I ran into an interesting situation with numeric integration.

For a simulation task I need to evaluate an overlap integral of a pair of 3-d ellipsoids which have a certain aspect ratio and the axes of which are tilted against each other. The distribution in each plane is Gaussian, but with largely differing sizes. While I have an analytic expression for the result; the integration (along a certain direction) cannot be done analytically and so I integrate numerically....

hello guys , i have an autonomous system , maple give me this warning when i want to compute its fixed points !

 

thank you for your time

 

mm.mw

Hello every one,

I am facing problem with for loop. Please have a look.

My code is

restart;with(PDEtools):

Eq1:=diff(u(eta,t),t)=C*diff(u(eta,t),eta$2):

BCs := {u(0,t)=sin(t), u(L,t)=0}:

ICs := {u(eta,0)=0}:

L:=600:

sol:= pdsolve(Eq1,ICs union BCs,numeric,time=t,range=0..L);

for i from 0 to 600 do 

for t from 0 to 3 by 1 do

for C from 0 to 1 by 0.1 do

p0[C,t]:=sol:-value (C,t):

sol[2] := [[2, 1], [3, 4]];

for i from 1 to nops(sol[2]) do

sol[2][i] := [seq(op(k,sol[2][i]), k=nops(sol[2][i])..1, -1)];

T := T + table([seq(op(k,sol[2][i])=op(k-1,sol[2][i]), k=2..nops(sol[2][i])),op(1,sol[2][i])=op(nops(sol[2][i]),sol[2][i])]);

od;

final result should be

1 2 3 4

2 1 4 3

Hello, Is there a way to assign mutiple variables at once using the 'if-then' statement?For example: if A:=3, then B:=434 and C:=52 and H:=2039So that I fill in these variables B, C and H one time and then when A is chosen to be a value, all other values are assigned automatically. Like filling in a table actually.In a simple 'if-then' statement I assign one variable, which works well.a:=10if a:=10 then b:=4elif a:=20 then b:=3end if:b ends up being 4I don't know how to add variable C and H, without getting an error.It should be very simple in my opinion, but I just don't see it.Greetings,Frank

EXCERPT  WITH  ISOLATE  QUESTION  -

 

>

Do maple have hashtable ?

i would like to use for premutation group

a := f(x,y) = f(y,x)

how to get x and y from left side f(x,y)

and get y and x from right side f(y,x)?

I got Maple 17 a few weeks ago and it has been helpful in my learning of calculus, but not as much as I had hoped.

 

I also bought the Calculus study guide which is a big disappointment. For example, I tried using the integration methods tutor for the integral  cos(5x).

The correct answer is  1/5 sin(5x) + C and is found with U-substitution. 

With the tutor, I entered cos5x into the function box.  cos(5x) does not work....

Hello, everyone. I would like to know how to use fsolve results in future commands.

I have the resulting values for the variables a,b,c,d and e and would like to use them to calculate all the X's.

Any help would be appreciated. I also uploaded the file.




Equações_H,_S_e_G_(r.mw

i have three nonlinear pde equations and i want to solve them,with any initial or boundary condition possible,can anyone help me solve them?
it is of no importnace to solve them numerially or not. 

from (x+2)^4

sys:=[a[2]*b[2] = 1,a[1]*b[2]+a[2]*b[1] = 8,a[0]*b[2]+a[1]*b[1]+a[2]*b[0] = 24,a[0]*b[1]+a[1]*b[0] = 32,a[0]*b[0] = 16];

solve(sys, {a[0],a[1],a[2],b[0],b[1],b[2]});

hello friends 
please can anyone can help me in removing error from this worksheet.
working.mw

How would one plot the intersection of the surface z=3.5 and the surface described by a matrixplot

Here is an arbitrary matrixplot surface for an example.

matrixplot([[3, 4, 5, 1, 1, 1, 2, 3, 2, 1, 7, 8], [2, 3, 4, 1, 2, 1, 2, 1, 2, 1, 2, 5], [7, 8, 7, 6, 7, 8, 4, 5, 3, 2, 1, 2], [2, 1, 2, 4, 5, 6, 5, 6, 7, 6, 5, 6], [2, 3, 2, 4, 5, 4, 5, 6, 7, 6, 5, 4], [9, 8, 7, 8, 9, 8, 9, 8, 7, 8, 9, 8], [9, 8, 7, 8, 8, 8, 7, 8, 6, 8, 7, 6]]);

In the following code, why is B returned unevaluated?

restart:
A:= a:  B:= 2:
F:= _a-> eval(`if`(A,B,C), a= _a):
F(true);
                               B
eval(B);
                   ...