Hi,

I started using Maple recently. The output sometime is not simplified like that in the attached picture. How can I simplify such expressions?

Hello,

I am trying to write a procedure to see, which (di)-graphs are isomorphic (here represented by there 3*3 adjecency-matrices). When I try the procedure for all 3*3-matrices with entries in {0,1} (there are 512 of them), I get the following error:
"Error, (in GraphTheory:-IsIsomorphic) invalid subscript selector"

Can you possibly say, what I am doing wrong? My code is the following:

My input is a list (JJ) of 512 3*3 matrices constructed the following way :

When I run this procedure on some of the 512 matrices it does work, but it crashes somewhere around matrix 350. I have try so split the list of the 512 matrices, and I am able to run the procedure on these splits, but this is very inconvenient :-)

I hope you can help me. Also if this can be done in an easier way - I am new to programming and recieve help with a smile.

Yours, Tomas.

Hi,

Hi I am getting this message while soliving my first order non-linear initial value problem.

please share me your thoughts

ode := dsolve({diff(y(x), x)-2*(diff(y(x), x))^3 = -2*x+2, y(0) = 1}, type = numeric, range = 0 .. .24);
Error, (in DEtools/convertsys) unable to convert to an explicit first-order system

Abbas

Hi everybody

In the attached file, when I run the code an error appears while calculating "omegaL1" parameter. The dimensions of the matrices are correct but the source of error is unknown to me. Can anyone help me?

Thanks in advance

R2_Link_2D.mw 

This must have a simple answer but I have been unable to figure it out after many attempts. 

I am trying to create a Clifford algebra, and then use the results in the multiplication table "MT". The multiplication table elements are correct as displayed, but I don't know how to access the results in the table (i.e. the products of the basis elements).  For example, trying to access the table results as matrix elements like MT[2,3] doesn't work, presumably because it is not a matrix. In other words, I need a matrix that contains the same information as the multiplication table.

DGsetup([x, y, z], M);
I12 := Matrix([[-1, 0, 0], [0, -1, 0], [0, 0, -1]]);
AD3b := AlgebraLibraryData("Clifford(3)", Cl3Q, quadraticform = I12);
DGsetup(AD3b, '[e0, e1, e2, e3, e12, e13, e23, e123]', '[omega]');
MT := MultiplicationTable(Cl3Q, "AlgebraTable");

Hi everyone, i am using Maple 18 and i have a problem in converting a equation to a nice polynomial form (a cubic equation with a form of A*x^3+B*x^2+C*x+D), can anyone please help me on the command? Thanks in advance.

My equation is "  d := s*x*(E*K*q-K*r+K*sigma[1]+r*x)*(1-x*(E*K*q-K*r+K*sigma[1]+r*x)/(K*sigma[2]*L))/(K*sigma[2])+sigma[1]*x-x*(E*K*q-K*r+K*sigma[1]+r*x)/K  " or for simplicity is

Can someone please teach me on the command? Really appreciate the help!

Hello, thanks for read me

I don't know why my code don't work, I'm trying to calculate the magnitude of a complex vector but I get a error in the next image you can view it, 

Can someone help me? thank you

Greetings People!

I am modelling a dynamical system using variational formulation. The final step is to plug in, the energy values, in the Euler-Lagrange Equation. The functional has both explicit dependence on time, and implicit dependence (in the form of the generalised coordinate). Since motive of the exercise is to obtain the governing equations for the generalized coordinates, this implicit dependence is unknown. How can Maple be used to derive the differential equations in this situation?

As an example, consider,

Here, ld and l are variables, which are function of time. In order to calculate the term,

How do I proceed? Thanks in advance.

Good day, I need to 2D plot from points which I get by solving numerically 17-degree equations. Firstly I take an only first solution of the equation as below, and I have a Matrix with 3 column which represents X, Y, and VALUE respectively. On the left side should be the first column ( X ), and right axis Y (2. column). As seen from Matrix X and Y getting the value between 0 and 10. Is there any option that I can plot my data in 2D?  Thanks in advance.

points := seq(seq(seq(Fun[n, i, j], n = 0 .. step), i = 0 .. step), j = 1);
Mat := Matrix((step+1)^2, 3, [points]);
         .                             X                  Y                 VALUE
           
with(plots);
pointplot3d(Mat, style = point, color = black);
 
 

i want to solve the system of equation ( 1 )  , (2)  ,  (3)   under the assumation that x , y have the CDF in (4)  ,  (5)
 

Download internet.mw

How do we write code for optimal problem using Pontryagin's maximum principle for simulation.

Use the command 'matrix' to define a matrix, and how to call the first row elements of the matrix?

This method

a:=matrix([[1,2,3],[4,5,6],[7,8,9]]);

a[1..2,-2..-1], does not work? Why？

How do I?
I'm very new in Maple, just I wanna learn a lot but i don't know where to start.
I have to find x,y, Tl, Th and Ti

Maybe we can help me at least a litle bit :D
thanks

Hello,

Maple 18. I just got a 4K monitor and the filenames and bottom toolbar are far too small. Is there any way to resize them? Does the same problem exist on later versions?

Thank you.