When working with large sparse linear systems you often want to look at their non-zero structure, however Maple's existing tools are all designed for dense matrices. I wrote a little tool to produce images like this in reasonable time. You can download the code here, and the rest of this post is a quick tutorial on how to use the included command. Maple 11 is required.

Dear all, a:=.5; s:=.2; sol:=solve(1+(5*x)*(log(5*x)-1)=.5*v-sqrt(k)*x, x); eval(sol, [k=.98, v=.4]); gives me 0.2019811135 but there should be 2 solutions; if I put the values of k and v before solve: > a:=.5; s:=.2; k:=.98; v:=.4; a := 0.5 s := 0.2 k := 0.98 v := 0.4 > sol:=solve(1+(5*x)*(log(5*x)-1)=.5*v-sqrt(k)*x, x); sol := 0.2019811135, 0.1288902502 i need the 2nd solution and the purpose of this code is so that i can change the value of k and v so I need to make the 1st 3 lines work.

The following is true 'sum(min(2, j)/factorial(j), j = 1 .. infinity)' = 'sum(min(2, j)/factorial(j), j = 1 .. 2)' +'sum(min(2, j)/factorial(j), j = 3 .. infinity)'; But Maple 11.01 thinks it isn't. The answer it gives is 2*exp(1)-2 = -3+2*exp(1) The answer on the right is correct. One the left, Maple seems to think that min(2,j)=2 (which is correct except for the first term in the sum). The problem doesn't seem to arise for finite sums.

I, Andy Gijbels, added 2 new applications on www.maplesoft.com * Tower of Hanoi: Graphical solution (animation) * Double spring pendulum (animation) Feel free to rate or leave comments Andy

The last comment on this thread Singular Planet needs to be removed. This is Spam and does not belong here. Just thought I would point it out because sometimes things like this get missed. Regards, Georgios Kokovidis

Question: How do I generate tickmarks in multiples of Pi? The answer has been posted before but this question comes up often enough that it is worth repeating. In Maple 10 and earlier versions, you had to build a custom list of tickmarks, and the only way you could get the Greek pi symbol was to use the Symbol font. In Maple 11, you can use the new 'spacing' structure with the 'tickmarks' option. To get tickmarks in multiples of Pi, use: > plot(sin(x), x=0..8*Pi, tickmarks=[spacing(Pi), default]); To get tickmarks spaced by 2*Pi, replace spacing(Pi) with spacing(2*Pi). To get the tickmarks occuring on the odd multiples of Pi, use spacing(2*Pi, Pi). The second argument is a fixed value from which the other tickmarks are determined.

In statistical analyses, it is common to fit a model to data where, say, the x-coordinates are known exactly and the y-coordinates are known inexactly, with some assumed error distribution. It is often useful to plot the data, with bars indicating the std. deviation (say) of the potential error in the y-coordinates. Maple's Statistics package has a procedure for doing that: ErrorPlot. ErrorPlot, however draws error bars horizontally, instead of vertically. I do not understand this, especially as the Help seems to indicate that the errors are in the y-coordinates, as usual in statistics. Why are ErrorPlot error bars drawn horizontally?

One thing I enjoy is implementing algorithms in Maple. The latest thing I worked on was Kruskal's Algorithm for finding a minimum spanning tree in a connected and weighted graph. It was something we covered in my summer math class which covered topics in discrete math. Here is a link to the algorithm in the application center: http://www.maplesoft.com/applications/app_center_view.aspx?AID=2133 I believe I have implemented the cycle-detection correctly; but I think there is likely a more efficient way. I may update it later if I come up with a better way.

I knew what to do once, but cannot remember... F(1/j!, j=1..5); ...where... F := proc(X,Range) k := lhs(Range); ... computations of a ... subs(k=a,X); ... end; What do I do to make this subs work...??? k should be 'j', where that 'j' is the global variable.

The MapleReader has been the source of a bit of confusion on MaplePrimes lately. Hopefully with this post, we can help clear up some of the questions that have come up about it. The MapleReader is, as Scott03 mentioned in his response during a separate thread, an extension of Maple 11 that allows an eBook file format called an 'mbook' to be read. A number of authors are currently in the process of converting their content to an mbook file format, to be distributed independently of Maple. The reason why it was included in Maple 11.01 is to allow our authors access to it and it's updates for authoring purposes.

Hello, I am a brand new Maple user. I'm strictly an amateur hobbyist (at mathematics and mathematical software) in every sense, so I hope other members will understand why my questions will be so basic. I look forward to learning Maple, and will be very grateful for any assistance in the future from the Maple users community.

I know this should be posted in one of the help forums, but I would like to get some assistance as soon as possible. Can someone help me with the Dagger command in the Physics package ? I can't seem to get it to work for matrices. thanks,

Can someone help me with the Dagger command in the Physics package ? I can't seem to get it to work for matrices. thanks,

Compiling the OpenMaple sample file omexample.c, and executing omexample -r I get the expected welcome, preceded by this first line: Enhanced external functions enabled.

    |\^/|     Maple (Example Program)
._|\|   |/|_. Copyright (c) Maplesoft, a division of Waterloo Maple Inc. 2004
 \OPENMAPLE/  All rights reserved. Maple and OpenMaple are trademarks of
 

What are these "Enhanced external functions" ? Regards, Alejandro

A real breath of fresh air post over at Mozilla Labs: the combined keyboard-graphical user interface. It makes really good points that, for user input, the bandwidth of keyboard input really can't be beaten. And of course, for output, graphical is definitely superior. I am really looking forward to seeing this in Firefox, and then hopefully have these ideas spread to other applications as well.