Hi everyone

I'm trying to solve the following system of ODE equations for my end paper and since I'm new with maple I couldn't find a way to do it. Can anyone Plz help me? I need to fit a curve to the result and gain a symbolic equation.

Here are the equations I need to solve

d^2*Y(x)/dt^2 = 500000*Y(x)*exp(-10/T(x))+d*Y(x)/dt

d^2*T(x)/dt^2 = 10*(-100000*Y(x)*exp(-10/T(x)))+d*T(x)/dt

with the follwoing boundary conditions:

Y(0)=1 , Y'(0)=0, T(0)=0 , T'(0)=0

I need to plot Y and T and then find then do the curve fitting thing.

I really appreciate your help.

I am trying to integrate solutions to a set of differential equations I have obtained numerically but keep getting this error:

Error, (in solW) invalid input: subs received sol(r), which is not valid for its 1st argument

For simplicity, let's say I am interested in integrating the function W(r), which I obtain from 

sol := dsolve({eqns, ics}, numeric, abserr = 10^(-10), relerr = 10^(-10), range = ymin .. ymax)

I then use

solW := r -> subs(sol(r), W(y))

This gives me W(r) for any r in the range ymin to ymax. But I cannot do anything with this function. For example, 

int(solW(r),r=ymin..ymax) or plot(solW(r),r=ymin..ymax) give the error above. I know that I can plot the solutions using odeplot, but is there something analogous for integrating the solutions? 

Thanks!

Why maple reorders expressions when they are exported in LaTeX? For long expressions this is very anoying!

Thank you

Hello

Previously today I had to do some chemistry assignments, which I did in maple, my long time favorite for such assignments.

However I have now encountered a severe problem. I cannot open my worksheet file, .mw. When I try to open it, it asks me whether to open the file as maple text, plain text or maple input??? 

Whatever one I choose, it either opens a blank page in maple, or maple just crashes.

The file in question should be attached. If you can open it, don't mind the language, it is danish

Any help will be greatly appreciated, best regards, Jens

Maple Worksheet - Error

Failed to load the worksheet /maplenet/convert/Opgaver_fra_bog.mw .

Download Opgaver_fra_bog.mw

Hi everyone,

I'm kinda new here, and I really hope you guys can help me through this.

I'm doing a term project and I need to solve this differential equation. I tried to make it work, but since I'm new with maple I couldn't get to any result. So I really appreciate if you can help me solve the problem, since I am eally stuck here and all other results sort of depend on this equation.

here is the equation:

diff(y(x), x, x) = -(8*omega*(1-exp(-8*x))*exp(-8*x)/(2*x^2)-pi^2/(32*x))*y(x)

with following boundary conditions:

y(0)=0,

y(1/2)=0 ,

y'(0)=1.

thanks again.

Hello everyone. I have a few questions. For example, a tensor 1 and 2 ranks in some coordinate system. It is understood the equivalence 1 rank tensor and a vector. How to determine the flow and the divergence of the tensor. Maple is already in the package VectorCalculus command flux and divergence, as in the subpacket Vectors Physics package has a command divergence. But what about the tensors 2 and higher ranks? Is it possible to do these things a uniform manner? Under flow tensor mean surface integral of the scalar multiplication of the tensor of the 2nd rank in the normal vector, followed by contraction. My sketches in the attached file.

Flux_tensor_field.mw

this module looks at the numbers in the list and reports "true" if they are nonnegint (whole numbers).  is there a way to make the printout go across the page instead of down?

                               -3
                             false
                              -2.5
                             false
                               0
                              true
                               1
                              true
                               3
                               -
                               2
                             false
                               Pi
                             false
                              (1/2)
                             5     
                             false
thanks in advance!

les

plot([Y2(t),-X2(t),0...100],numpoints=100);

Error, (in plot) procedure expected, as range contains no plotting variable

Completely new to maple. Not even sure where to start with this. Can't get the Simpson's or Trapezoidal Rule to work for me. Any help would be much appreciated

dear all

how do i do for deletion of some columns? example:

A:=Matrix([[1,2,3],[4,5,6],]);

change to this: A:=Matrix([[1,2],[4,5]]).

i have a Matrix 8*12 and i want change it to 8*8

plz help me.

and

and

Here is a serious achievement of the Roots command:

Student[Calculus1]:-Roots(2^x+3^x+6^x-x^2);

                              [-1]

plot(2^x+3^x+6^x-x^2, x = -6 .. 2, gridlines = false);





Download Roots.mw

The solve command also does the job here:

sol := solve(2^x+3^x+6^x-x^2);

allvalues(sol);


evalf(%):

The RealDomain:-solve command fails here.

I wonder how Maple solves it. It would be kind of Maple developers and experts to explain that.

PS. I tried printlevel:=10, but understood the output a little.

if I plot the equation (x^2-4=0) . how can I add the fixed point (-2,0),(2,0) to this curve?

daer all

how can i calculate eigenvalue and eigenvectors for a big Matrix?

example Matrix 12*12.

thank you

Here it is:

I'd like to input it as 2-D and solve for x as a function of t.