I want to find the first positive and first negative root of a bessel function

j2 := (x, a) -> k(x)^2*a^2*(diff((diff(1000000000*sin(1/1000000000*k(x)*a)/(k(x)*a), x))/(k(x)*a), x))/(k(x)*a)

I couldn't use the built in bessel function with two variables, so I had to enter it by hand.

I want to find the values of x where j2 is zero as a function of a:

f := (a) -> RootOf(j2(x, a), x, 0 .. 2)

plot(f(a), a = 2 .. 2.25, y = -3 .. 3)

Hey folks. I have a massively complicated equation I'm trying to solve and the internal memory can't take it.

Here is the problem.

Let f(x) := 1 - lambda*x^2

alpha := 1/f(1)

By solving the following equation,

alpha*f(f(x/alpha)) = f(x) + O(x^4)

We can determine a value of lambda and hence alpha (for which the real value is roughly -2.5 and the calculated value here is roughly -2.7).

hello everybody

please heeeelp

I ran an advanced search in the application center at maplesoft and I'm not sure that it works properly.

Under advanced search I left the search field blank and selected MapleV to find all applications submitted for MapleV.  The first thing that happens is that it comes up with applications rated for newer versions of Maple.  Then it asks to click here to search our archived Maple-related applications (prior to Maple 10).

So I do that but it only produces...

hello everybody can you help me please

how can i canvert this list [1,2,3,4,5,6] to a number 123456

hi ,friends

  now ,i get a matrix of symbolic expression,it's difficulty to find the simplest forms using the common command  as like simplify or combine

p := Matrix(4, 4, {(1, 1) = (1/2)*exp((1/2)*J[1]-(1/2)*J[2]+(1/2)*J[3])+(1/2)*exp(-(1/2)*J[1]+(1/2)*J[2]+(1/2)*J[3]), (1, 2) = 0, (1, 3) = 0, (1, 4) = (1/2)*exp((1/2)*J[1]-(1/2)*J[2]+(1/2)*J[3])-(1/2)*exp(-(1/2)*J[1]+(1/2)*J[2]+(1/2)*J[3]), (2, 1) = 0, (2, 2) = (1/2)*exp(-(1/2)*J[1...

Hello friends,

When I solve the optimization problem with restriction (below):

NLPSolve( ln(x1) +ln(x2+5), {x1 +x2 <=4}, assume = nonnegative);
     [-Float(infinity),

       [x1 = HFloat(0.0), x2 = HFloat(0.8333333333333334)]]

I get the expression  "-Float(infinity)"..

What do Float(infinity) and  HFloat(0.833333) mean?

Thanks for the attention,

Hello everybody!

I'm working on a statistical problem. I need to plot confidence regions for parameters in the model, but I don't know what I should do. I tried to get some programs from the internet, but either they don't work or I don't understand details of them to change for my work. Can someone introduce a good program to me?, or does anyone have another useful idea for me?

Thanks a lot!

I meet a problem in the use physcis package.

    for example,

                                   restart;  with(Physics); Setup(mathematicalnotation = true):

                  ...

I am analyzing a system that was at steady state and then subjected to a step change.  I have the steady state modeled with a system of ODEs.

I am going to model the step change with a system of PDE's.  The system will be discretized in space and time (z,t).  I know how to setup one side of the boundary conditions (0,t) for all variables, but the other (i.e A(z,0)) I would like to use the results of the steady analysis. Does anybody have some ideas on...

I would like to do the following

A[1,1],A[2,2],A[3,3]:=seq(i+2,i=1..3)

using seq on the left-hand-side. I know I have done it in the past but don't get it this time. End up with error messages. Not sure what am I missing.

thanks a lot

Dimitrios

Hello Maple experts,

I call "out"  the development of the sum(x^2, x=a..b):


"out":= sum(x^2, x=a..b);


            1        3   1        2   1     1   1  3   1  2   1  
out=     - (b + 1)  - - (b + 1)  + - b + - - - a  + - a  - - a

Hello All,

I am having a problem plotting the solution of a system of PDE's.  Maple evauates to a module, but when I try to plot any of the dependent variables (of space and time) vs time, all I get back is:

"PLOT(...)"

My module is called Final, and so my plotting command is as follows:

p1:=Final:-plot(A(z,t),t=0.5);

This is where I get "PLOT(...)".  Any help would be greatly appreciated!!! Thanks!

Hello.

I need to generate 200 random numbers from a normal(0,1). I used the following code:

N:=200:
Y:=Array(1..N):
for i from 1 to N by 1 do:
     Y[i]:=Generate(distribution(Normal(0,1))):
end do:

This code works. But the numbers generated aren't a random sample. You can check that in the following qqplot.

Dear my friends

Hi

I am solving a nonlinear differential equation by Maple. The equation is slarge. A large amount of memory is then required. I have a computer with 8 gigabytes memory. This memory o large and has many terms. Therefore, the algebraic expressions created in process of solving are so is very low to perform some commands of Maple such as "taylor" or "expand". I compel using the "restart" command to clear the memory after saving the results of each...