Hi,

I get the error in the following code

restart:

gama1:=0.01:

zet:=0;
#phi0:=0.00789:
Phiavg:=0.02;
lambda:=0.01;
Ha:=1;


                               0
                              0.02
                              0.01
                               1
rhocu:=2/(1-zet^2)*int((1-eta)*rho(eta)*c(eta)*u(eta),eta=0..1-zet):

eq1:=diff(u(eta),eta,eta)+1/(mu(eta)/mu1[w])*(1-Ha^2*u(eta))+((1/(eta)+1/mu(eta)*(mu_phi*diff(phi(eta),eta)))*diff(u(eta),eta));
eq2:=diff(T(eta),eta,eta)+1/(k(eta)/k1[w])*(-2/(1-zet^2)*rho(eta)*c(eta)*u(eta)/(p2*10000)+( (a[k1]+2*b[k1]*phi(eta))/(1+a[k1]*phi1[w]+b[k1]*phi1[w]^2)*diff(phi(eta),eta)+k(eta)/k1[w]/(eta)*diff(T(eta),eta) ));
eq3:=diff(phi(eta),eta)+phi(eta)/(N[bt]*(1+gama1*T(eta))^2)*diff(T(eta),eta);
      /  d   /  d         \\   mu1[w] (1 - u(eta))
      |----- |----- u(eta)|| + -------------------
      \ deta \ deta       //         mu(eta)      

           /             /  d           \\               
           |      mu_phi |----- phi(eta)||               
           | 1           \ deta         /| /  d         \
         + |--- + -----------------------| |----- u(eta)|
           \eta           mu(eta)        / \ deta       /
                                /      /                        
                                |      |                        
/  d   /  d         \\     1    |      |  rho(eta) c(eta) u(eta)
|----- |----- T(eta)|| + ------ |k1[w] |- ----------------------
\ deta \ deta       //   k(eta) |      |         5000 p2        
                                \      \                        

                                /  d           \
     (a[k1] + 2 b[k1] phi(eta)) |----- phi(eta)|
                                \ deta         /
   + -------------------------------------------
                                          2     
         1 + a[k1] phi1[w] + b[k1] phi1[w]      

            /  d         \\\
     k(eta) |----- T(eta)|||
            \ deta       /||
   + ---------------------||
           k1[w] eta      ||
                          //
                                      /  d         \
                             phi(eta) |----- T(eta)|
          /  d           \            \ deta       /
          |----- phi(eta)| + ------------------------
          \ deta         /                          2
                             N[bt] (1 + 0.01 T(eta))
mu:=unapply(mu1[bf]*(1+a[mu1]*phi(eta)+b[mu1]*phi(eta)^2),eta):
k:=unapply(k1[bf]*(1+a[k1]*phi(eta)+b[k1]*phi(eta)^2),eta):
rhop:=3880:
rhobf:=998.2:
cp:=773:
cbf:=4182:
rho:=unapply(  phi(eta)*rhop+(1-phi(eta))*rhobf ,eta):
c:=unapply(  (phi(eta)*rhop*cp+(1-phi(eta))*rhobf*cbf )/rho(eta) ,eta):
mu_phi:=mu1[bf]*(a[mu1]+2*b[mu1]*phi(eta)):

a[mu1]:=39.11:
b[mu1]:=533.9:
mu1[bf]:=9.93/10000:
a[k1]:=7.47:
b[k1]:=0:
k1[bf]:=0.597:
zet:=0.5:
#phi(0):=1:
#u(0):=0:
phi1[w]:=phi0:
N[bt]:=0.2:
mu1[w]:=mu(0):
k1[w]:=k(0):

eq1:=subs(phi(0)=phi0,eq1):
eq2:=subs(phi(0)=phi0,eq2):
eq3:=subs(phi(0)=phi0,eq3):

#A somewhat speedier version uses the fact that you really need only compute 2 integrals not 3, since one of the integrals can be written as a linear combination of the other 2:
Q:=proc(pp2,fi0) local res,F0,F1,F2,a,INT0,INT10,B;
global Q1,Q2;
print(pp2,fi0);
if not type([pp2,fi0],list(numeric)) then return 'procname(_passed)' end if:
res := dsolve(subs(p2=pp2,phi0=fi0,{eq1=0,eq2=0,eq3=0,u(1)=lambda/(phi(1)*rhop/rhobf+(1-phi(1)))*D(u)(1),D(u)(0)=0,phi(1)=phi0,T(1)=0,D(T)(1)=1}), numeric,output=listprocedure):
F0,F1,F2:=op(subs(res,[u(eta),phi(eta),T(eta)])):
INT0:=evalf(Int((1-eta)*F0(eta),eta=0..1-zet));
INT10:=evalf(Int((1-eta)*F0(eta)*F1(eta),eta=0..1-zet));
B:=(-cbf*rhobf+cp*rhop)*INT10+ rhobf*cbf*INT0;
a[1]:=2/(1-zet^2)*B-10000*pp2;
a[2]:=INT10/INT0-Phiavg;
Q1(_passed):=a[1];
Q2(_passed):=a[2];
if type(procname,indexed) then a[op(procname)] else a[1],a[2] end if
end proc;
#The result agrees very well with the fsolve result.
#Now I did use a better initial point. But if I start with the same as in fsolve I get the same result in just about 2 minutes, i.e. more than 20 times as fast as fsolve:

