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I have an ODE to solve that looks like this: 

((diff(R(r), r, r, r, r))*r^4+3*(diff(R(r), r))*r-3*(diff(R(r), r, r))*r^2+2*(diff(R(r), r, r, r))*r^3-3*R(r)+4*R(r)*n+2*R(r)*n^2-4*(diff(R(r), r))*r*n+2*(diff(R(r), r))*r*n^2+4*(diff(R(r), r, r))*r^2*n-2*(diff(R(r), r, r))*r^2*n^2-4*R(r)*n^3+R(r)*n^4)/r^4 = (-108-1362*n+2122*n^2+2019*n^3-3032*n^4+401*n^7+1192*n^6-1033*n^5-25*n^9+6*n^10-180*n^8-4128*r^(n+3)*n^3+2304*r^(n+3)*n-576*r^(n+5)*n-760*n^6*r+575*n^5*r-244*n^7*r-2108*n^3*r-11616*r^(n+3...

Maple experts, please help...

I am facing hard time with ODE functions...:(
I would like to know if there is any command or algorith that could actually clear the solution of "dsolve" command,what I mean... let's say I have ODE function of one indeterminate "y(t)" and its general solution is obtained from dsolve command by setting certain initial conditions. Now, I need to remove that general solution from the system memory so as on next call of ODE function the "y(t...

I am evaluating a difficult integral of an oscillating function.

f:=k->evalhf(piecewise(k=0,1,k>0,cos(k*(dz))*BK0(k*rho1)/BK0(k*a)));

evalf(Int(f, kmin..kmax, method = _d01akc,epsilon=eps,maxintervals=1000000))

with dz>0 and possibly very large
kmin is Pi/(2*dz)
the number of cycles is nc = ceil((1/2)*kl*dz/Pi) with kl = 91.563
kmax=  kmin+nc*2*Pi/dz

Each evaluation of this integral using a call to the NAG routine (_d01akc ) eats up 

Noticed that after simplify memory remains in some internal caches. How to free it after simplification done?

Could i manually reset status bar (i.e. memory and time values)? restart; doesn't help.

Hi everyone,

I am importing an .m file from MATLAB to Maple using the command: FromMFile(). The .m file uses a set of huge symbolic matrices with an output of a huge symbolic vector of 36 by 1. Each element of this vecot is supposed to form a second-order differential /or algebraic equation that I am planning to solve using the Maple DAE toolbox.

The problem I have is that while I execute the worksheet, Maple only evaluates the...

Call EvalMapleStatement from c dll.

expression always has form like "F(0.4, 0.7, 0.9);" i.e. maple defined function called. All i need it's value without any kind of caching. But memory usage dramatically grows. Help to overcome it!

Tried already EvalMapleStatement ("forget(F);") - do not work. I'm out of ideas what maple also caches. F itself is complicated enought. And not known a priori. How to clear all caches of other functions that f might call?

I have been running up against a memory limitation when running maple.java v15 from a Linux Ubuntu workstation.  The memory indicator in Maple gets up to 39.36M but will not go above that.  After I reach this limit I am still able to perform further computations but Maple gets slow and eventually crashes.  Here is one of the lines from the error message:

Exception in thread "AWT-EventQueue-0" java.lang.OutOfMemoryError: GC overhead limit exceeded

Dear all, 

I'm using the maple command in MacOS. While doing some computations, Maple periodically prints out the GC information such as:

memory used=444.9MB, alloc=184.7MB, time=7.75

I'm wondering how to tell Maple to only suppress those information? I also noticed that maple has an option -q to suppress such information, however, that option is too powerful which suppress other useful pretty printings too, which is not what i want.

Thanks,

Hello there,

Im running a fairly big algorithmn with a lot of loops , the memory counter is showing 237.89M and its been running for a long time.

The memory usage has been constant for the last 40min, the time counter still going, and the status bar says 'evaluating'

Is the maple still running fine or has maple's or my computer's limit been reached?

task manager is showing a memory usage of 40% and CPU 12%

Hi there,

I am plotting flow diagrams of a 2-dimensional system of autonomous 1st order ODEs x'=f(x). I have some free parameters in there, and am analyzing how the flow changes qualitatively when varying these.

To visualise my results I want to do some animations. The Explore command doesn't seem to like the DEplot command, or I am doing something wrong. So I use the animate command, which works fine, although I can only vary a single parameter with it.

I'm trying to plot some expressions the contain infinite summations.  On some of them it is working, but is really slow, and on others Maple keeps thinking and consuming more memory until it reaches just under 2 gb, by which time it is pretty much hung.

Is there a way make Maple not work so hard in evaluating the summations?

I am using finite element analysis and have 47008 nodes, so require a 47008 by 47008 matrix.  I wish to create the matrix using a procedure and using if statements to fill in the matrix with the equations (mostly repeating and every element in each row is 0 excpet for 4 or 5).  Anyway, I have tested my solution method on a much smalller matrix and know it works.  My question is if there is a way to create such a large matrix without getting a memory error, and...

I am a retired physicist persuing independent mathematical research and don't fit into any of Maplesoft's four user catagories.

I am trying to develop a new finite element method for incompressible fluid dynamics in 3D. I must derive four vector functions which are mapped into the 84 degrees-of-freedom of the finite element. I expand each of the four functions in terms of multinomials with 192 unknown coefficients to be determined. I apply essential constraints to each...

Some time after I start using Maple 13 I notice that the scroll bar on the right is choppy. I also notice similar issues when I plot a 2D graph with the plot and the scroll bar becoming choppy. Could this be a computer memory problem? I am using Maple 13 on Windows XP with 1.25GB RAM. Thanks in advance !!