funny that, how do I go from first blog post to third blog post!?!?!

that's because my second blog post appears as a comment to my first blog post.

you've just got to learn...

Since much of what I post couldn't possibly be of interest to anyone else, I thought I'd use the blog. If I remember its existence, I'll try to post here stuff to myself. After all it's less likely to be lost here than in the maze of my harddrive.

Hi everyone. Is there any way to keep auto-rotation of three-dimensional graphics? If so, how to do it for complex graphics created by the function plots[display](G1,G2,..,Gn)?

I want to find a tagent lines to the below contourlines for a function  U := Q[a]^alpha*Q[b]^(1-alpha); given any

value of Q[a] and Q[b]. I know the slope of such a tagent lines but I dont know the intercept. How can I derive such an equation ?

I would like to customize arrows of motion in a phase diagram. The system is the following, with critical point (1,1):

xdot := diff(x(t),t) = x(t)-y(t):
ydot := diff(y(t),t) = y(t)*(1-x(t)):

with phase diagram (the black line is the stable manifold of the system):

What keyboard configuration must have the Win XP to use the keyboard shortcut "Shortcut Keys" and not the key combination "International" to introduce 2-D math expressions. I refer to the help "2-D Math Shortcut Keys and Hints".
The configuration I have enabled is:
Input Device Language: Spanish.
Keyboard layout / IME: United States International.
Gracias
HerClau

 

when the expression is short, the 'collect' can works,but the expression is longer,it is different.for example: gg1 := collect(expression, z)

Hello:)

Im trying now to make a program that does the same thing as BackwardSubstitutes in maple
I tried 2 things


I tried combining the matrix and the vector in the procedure but its not working

substitutioninverse := proc (matrice, vecteur)
local n, m, j, i, resultat, V, matrice2, a;
matrice2 := [matrice, vecteur];
m, n := Dimension(matrice2);
 V := Vector(m);
for i to m do
 resultat := 0;
for j from n to 1 do

Hello, In Mathematica, one can plot a region where an inequality is true by using the RegionPlot[] function. E.g. if the region (x^2 + y^2

Hi, I am wandering whether are some functions to compute all irreducible polynomial and prmitive polynomial over Galois field. For example, I want to all the irreducible and prmitive polynomials of GF(2^5). are there such commands to perform that? thanks

Hi there I'm in desperate need for your help! I need to solve the rocket motion equation numerically in Maple or some other program. I'm having trouble writing the ODs in the program and setting up all their parameters. I have derived the rocket motion equation in a single dimension: [tex] \frac {d\vec v_r(t)}{dt} = - \, \frac {\dot m_e(t)} {m_r(t)} \, \vec v_e(t) [/tex] I assume that the change of mass is constant and the exhaust velocity is constant. Let's say that the rocket has an initial mass of 1 kg, an empty mass of 0.1 kg and the exhaust velocity 5 m/s.

Hello,
Im trying to make a program that does the same thing as RowOperation in maple but i dont know what to write to make it return the new matrix matrix
thats what i tried



rowoperation := proc (matrice, i, j, r)
 local m, n, k;
 m, n := Dimension(matrice);

Hi,

I have only been using maple for the last 3/4 months. Its part of my course in college. We have only covered, what seem to be basic topics but they aren't entirely. We have covered 'for loops, if statements, boolean functions, matrices and procedures'. I am finding some of it difficult as the lecture isn't necessarily capable of teaching it. Here is an example of the kind of revision questions she gave us:

 

 

Every year my extended family does a "secret santa" gift exchange. Each person draws another person at random and then gets a gift for them. At first, none of my siblings were married, and so the draw was completely random. Then, as people got married, we added the restriction that spouses should not draw each others names. This restriction meant that we moved from using slips of paper on a hat to using a simple computer program to choose names. Then people began to complain when they would get the same person two years in a row, so the program was modified to keep some history and avoid giving anyone a name in their recent history. This year, not everyone was participating, and so after removing names, and limiting the number of exclusions to four per person, I had data something like this: