Hi everyone, here we are again with more serius issues this time.

I have a system of DE to solve. My system is made of coupled 3 PDE`s with 1 ODE. My problem is that the computation is aborted due failure at memory allocation, here is the message:

"Error, (in factor/nexteval) Cannot Allocate Memory (size=151060480)"

I`ve checked the kernelopts about datalimit and its already infinity. My computer is a Turion x2 with 4Gb of Ram (system...

Hello,

I want to evaluate an integral over the Dirac function with basically the following assignments. (I had some troubles parsing here...) Then I want to plot function rho(epsilon). What I get is just an empty graph with nothing displayed although test has only values in the range -3...3. I am pretty new to maple and don't know how to compute this in another way.

> test(x,y,z) := .2686733768*x^2+.2686733768*z^2-.2178281566+.2686733768*y^2+(-1)*1.000000000*sqrt...

Hello,

I have this relatively simple 4 equations which I am trying to solve simultaneously. But for some reason Maple just returns a pair of empty square brackets as solutions. "[ ]" like this.

I have uploaded the Maple Worksheet for your convenience. It would be very helpful if anyone can take a look at it and point out out the problem. Thank you.

Simultaneous_Eq.mw

I tried to find out whether the expression

g1:=2*mu*(phi+ln(mu/(exp(phi)*sigma2-sigma2+mu)))/((-sigma2+mu)*phi)+mu*(1/(exp(phi)*sigma2-sigma2+mu)-mu/(exp(phi)*sigma2-sigma2+mu)^2)*(exp(phi)*sigma2-sigma2+mu)/((-sigma2+mu)*phi)-mu^2*(phi+ln(mu/(exp(phi)*sigma2-sigma2+mu)))/((-sigma2+mu)^2*phi);

is positive under the given assumptions:

         
is(signum(g1)=1) assuming mu>0, sigma2>0, phi>0, sigma2<>mu;

I need to use the flexible beam in my model. I want to know if the component's correctness can be guaranteed, but I can't find any correlative documents or thesis, only find an article titled "Dymola – Flexible Bodies library". Is the flexible beam in maplesim similar to this? based on the modelica library? applied the finite element method? Some detailed information is very helpful.

Hi

I have a little problem, I tried to find out the Temperature of the Electrons in a Plasma,

the cross section name is sigma and I'm working with noble gases and there Threshold energies.

In the end I wand to find out  T_e but there comes only "Warning, solutions may have been lost"

Can anyone help me please?

Thank you very much

greetings from munich

Hi

I want to solve this

2010.pdf 

Hi,

I'm dealing with a complicated expression:

exp((1/6)*kappa*R^2-0.5000000000e-1/R)*sqrt(x)-1+(1/2)*kappa*exp((1/6)*kappa*R^2-0.5000000000e-1/R)/(sqrt(x)*(1+coth(exp((1/6)*kappa*R^2-0.5000000000e-1/R)*sqrt(x))))-(1/6)*kappa*(exp((1/6)*kappa*R^2-0.5000000000e-1/R))^2+0.5000000000e-1/exp((1/6)*kappa*R^2-0.5000000000e-1/R) = 0.

I want to plot various graphs of kappa vs x for different values of R on one axis. How is this possible in Maple?...

Is there a possiblity to create custom multibody components with the custom component template? Is there another template available for this purpose, or do you propose another solution?

Thanks a lot,

Bernd

Can anyone help me convert this outdated maple code into something current? Particularity I need help finding the equivalent command to "stats:-empirical" as I can't even find documentation for it.

with(stats): with(linalg): with(StringTools):

P1:=matrix([[.6,.3,.1],[.4,.5,.1],[.3,.4,.3]]);

j:=1:  res:="S":

for i to 50 do  

    j:=random[empirical[op(convert(row(P1,j),list))]](): 

I appreciate that maple can solve equations so quickly, but i would like to solve the equation myself and only use the basic features of maple so that I can practice the theory. For example:

for the differential equation y'' + 3y' + 2y = 0 

I would like to assume y = ce^rt then plug it in and get something like

c*(r^2*e^rt + 3r*e^rt + 2e^rt) = 0

maple runs into problems regarding:

-whether the parameters are functions or constants

Download problemexample.mw

Hello Maple wizards,

After reading the mapleprimes post http://www.mapleprimes.com/posts/36097-Add-Map-And-Seq on the hidden complexities of using thread-safe versions of add (Threads:-Add), I have been struggling to correct a problem similar to the "escaped k" problem described by Joel Riel...

I have a family of functions characterized by

f:=x^2+b*x+b*3;

I plotted some of them:

graph1:=x->subs(b=0,f):
graph2:=x->subs(b=2,f):
graph3:=x->subs(b=4,f):
plot([graph1(x),graph2(x),graph3(x)],x=-10..3,y=-5..15);

And now I want to draw a line through all maxima into the same diagram. The maxima have the coordinates (-1/2*b | -1/4*b^2+3*b). I managed to create a pointplot:

The help page mentions that filledregions=true, that regions defined by curves are filled with different colors

implicitplot({y = x^2, y = x+5}, x = -10 .. 10, y = -10 .. 10, numpoints = 5000, filledregions = true)

What I expected was that the region between the line and the curve would be a different colored region.

Hi friends,

I am running an application which consumes big memory (~2GB); and in the middle of calculation I got this error:

Kernel connection lost... and the message is:

Execution stopped: Memory allocation failed! Please see ?alloc for more details...

Please let me know how I can increase memory alocation capacity of maple (version: Maple 13)