I recently migrated to CentOS 5.2 Gnome.  I found that I often encounter loss of keyboard control.  Maple reacts well to my mouse, but to nothing from my keyboard.

I don't know how to reproduce the phenomenon, but it often happens when I switch back from another desktop workspace.

I found that when I open a new document and back, the keyboard control will return.  What's the problem?  Anyone else encountered the same problem?  How can I solve?

Thanks!

I suspect this phenomenon is related to my topic on hanging with right click on selected text, but it is more general.

I have an execution group (in a standard worksheet in worksheet mode with 2D input) with about 65 lines (when comment lines are included) and 30 lines (when comment lines are removed) . It was taking a very long time to compute after each time I changed anything in the group, but computed very quickly thereafter if I changed nothing. After some experimenting, I discovered the following phenomenon.

For one (and only one) execution group (on a worksheet with many execution groups, both before and afterwards) which was modified by a student but which looks perfectly fine, a right click on any selected text causes Maple to hang (before any context menu appears). When I look at the mserver.exe process on Task Manager, it continues to use 99% of the CPU and keeps increasing its memory use.

Maple 11 - I'm trying to implement the explicit formulas for the three cubic solutions. I tried typing them in explicitly from other sources to no avail, for some reason or the other. Right now I'm currently using: solone, soltwo, solthree := solve(a*x^3 + b*x^2 + c*x + d): solone:=unapply(solone,a,b,c,d); soltwo:=unapply(soltwo,a,b,c,d); solthree:=unapply(solthree,a,b,c,d); The only problem is that, these solutions degenerate when the descriminant is equal to zero, for example:

  Hello,

 

 I have recently started the following error with maple on fedora 10 when I execute the classic worksheet with maple -cw or xmaple -cw I get the following error

 

maple -cw

*** glibc detected *** /home/EUIX/Programs/maple12/bin.IBM_INTEL_LINUX/maplew: free(): invalid next size (fast): 0x09af87a0 ***

======= Backtrace: =========

/lib/libc.so.6[0x7a13a4]

/lib/libc.so.6(cfree+0x96)[0x7a3356]

We are trying to create an animation of arrows, where we calculate the vertices of the arrow in a procedure.  We are receiving the error:

Error, (in peak_slow) cannot determine if this expression is true or false: t < -.4506938557
 

where the animate command is trying to evaluate our procedure instead of calculating the value.  The procedure is

I gave Maple the command

> ?fft 

to see how to do the fast fourier transform in Maple, and I what I got was a page that told me to use the commands:

> with(Matlab)

>v:=<1,2,3,2,3,4>

>Matlab[fft](v)

 

Why is maple using matlab ??

Can the size (width, length) of a 2D plot be specified programmatically? In particular, when a document is re-executed, I would like the graph outputs of plot(...) to be automatically sized to pre-defined values, for example to fit a full page. Right now, I am having to re-size each of my plots manually. For creating a report with many graphs, this is annoying to do and leads to plots that are not always exactly the same size.

I am thinking of the equivalent of ...

> plot(x^2,x=0..2,[width=6in,height=8in])

or ...

Does any way exist to bind keystrokes to menu commands? In particular, I frequently use sub and superscripts in text (I'm doing lots of chemical formula). That I have to search to a sub-sub-menu level to make these changes for individual characters is constantly annoying. Binding specific keystrokes (ctrl-underscore and ctrl-plus for example) to change character styles would be most useful in this case.

If this is not possible to do, consider it a feature request!

--

JJW

Download int_vs_sum_for_mr.mw

Looking at the attached worksheet,

it appears that the absolute value, minus 1/2, of the integral of (-1)^x*x^(1/x) from 1 to infinity would equal the partial sum of (-1)^x*x^(1/x) from 1 to where the upper summation is even and growing without bound [0]. Is anyone interested in improving or disproving this conjecture? 

 

Hi, I'm looking for a list of all non-isomorphic graphs of small order (on say at most 9 vertices), ready to use in the networks package. Does anyone know if there is such a list out there? Thanks.

This is a follow-up to an earlier post about CovarianceMatrix.

There are several ways in which Statistics:-CorrelationMatrix can be improved.

CorrelationMatrix shares some inefficiencies with CovarianceMatrix, by computing correlations between the n columns, pairwise. But in doing so it also computes...

Hello eveyone,

I'm experiencing a frustrating problem, trying to get maple to solve a system of differential equations. I have defined my system as:

f:=1-2*(n+1)*b*xi^2*nu(xi):

sys:={diff(nu(xi),xi)=(theta(xi)^n - 3*nu(xi)), diff(psi(xi),xi)=(n+1)*b*xi*theta(xi)^n*(1+b*theta(xi))/f, diff(theta(xi),xi)=-(nu(xi)+b*theta(xi)^(n+1))*xi*(1+b*theta(xi))/f, theta(xi=0)=1, nu(xi=0)=1/3};
 

The only part worth concentrating on is the part I've made bold. I then can solve the system near xi=0 witha  series solution:

Hi there,

I have a 2-D ODE system. Objective: plot the nullclines and phase diagram around the equilibrium point. Problem: one of the ODEs has an integral and a call to DEtools[dfieldplot] returns:

Error, (in DEtools/dfieldplot) extra unknowns found

I have created a minimal example below.

I found that the solve command doesn't work properly with some systems of equations containing radicals. For xample: solve({b = RootOf(_Z^3+c^2+1),c = RootOf(_Z^2+_Z+1), b = RootOf(_Z^3-RootOf(_Z^2+_Z+1))}); doesn't return any results and no "_SolutionsMayBeLost" warning. But using solve(convert({b = RootOf(_Z^3+c^2+1),c = RootOf(_Z^2+_Z+1), b = RootOf(_Z^3-RootOf(_Z^2+_Z+1))},radical)); solves the system. What can be done about it to avoid such situations?