Hello!

I'm trying to solve numerically an ODE system with piecewise. And this piecewise is very important for this task.

This system describes behavior of a pulley with friction. There are some constants: m, c, g, mu and J. Values of this constants are not important.

> sys := m*a(t) = piecewise(a(t) < a0, F0*time, a(t) >= a0, 0), v(t) = diff(x(t), t), a(t) = diff(v(t), t);
> m := 5; F0 := 10; a0 := 5;
> initialconditions := x(0) = 0, v(0) = 0;

Dear folks,

 In mapple programming while assigning a fraction to a variable...it directly simplifies it....

eg: x:=4/6 and it directly gives 2/3

can we make mapple not to simlify this fraction....

It is very important for me to find out....

please help me

thanks in advance

regards

uday

I have looked at the maple help for the ErrorPlot function, but i can't make it work for my plot. 

I have the following procedure:

K := 1.; Xrng := [seq(dt*i, i = 0 .. ntime)];

value := array(1 .. ntime+1);

ave := array(1 .. ntime+1);

for j to ntime+1 do:

discountfactor := exp(-r*j*dt);

Stot := 0.;

Stot1 := 0.;

for i to npath do:

Spath := max(Spot[i][j]-K, 0);

Stot := Stot+Spath;

What does it mean when I get the message, "Warning, model is not of full rank"?

Thank you.
Janice

Hi all,

Is there some way i can find the width of a plot?

I have the equation below:

Prob:=(w,T)->(B^2)*(sin(w*(T/2))^2)/((w/2)^2);

plot(Prob(w,6),wf=-3..3);

Which produces a gaussian looking plot, the plot reaches zero at some...

When entering an expression into Maple that is not in simplest form ( Maple desktop will automatically change it to x+y. I have tried subtracting equivalent expressions, using evalb, using convert, and using simplify, but I cannot get 2*(x+y)/2 to be equivalent to (x+y) using the MapleNet web service.

Any help appreciated.

mem2.mw

Although i have defined K5 as a constant before solving the equations , maple returns an error message saying that

"Error, (in fsolve) k5 is in the equation, and is not solved for"

And i am alos trying t find the roots of the equations in a certain range as specified above.

Dear All!

Could you explain how the coulditbe() function works?

> assume(q, integer, w, integer); about(q, w); coulditbe(q/w < 1); coulditbe(q < w);
Originally q, renamed q~:
  is assumed to be: integer

Originally w, renamed w~:
  is assumed to be: integer

                              FAIL
                              true

BR,

Zoltán Faigl

Good Morning.

I have problem when i want to graph my equations. I received this error: 

Error, (in plots/odeplot) curve is not fully specified in terms of the ODE solution, found additional unknowns {t}

I would like to know how i can solve it

Thanks in advance 
 

Dear All,

I ran into a problem, which I can not resolve. 

> Eqs := [x*0 = y*0]; Vars := [x, y];
                            [0 = 0]
                             [x, y]
> solution := solve(Eqs, Vars);
                        [[x = x, y = y]]
> Eqs := [x*b = y*b, b = 0]; Vars := [x, y];
                       [x b = y b, b = 0]
                             [x, y]
> solution := solve(Eqs, Vars);
                               []

Hi guys,

I have a question.

I ploted two graphs using "spacecurve" function, respectively.

But, I want to plot two curves in one graphes.

(One the other hand, I want to compare two curves numerically).

thanks, and Have a good day!

----------------

version : Maple 11

Major : Physics.

Hi, my professor wants our graphs to be labeled (which is reasonable). How can I label the graph I made this way:

>inequal({x[1] >= 0, x[2] >= 0, x[1]-3*x[2] >= -3, 2*x[1]+3*x[2] <= 6}, x[1] = 0 .. 3.5, x[2] = 0 .. 2.5)

Thanks.

Hi,

I am trying to solve for the 2D temperature distribution (heat flow) through a brick, using finite element analysis.  I created a 341*341 matrix for each nodal equation, and a column vector that is the solutions to each equation.  I want to find the temperature at each node using A^-1 * B or LinearSolve(A,B).  My problem is that when I do this the entire solution vector is 15.  I have a constraint where the bottome nodes are all at 0 degrees. ...