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.

After read this funny post by Will, I implemented a short function in Matlab (linked to Maple) to count the number of occurences of any number into the 10.000 first digits of Pi. Here is the result for the first 9.999 numbers:

Trying to use Maple to perform some trigonometric transformations, I found a good introduction to Maple: MCS 320: Introduction to Symbolic Computation of the Department of Mathematics, Statistics, and Computer Science @ the University of Illinois at Chicago. It have some lines about the Maple function, which give that kind of informations:

>> trigsub(cos(2*x));
[cos(2*x), cos(-2*x), 2*cos(x)^2-1, 1-2*sin(x)^2, cos(x)^2-sin(x)^2, 1/sec(2*x), 1/sec(-2*x), 
(1-tan(x)^2)/(1+tan(x)^2), 1/2*exp(2*i*x)+1/2*exp(-2*i*x)]

An algorithm created to help scientists process images of tiny specimens has unexpected applications for brain teasers. When Cornell physicist Veit Elser attempted to demystify an esoteric imaging problem for biologists, he had no idea his solution would also help subway riders and break room loiterers around the world figure out those challenging, Sudoku puzzles. While creating an algorithm that could render images of small and delicate biological specimens, Elser inadvertently found a universal solution for the popular Japanese brainteasers. "This algorithm, which was extremely effective in image reconstruction microscopy, was extremely general," he said. "If you just express it in the right mathematical language it could be used in all kinds of things."

It seems to me that when I look at lists such as New Content that I see messages in a scrambled order. I'd like to see them in reverse date order. Rich

I can see it on the first page - maybe - but when I start browsing the forums, I don't want all the stuff on both sides. Rich

I'd like one. Or do we have it and I just have not seen it? Rich