Q1:=proc(pp2,fi0) Q[1](_passed) end proc;
Q2:=proc(pp2,fi0) Q[2](_passed) end proc;
Optimization:-LSSolve([Q1,Q2],initialpoint=[6.5,exp(-1/N[bt])]);


proc(pp2, fi0)  ...  end;
proc(pp2, fi0)  ...  end;
proc(pp2, fi0)  ...  end;
              HFloat(6.5), HFloat(0.006737946999)

the error is :

Error, (in Optimization:-LSSolve) system is singular at left endpoint, use midpoint method instead

how can I fix it.

Thanks

Amir

How to draw an object in 3d which is like a spring

3 layers of circle already enough

Who was the creator of Maplesoft?

A friend asked me a question and I didn't know the answer to give him. So I decided to share the question with you guys. According to him, Is there an inbuilt function in maple that we can use to specify "time" on a worksheet/document? What the time does is to run or execute the worksheet/document at the time stipulated. Meaning in his absense, he wants maple to run a particular worksheet at a particular time which he will decide.Hope my question is sensible?

Or I didn't get something right? This is with Maple 16.02 on a Mac:

> for i from 1 to 10 while i<=5 do print(i) end do; #works all right
> for i from 1 to 10 while i>=5 do print(i) end do; #nothing shows up?

M5 :=series((1+1/(2*a^2)+(1/2)*b^2-1/(2*a))^a, a=0,3);

there is a variable b too

M6 := 1+(-ln(2)-2*ln(a))*a+(-1+(1/2)*(-ln(2)-2*ln(a))^2)*a^2;
with(gfun):
seriestoratpoly(series(M6, a, 4), ['egf']);

A little late in the game, with no Maple 18 wishlist yet I'd like to get it started

granted all wishes for previous versions not yet applied should still, hopefully, be under consideration.  

1 - The abitlity to angle x-axis labels.

2 - Textplot option for text to rotate with graph as it is rotated.  Currently all textplot texts are held to the horizontal

Thanks to the community through Maplesoft Mapleprimes that could develop in Computational Mathematics Achievement Day at our institution.

I'm trying to solve the following inequality:

ln(x+1)<x^2-1

but the solve command returns:

"Warning, solutions may have been lost"

Can someone halp me?

Thank you.

Carmelita

u := x -> Int(exp(-(xi-x)^2)*exp(xi), xi = -infinity .. infinity, method = _d01amc);
evalf(u(0.));

gives an error

u := x -> Int(exp(-(xi-x)^2)*exp(xi), xi = -infinity .. infinity);
evalf(u(0.));

2.275875794

u := x-> Int(exp(-(xi-x)^2+xi), xi = -infinity .. infinity, method = _d01amc);
evalf(u(0.));

2.275875794


A bug is suspected...

I have exported Maple code as a Maplet file.  When I click on the file Maplet Launcher opens but nothing "runs".  It looks like it's trying because the icon flashes, but no window opens.  The Maple worksheet from which the Maplet was generated runs fine.

Any suggestions as to how to get Maplet Launcher to run my Maplets?

Thanks,

Rollie

Good afternoon sir.

I request your kind suggestion to the above cited query.

With thanks & Regards

M.Anand

Assistant Professor in Mathematics

SR International Institute of Technology,

Hyderabad, Andhra Pradesh, INDIA.

Hi everyone.

i want to undestand how to use the passing by reference in Maple i do this:

generate_x := proc (x)

    x := (rand(1 .. 10))()

end proc;

generate_y := proc (y)

    y := (rand(1 .. 5))();

    print(y)

end proc;

print_xy := proc ()

     local x, y;

     generate_x(x);

     print(x);

     generate_y(y) end proc;

print_xy();

#print(x)  works but generate_y(y) doesn't print the value of y.

Can you help me to understand WHY i dont get the print of y.

Thanks and happy christmas to you!

Hello,

Is it possible to have the labels of the x-axis and of the tickmarks above the axis?

Thank you!