I have encountered an error with plots:-pointplot. > plt:=plots:-pointplot([ [1,1],[2,2] ],color=[COLOR(HSV,1,1,1), COLOR(HSV,1/2,1,1)],style=point,symbol=solidcircle,symbolsize=15); plt := PLOT(POINTS([1., 1.], [2., 2.]), STYLE(POINT), SYMBOL(_SOLIDCIRCLE, 15),COLOR(RGB, Array(1..6, [...], datatype = float[8]))) As you see the input list is using the HSV scheme but in the output it has been switched to RGB. This of course is reflected in the actual plots.

Hi all,

I am new to this forum and to Maple, I would appreciate some help. As you can read from this post

http://www.mapleprimes.com/forum/integralslongsumsandkernelconnectionlost

I am trying to evaluate an integral of a long sums of functions. In that post (still unanswered) I report a kernel connection lost. I have now raised the datalimit to my physical limit, so that the "kernel connection lost" error has disappeared (for now). The real problem is that I need to increase the order of my Fourier Series up to eight terms or more.

Questions:

Hi all,

I am attempting to solve the following coupled, non-linear system of equations:

F:=(x,y)->x*(1-G(x,y)/y*(1-G(x,y)))^2;

G:=(x,y)->y*(1-F(x,y)/y*(1-F(x,y)))^2;

In particular, I want to know under which conditions for x and y it is true that F(x,y) = G(x,y)

Can this be solved as a fixed point DE (to get two equations with two unknowns) ?

My attempts at computing the partials has so far failed:

diff(F(x,y),x);
Error, (in F) too many levels of recursion
 

Any hints would be most welcome!

Wolfram Alpha is launching in May - that looks interesting.

Alec

You can duplicate this in Maple 11 or Maple 12: restart; L:=Array(1..10, j->rand(0..1)()); L := [0, 0, 0, 1, 0, 1, 1, 1, 0, 1] restart; L:=Array(1..10, j->rand(0..1)()); L := [0, 0, 0, 1, 0, 1, 1, 1, 0, 1] restart; L:=Array(1..10, j->rand(0..1)()); L := [0, 0, 0, 1, 0, 1, 1, 1, 0, 1] restart; L:=Array(1..10, j->rand(0..1)()); L := [0, 0, 0, 1, 0, 1, 1, 1, 0, 1] restart; L:=Array(1..10, j->rand(0..1)()); L := [0, 0, 0, 1, 0, 1, 1, 1, 0, 1]

The maplev emacs mode provides a means to communicate to the tty (command-line) maple process.  Alas, the method is rather crude; I designed it that way because it was all I knew how to do.  However, I would really like to improve it; I'm looking for advice. 

I was considering what sorts of "normally coded" things might get broken by the loading of a Maple Library package and the ensuing rebinding of names.

And so I tried this,

> with(RealDomain): # rebinds sin

> convert( cos(x), sin );
                                     sin(2 x)
                                 1/2 --------
                                      sin(x)

I was actually surprised to see that work OK. I was expecting `convert`...

I have recently been working on a problem using fractional calculus and have come across something in Maple's fracdiff  command that makes no sense to me.

Consider the function y:=a+b*(x-q)+c*(x-q)^2

z:=subs(x=q,fracdiff(y,x,1)) gives the correct answer of z:=b, z:=subs(x=q,fracdiff(y,x,2)) gives the correct answer of z:=2c, z:=subs(x=q,fracdiff(y,x,3/2)) gives the answer of z:=4*sqrt(q)*c/sqrt(pi)

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 ??