Hi everybody:

was wondering if someone could help me figure out what change took place in Maple 16 so that the expression shown below does no longer work

A:=a->Matrix(2,2,[[a,3*a],[a,4]])

It worked OK until 15

thanks

karamand

I want to find the diffrential equation of

Find the value of the integral I=∫√(tanx)dx

The following is a differential equation with separable variables.  It is solved with dsolve and "manually".  Why is the dsolve solution so complicated?

Ratch

Find the value of the integral I=∫√(sinx)dx

I'm now using Maple 15 to get derivative funtions in a function with multiple parameters. So I want to find out the derivative w.r.t just one parameter. In the forum, I found out one way to solve this issue. 

In order to prove the correctness of the function D[3](m,n,p,r,x), I firstly use a very simple program to test it. 

In the Engineering PoA-Example.mw file, I've used a simple function called testFor with 5 parameters to generate a mathematical...

Hi everyone,

Here is the code:

Ralpha:=sqrt(d)*IdentityMatrix(2):

alpha:=Array([WienerProcess(Ralpha),WienerProcess(Ralpha),WienerProcess(Ralpha),WienerProcess(Ralpha)]):

alpha1:=k->Vector[column]([[alpha[1](k)[1]],[alpha[1](k)[2]],[alpha[2](k)[1]],[alpha[2](k)[2]],[alpha[3](k)[1]],[alpha[3](k)[2]],[alpha[4](k)[1]],[alpha[4](k)[2]]]):

Finance[ExpectedValue](alpha1(0)[1]*alpha1(0)[1],timesteps=100,replications=10^4);

----> 

I have a rather large multivatiate polynomial "Dtest"  I need to divie it by a cubic poly "DGm" using rem and quo. Both are determinants multiplied out,  both given below. Have spent the past 2 nights trying to sort, collect, expand, equate coefficients plex groebner etc. Am trying to collect up all the powers of c₃ but cant anything to work. even expand doesn't fully expand "Dtest". If I set c₁ and c₂ to 1 things are...

Hi guys

Is there any build-in function which converts [[x>5, x<10], [x < 0]] to "x>5 and x<10 or x<0"? I've written my own function, but I want something build-in.

Thanks :)

Hi everyone,

Working on my project, I have this error "Error, (in VectorCalculus:--) too many levels of recursion".

The project is about filetring a stochastic process.

When I want to calculate one of the integrals, I have that error.

Here is the code:

Rxi:=sqrt(d)*IdentityMatrix(4):

xi:=WienerProcess(Rxi);

Reta:=sqrt(d)*IdentityMatrix(2):
eta:=Array([WienerProcess(Reta...

Hi, I am trying to solve the following differential systems using dsolve numeric but there is something wrong with my code.

I am fairly new to Maple and cant work out why it is telling me that it doesnt work. COuld somebody help me?

DifferentialSystem := {diff(r(t),t$2)-r*(diff(theta(t),t)^2=-1000/r^2 ,
                            r(diff(theta(t),t$2)+2(diff(r(t),t)*(diff(theta(t),t)=0,
                            r(0)=sqrt(65), theta(0)=1.446...

I have to solve a linear system

in Maple. A is a tridiagonal matrix.

My problem is that my matrix A is big and therefore, I have to wait too long. Is there some function in Maple that can help this problem?

Hi. I have a question that concerns indices of vector of functions within for-loop.

I have a following piece of code:

Check the correctness of the solution by substituting for all found roots.

This are my found roots:

a:=12+10x^4+7x^3-89x^2+65x

and i found my roots (e.g);

b:= -3.5666666666,1.238969999,5.7777777,8888888888

Hi,

I am trying to plot in Maple 16 (just installed) and I am getting text output. Maple 15 worked just fine.

Anyone have ideas?

Regards.

> plot3d(x^2-y^2, x = -2 .. 2, y = -2 .. 2);
%;

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