How I can calculate integral?

Thanks

 

>  >  >

 

Download

Hello,

Real beginner, never used Maplw before. I want to analyse PDE's through Lie symmetry analysis -- get the infiniteeimals and then generate the invariants. I am going through the standard examples on the help within Maple, but I am stuck on a basic issue which prompts me to think that there may be something different in my version of Maple (although I downloaded it from TTU which I presume should be the latest version).

Here's what I get >>>>>

Loading PDEtools

with(PDEtools, InfinitesimalGenerator, declare);
               [InfinitesimalGenerator, declare]

declare(u(x, t));
               u(x, t) will now be displayed as u
U: diff_table(u(x, t)):
PDE := U_x,x - U_t = 0;
                    PDE := U_x,x - U_t = 0
show;
                       U_x,x - U_t = 0
Infinitesimals(PDE)
Error, (in PDEtools:-Infinitesimals) missing dependent variables

>>>>>

 

I have also tried:

Infinitesimals(PDE, u)
Error, (in PDEtools:-Infinitesimals) not a PDE system w.r.t u

and:

Infinitesimals(PDE, U)
Error, (in PDEtools:-Infinitesimals) not a PDE system w.r.t U
 

There are many other issues, but let's deal with this one first.

 

Thanks

Best wishes

Nadeem

 

 

 

Hello all, 

Would you teach me how to cancel a denominator term by multiplying the same term?

For example, I got this expression:

-L2*diff(i2(t), t) + L1*diff(i1(t), t)/n12

Then, I want to come to this expression by multiplying the expression with 'n12'

-L2*n12*diff(i2(t), t) + L1*diff(i1(t), t), 

But the result from my simple attempt was this:

(-L2*diff(i2(t), t) + L1*diff(i1(t), t)/n12)*n12

Thank you in advance!

 

Hey there, I have a pretty general question.

I'm trying to fill out the entries of a matrix. Each matrix element is the result of a very complicated calculation. Currently, I am using nested do loops (two loops total) to scan through each row and column respectively. I find that this process racks up a ton of memory, and that I in fact run out of memory before the matrix has been completely specified.

First, why is this happening? And second, what is a smarter way to perform the calculation?

 

Cheers.

Hi,

Due to an unexpected maintenance operation, I had to uninstall Maple 18 from my Windows 7-64 bit PC.

Later on I installed it without any problems but, to my surprise now I can't configure it properly. This is:

* Enabling Maple Text as Input (classical input method)
* Removing numbers from equations
* Setting Maple language to English (it took Spanish by default because of Windows)
* Hiding left panel

As usual, this is performed under Tools/Options/Interface and so on...

After I modify my preferred settings, apply globally and close-open again, the program is again in its original form.

How can I do in this case? I have installed it several times. It is also worth noting that the maintenance that I performed was related to deep Windows registry modifications. 

Thanks and regards.

 

X := [0, -3]; Y := [3, 1]; Z := [5, -2]; PP := proc (M::list, N::list, K::list) local A, B, P, distPH, H, lambda, mdist; A := M; B := N; P := K; H := simplify(expand((1-lambda)*A+lambda*B)); distPH := sqrt((H[1]-P[1])^2+(H[2]-P[2])^2); mdist := diff(distPH, lambda); lambda := solve(mdist, lambda); simplify(distPH); H end proc; debug(PP); PP(X, Y, Z);#the calculation isn't finished

Would you teach me how to collect and isolate specific terms in an equation?

For example, this is a given equation:

v1(t) - R1*(-i3(t)/n13 - i2(t)/n12) - L1*diff(-i3(t)/n13 - i2(t)/n12, t) = n12*(v2(t) - R2*i2(t) - L2*diff(i2(t), t))

From this equation, I wonder if there is a way to collect and isolate the derivative terms at the RHS, like this:

(- L1/n12+(n12 * L2))*diff(i2(t), t) + (L1/n13)*diff(i3(t), t) = -v1(t) + R1*(-i3(t)/n13 - i2(t)/n12) + n12*v2(t) - n12*R2*i2(t)

Thank you in advance!

 

Hi 

Is there a way to solve it numericall

evalf(int(exp((5+I*6)*x)*sin(1+erf(x)),x=-to..to));

evalf(int(exp((5+I*6)*x)*cos(1+erf(x)),x=-to..to));

 

Would you tell me how to achieve this?

> eqn1 := e1*i1 + e2*i2 + e3*i3 = 0
Then, 

solve( { eqn1 } , { i1 } , explicit ) ;
                     /       e2 i2 + e3 i3\ 
                    { i1 = - ------------- }
                     \            e1      / 
Then, I want to replace 'e2/e1' with this expression:

> eqn2 := n12 = e1/e2;

In other words, I want to express the following:

                       /       e2 i2 + e3 i3\ 
                    { i1 = - ------------- }
                     \            e1      / 

as this:

                      /          -i2     - e3 i3\ 
                    { i1 =  ------   + ------ }
                     \            n12        e1   / 

 

Thank you in advance!

 

Does maple has surrogate optimization built in function or some codes. Thank you

Hello,

How I can separate three functions (u__ru__theta and u__phi) in the equation attached below.

Please also see attached figure. I want to calculate L11L22L33.

Thanks.

SEPARATE
 

>  >  >  >

 

Download SEPARATE

 

Dear all,

How can I decide that the product a*n appears on the list [1-a*n*xy, x+y]? I used from the following function but the result is false.

I am looking forward to hearing from you.

Sincerely yours

i have a problem with a nonlinear equation containing Heaviside step function. fsolve does not return anything and SolveEquation command also returns incorrect answer. How can i solve this equation? any method or help is appreciated.

 

>    >  restart: >  with(DirectSearch): >  F:=x*(Heaviside(x-(S0))/(1-DD)+Heaviside(-x+S0)/(1-HH*DD)); (1) >  EQ:=F-E*Y; (2) >  HH:=0.2; DD:=0.579350262599427; S0:=1e8; E:=70e9; Y:=0.001668993263529; (3) >  EQ (4) >  fsolve(EQ) (5) >  SolveEquations(EQ) Warning, complex or non-numeric value encountered; trying to find a feasible point   (6) >  eval(EQ,x = 1.00000000000000*10^8) (7) >

 

Download fsolve.mw

Hello, I bring here a problem with maple that in result the  "".

I can remove '' in final results?

Thanks

 

>    ;   ): >    X= (R+r*costheta)*sinphi):   = (R+r*costheta)*cosphi):   Z= (r*sintheta)):      r, theta, phi,     X, Y, Z   ): >    >             (1/2*Curl                < u__rrtheta, phi),             u__thetartheta, phi),             u__phirtheta, phi)           >,           rtheta, phi         )       )     )   ); (1) >

 

Download