically solved a system of ODEs with dsolve for the functions p(x) and q(x) over the domain x=[-1,+1].  Boundary conditions are specified at x=-1 and x=+1.  The output is a listprocedure.

I want to determine the n-th derivatives of p(x) and q(x) at x=0.  Alternatively, I want the power series representation of p(x) and q(x) about x=0.

I would appreciate any advice on how to use Maple 10 to accomplish this.

Thanks.

Glenn

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