After reading help file on product command (Maple 12), I put in the command product(1+1/ithprime(k)^4, k=1..infinity); expecting to see the symbolic result 105/pi^4.  Instead I got back the product unevaluated.  Have I misunderstood what the product command is supposed to do?

We are going to show a roundabout but rather effective method of solving some rather complicated (definite) integrals in closed-form via a rather unusual method: a special factorization of linear ODEs.  The example we will use is a 2 week old question that has yet to get an answer.

First, the problem: compute the integral

Hi everybody

Hi everybody

p.276 from the advanced programming guide: example 2 line 11

> r := z = -3 .. 3;

                              r := z = -3 .. 3
> minz:=lhs('if'(r::range,r,rhs(r)));

Error, unable to match delimiters

I encounter a similar  problem of parsing once:
 

I thought before that &where is not  a keyword, but I don't understand the difference here (I found &where in the solutions of pdes):

restart;
f1:=a &where b;
op(2,f1);

it gives me {b}

f2:=a &something b;
op(2,f2);
 

gives me simply b

I don't find any information on &where in the help.

Hi all..

After i evaluated an answer using matrices..the resulting answer is stored in a Matrix..but im not able to see the anwers instead it displays...11 x 1 Matrix...DataType:anything....storage: Rectangular..Order: Fortran Order...wat to do to make the results display?

thanks.

I’m using maple 11. In my problem, I’ve five axioms: 

I have tried unsuccessfully to follow the help but cannot figure it out.

I am using Maple 12 Standard with Windows XP.   I found the palette "Diacritical Marks" so I can make an umlaut and a u. I have tried various combinations of Crtl+R, Crtl + Shift, Ctrl + Alt  +O but wasn't able to find the right combination.  Could someone please tell me the right key stroke sequence.  I can manage to get the umlaut over the u, but it is too high up. :-(

Thanks,

Edwin

Is there a way to generate a parametric curve that includes the orientation?  i.e. an arrow or series of arrows?

Hi,

I solved the homogeneous differential equation of a damped oscillator ((D@@2)(x))(t)+d*(D(x))(t)+k^2*x(t) = A*sin(omega*t) with maple, the output is:

x(t) = _C1*exp((-(1/2)*d+(1/2)*sqrt(d^2-4*k^2))*t)+_C2*exp((-(1/2)*d-(1/2)*sqrt(d^2-4*k^2))*t)

Now, as there is damping, the limit for t->infinity shoud be 0. I substituted:

hommod := subs(d^2-4*k^2 = Delta, rhs(l_hom))

 Then, I tried the limit(hommod, t = infinity) command for the three cases

It's been half an hour that I am looking to the example 5 and I can't figured how you can state that x run from 1 to 3 and y from 1 to 2 just by looking at LL.  If I undestand this, I will know how to write those twelve points.

Does anyone would have the patience to explain it to me?

Thanks in advance.

Mario

i am deriving lagrangian shape function symbolically for an 1-D element of order p in FEM....so the eleemnt will have p+1 nodes....

                                   N(k,i) = product((X-Xother)) / product(Xcurrent-Xother)

Hi everybody

de := diff(theta(t), `$`(t, 2))+c*(diff(theta(t), t))+9.8*sin(theta(t))/L = 0; c := 2; L := 2;
init := theta(0) = 0, (D(theta))(0) = 4;
sol := dsolve({de, init}, theta(t), numeric, output=listprocedure);
Theta := subs(sol, theta(t));
plots[animate](plots[arrow],[[0,0],[L*sin(Theta(t)),-L*cos(Theta(t))],colour=red],t=0..5, axes=none,scaling=constrained);

these lines of codes were posted by robert Israel in one of his posts.

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