Hi,

statements

I have been running Maple 11 since 2007.  Recently my PC was upgraded to Windows 7: upon reinstallation I appear to still have full mathematical functionality but can no longer save files. The "Open" button/menu are both equally unresponsive, although I can open old files by double clicking on them,

Please could you advise how I can resolve this issue.  Thank you.

Dear

I wrote division of two  reguler matrices. I would like to give Maple program. What should I do?

Here is a link to a maple file I found describing what happens to a glider where k=.9--->  k=.9.mw

I would like to see what happens to the same glider when k=0.----> k=0.mw

***k is the strength of a propeller.

How do I determine whether or not it is a sink/source/spiral/etc based on the eigenvalues?
I was trying to use

f describe the horizontal motion

g describe the vertical motion

h := sin(t);    

g := piecewise(t < 0, Diff(x(h),h$2)+2*Diff(x(h),h)+10*x(h), t > 0,Diff(x(h),h$2)-2*Diff(x(h),h)+10*x(h));

dsolve([g,h]);

can not solve

Error, (in unknown) invalid input: diff received sin(t), which is not valid for its 2nd argument

f := sin(m(t));   
g := piecewise(t < 0, Diff(x(m(t...

hello,

I need to find a sollution for equation in maple 14

a*s = b mod c, where a, b, c are know integers, for example

Hello everyone;

I have a usecase in which I need to solve system of 8 equations, using high number of unknowns (16, to be precise). Currently it goes like this: Maple computes as usual for about three minutes, then it starts consuming RAM at 100mb/sec rate until my PC hangs completely.

I was wondering, if it somehow possible to solve equations with such high number of unknowns? Maybe there is some function or setting that will allow computations with less RAM requirements ...

Hi mapleprimes,

I'm having trouble with the creation of an array which each element would be a matrix. I've tried what seemed natural to me...

SOM := Array(1 .. 10, 1 .. 10,Matrix(28, 28, evalf((1/10)*rand(1 .. 10))));

... but it created an array 10x10 with zeros. Then I tried to fill each element individually...

for i to 10 do for j to 10 do SOM[i][j] := Matrix(nbLin, nbCol, evalf((1/10)*rand(1 .. 10))) end do end do

i have some equations,and i want use them in the Hamilton's principle to drive my my equations,can i use maple to take variations?thanks for your help and attentions,

I have written the maple code to calculate time domain value of the laplace domain equation. It contain slowly converge double series so that I used epsilon algorithm to accelerate convergence. one summation contain 7 terms and another summation terms reduce to 850 terms after the use of epsilon alorithms. I also used deHoog algorithm with 9 terms to obtain time domain data but maple give the following error:

Error: (in evalf/exp/general) object too large

Do...

Dear members,

I am trying to solve a maximalization problem, but in stead of solving my problem Maple only displays the equation that I am trying to solve.

Example:

>  Sigma_max:= maximize(-N/(b*h)+(-EI*(diff(u(x),x,x)))*0.5*h/I, x=0..l = sigma_t;

sigma_max:=maximize(-0.400000cos(0.25pi)N+564e*N*x .....etc...., x = 0..250)=1.43 10⁶

In an atomic physics calculation involving the quantum theory of angular momentum, there appear polynomials whose coefficients involve square roots of positive integers, for example

sqrt(6)-sqrt(2)*sqrt(3) 

Maple does not cancel such an expression to zero because the code allows for the possibility that a square root can be positive or negative.  In the physics context all these square roots are positive.  Is there some simple way to induce Maple...

hi

I want to extract sin^3(x) to sin(x) and sin(3x)

how can do this with maple?

Hi everyone,

I recently posted about a problem I had with an iterative scheme in 2 dimensions.. someone answered that and it worked perfectly:)

I've now moved on to a slightly more complicated version. It's in 3d but only the r and z values will be used in the iteration (trying to get the catenary)

so it's not as hard as the main problem that I'm building towards.

Basically, I'm having trouble converting the points to polar coordinates and assigning them each a [j...

Hi, I have a maple project and one of the questions reads: 

a. | Initially, a 100 – liter tank contains a salt solution with concentration 0.5 kg/liter. A fresher solution with concentration 0.1 kg/liter flows into the tank at the rate of 4 liter/min. The contents of the tank are kept well stirred, and the mixture flows out at the same rate it flows in.
i. Find the amount of salt in the tank as a function of time.

ii. Determine the concentration of salt in the tank at any time.