M. Mahaswaran's Catalog of Mathematics Resources on the WWW and the Internet ia a very complete list of useful Math links (the most complete I've ever seen).

I'm not quite sure where this should go. I'll post it in MaplePrimes suggestions for now, and move it elsewhere (MapleNet, MapleTA, ...?) if others feel that would be advisable. I have uploaded a Maple 10 worksheet that implements the Hill Substitution Cypher for encoding messages. The worksheet uses embedded components to create what amounts to a Maple syntax-free interface. Here are two views of the worksheet. First, the worksheet 178_HillSubstCipher.mw on MapleNET. And, second, to download 178_HillSubstCipher.mw.

Hi. Hope someone can help me. I have attached a file, created in Maple 10.02 (the Java version). The file seems to be corrupted, since every time i try to open it, I get the following error message: "File open!" "There were problems during the load process. Your worksheet may be incomplete." No input or output is displayed in maple, eventhough the fileize is 552KB. I tried then to open the file with classic worksheet maple 10 and the console, and with both the Java and classic worksheet version of Maple 9.5, still to no avail. If i open the worksheet in notepad or similar, I can tell that the code is still existing.

How to you take sin of a matrix?

Hi... How to have the vertical scaling (y axis) on both sides (left and right) of a 2D graphic? Thanks!

Hi to all I have a .dat file and the few first lines are: 2006-03-22 00:00:00 N=32.90 N=0 N=35.89 N=3 N=56.00 N=0 I want to remove the first line and the N= of the next lines to get only the datas, i.e. 32.90 0 35.89 3 56.00 0 How to do it? Thanks for your help de Pierre VE2PID

Hello to All from Dr. Arlou Let's take few Structural Mechanics problems. ALL SOLUTIONS ARE ANALITICS IN PRINCIPLE Discussion question: Maple opportunities in Applied Mechanics Little example for students Winkler foundation

I did some complecated calculation for cloth simulation. When I get the value from C++ Maple API, it is 1.#QNAN. But when I get the result from Maple, the value is following: (-0.6205772259e-2-0.2125843006e-1*I)*(Pi-1.928059303+5.979053727*I)+0.2356552645e-2*(Pi-1.928059303+5.979053727*I)^2 What is the meaning of 'I' in the result? I am dying to solve the calculation without 1.#QNAN.

Hi.. Is there a Maple pcocedure to evaluate the arithmetic mean of the n preceeding datas (of a data) in a list of numbers? Thanks

Hi all, I have a thirdgrade equation and I wish to find the values when f(x)=0 So I have typed in the equation as well as f(x)=0 and wish for maple to give me the intersect points for L:=2*x^3+6*x^2-2*x-6:M:=0:plot([L,M], x=-4..2, y=-7..7); With the help of the help section I then add P:=Intersect(L,M); But I just get the equation read back to me. The answer I am looking to be displayed is -3,-1,1 How do I get maple to do this? Thanks in advance :-)

Ignore this posting. The question was answered already in comp.soft-sys.math.maple. The problem was the use of point as the first argument of rotation. Change the two lines

> rotation(point,P,evalf(theta),el);
> coordinates(%);

to

> rotation(PP,P,evalf(theta),el);
> coordinates(PP);

and the procedure will work.

--Edwin
-------------------------------------------------------------------

When I execute the procedure Rot below it works fine the first time but a second execution gives an error message? Is there a way to fix this problem? I have to do a restart to make it work again.

The new poll surveys what we all do with our time ...

I have only one question, how could I plot the following function correctly?

> f:=x->piecewise(x<-1,1,x=0,2,1);

I try this command but I do not reach the correct result.

> plot(f,-3..3, style=point,discont=true,numpoints=100);

This example illustrates why you should prove with results of solve command.

You solve this equation: (x-1)^3/(x^2-1)=0 by Maple 9.5 > solve( (x-1)^3 / (x^2-1),x);           [1,1]

Maple 9.5 and earlier gets the result [1,1], it is not correct but the result of Maple 10 is correct - no roots. This is the reason why you have to prove results.

This is a quick programming exercise to correct the following problem in Maple:

for n from 8 to 12 do 
  A := Matrix(2^n, 2^n, storage='sparse'):  # zero matrix
  print( 2^n, time(LinearAlgebra:-Transpose(A)) );
end do:

The problem is that the LinearAlgebra:-Transpose command is not sparse. That is, the time it takes is proportional to the overall size of the matrix and not to the number of non-zero entries - even when your matrix uses sparse storage. In this post we will look at what is required to program a new Transpose command which can handle much larger matrices.