I am dealing with a problem in engineering mechanics, but my when using maple to solve the governing nonlinear equation with 4 bcs, I meet with error. 

Error, (in dsolve/numeric/bvp) initial Newton iteration is not converging

my code is :

deq := diff(y(x), `$`(x, 4)) = -.364*(diff(y(x), x))^2*(diff(y(x), `$`(x, 2)))+1.74*10^(-7)

bc := y(0) = 0, (D(y...

I have a collection of functions defined either in terms of a single variable - call it r - or in terms of (r and) the other functions of r.

To be more specific, there are two free functions B(r) and N(r), a function theta defined in terms of N(r) and B(r) (and their derivatives) and r, and a free function V(theta).

Finally I have a function, call it f, written in terms of B(r) and N(r) (and their derivatives), r, and V(theta) and its derivatives with respect to both theta and r.

How to convert Maple code to Matlab ?

comment je doiy faire pour convertir mon code Maple en Matlab?

merci d'avance pour votre aide.

Cordialement.

Hi,

I am trying to get maple to "simplify" the product of two infinite sums, according to Laurent's condition, as follows:

Given two Fourier series expansions,

F = sum{h=-inf..inf, f(h)*exp(i*h*x)}

G = sum{s=-inf..inf, g(s)*exp(i*s*x)}

Their product may be written as F*G, and then simplified as follows:

F*G

= sum{h=-inf..inf, f(h)*exp(i*h*x)} * sum{s=-inf..inf, g(s)*exp(i*s*x)}

= sum{h=-inf..inf, sum{s=-inf..inf, g(s...

conisder

>eq1:=n=(k[f1]^3+k[f2]^3)/6/Pi^2;


> eq2:=el*V=h_bar^2/2/m*(k[f2]^2-k[f1]^2);


> eq3:=solve({eq1,eq2},{k[f1],k[f2]});

> eq4:=allvalues(eq3):

Solving this i get a very very massive result. Let me take a branch:

eq5:=subs(eq4[2],k[f1]);

I get

1/h_bar*(-(1/2*n*Pi^2*h_bar^3/el/V/m+1/2*...

May I obtain, with Maple, an answer, true or false, about general questions of Logic and Set Theory?

i.e. Without constructing a Set, I want to know if is it true or false, that "if A is a subset of B and B is a subset of C then A is a subset of C".

Thanks in advance

Angelos58

What is the next two terms for this pattern...

1, -2, 2, -4, 0, ...

I'm trying to plot and fill the area between these two curves from x[0,450]

line1:=20-0.05*x

line2:=2+0.0002*x^2

I can do it separately but when I do them together, it gives me extra area that isn't shared between the two curves.

Also, whenever I try to plot them together I get the following error message:

Error, (in plot) unexpected option: 2+0.2e-3*x^2

Any help will be greatly appreciated!

hi guys,

say i have an expression like this:

Hi,

I want to solve this  fractional differential system in maple please help me.

                          (alpha)
                         D        y[0](x) = 0

I have a question regarding vectors and functions.

I have a function that depends on the magnitude of some vector k, whose dimension I do not know so let's assume it can be n-dimensional. How can I define such a function and proceeed manipulate it...partial differentiation, integration, addditions etc?

thanks for the help

Hi:

i am trying to pick off some terms programatically from a list of expressions/equations, and am having some trouble.

consider:

> select(has, y+3*x(t), x); # works
                                               ...

Hi:

I am having trouble with the Physics[diff] operator.

restart:
with(Physics):

#Setup noncommutative operators:
Setup(noncommutativeprefix = {P, H, rho});
              [noncommutativeprefix = {H, P, rho}]

#this works:
diff(P(t),t);
                    
#even more complicated stuff works:

I am right now attempting to install Maple16, and somewhere in the installation process the following appears to be happening: "installing... THBI_____.ttf". This something then proceeds to be installed for more than half an hour, at which point I stopped the installation process. Is this supposed to take super long or might something be wrong here? 

An example:

evalf(frac(10^2*exp(1)));

0.8281828

Two digits lost.

And here is even worse:

evalf(frac(10^9*exp(1)));

0.

Correct unswer:

evalf[20](frac(10^9*exp(1)));

0.4590452354

The correct answer