Hi , how we can read the fractional differential equations in maple with out solving . I means just read and determine which is the order of fractional differential equations.

thanks

Hello everyone!

In previous versions of Maple (e.g. Maple 2016) it used to be possible to use scaletorange and colorscheme options together as in:

densityplot(sin(x+y), x = -1 .. 1, y = -1 .. 1, colorscheme = [black, red, yellow, white], scaletorange = -.5 .. .5);

But Maple 2018 returns an error:

Error, (in plots/densityplot) the scaletorange option cannot be used with the colorscheme option

Why is that and can one work around this error in any simple way?

  Y'a t-il des suggestion de résolution de ce qui suit? merci.

a) On pose F(-1,0) et F`(1,0) les foyers de l'ellipse E, on veut déterminer son équation implicite f(x,y)=0, 
    des points A(x,y) sur l’ellipse en utilisant la description bifocale et sans utiliser Maple.
  b) Utilisez la commande implicitplot de Maple et le résultat de a) pour tracer plusieurs ellipses sur
    le même graphe en variant la valeur de la constante C,(la somme des distances aux foyers F, F’ est
une constante qui est C).

Traduction:

  a) We put F (-1,0) and F` (1,0) the foci of the ellipse E, we want to determine its implicit equation f (x, y) = 0,
     A (x, y) points on the ellipse using the bifocal description and without using Maple.
  b) Use the command implicitplot of Maple and the result of a) to draw several ellipses on
     the same graph by varying the value of the constant C, ( FA +F'A = C ). 

     Give at the end a Maple procedure that generates this ellipse.

with(plottools):F := proc (N) local a, b, L; L := NULL; L := sort([op({seq(seq(a/b, a = 0 .. b), b = 1 .. N)})]); return L end proc; F(6);
            [   1  1  1  1  2  1  3  2  3  4  5   ]
            [0, -, -, -, -, -, -, -, -, -, -, -, 1]
            [   6  5  4  3  5  2  5  3  4  5  6   ]
Ford6 := proc (i) local d, k, n, r; k := i; n := numer(F(6)[k]); d := denom(F(6)[k]); r := (1/2)/d^2; return [n/d, r], r end proc; nops(F(6));
                               13
for i to 13 do C || i := Ford6(i) end do;

display(circle(C1), circle(C2), circle(C3), circle(C4), circle(C5), circle(C6), circle(C7), circle(C8), circle(C9), circle(C10), circle(C11), circle(C12), circle(C13), axes = normal, scaling = constrained, color = blue, size = [800, 800]);

Hello there,

I have created a MAPLE document in a slideshow format.

Is there a way to print a copy of my presentation with header and footer included and in a format that fits on letter format paper or pdf.

Thank you for your help.

LL

I have 2 questions here

1st I want to extend this set Ug3 := {1, 19, 23, 29} by repeatively subtracting 6 fron its elements. first pass should give

Ug3 := (Ug3-~ 6) union Ug3  Ug3 := {-5, 1, 13, 17, 19, 23, 29}

Now I dont want to add any elenments less than 6 so -5 need to go

Second pass produces

Ug3 := (Ug3-~ 6) union Ug3                Ug3 := {-11, -5, 1, 7, 11, 13, 17, 19, 23, 29}

Obiviously no elements less than 6 to be added on second pass either.

At this point there is no further elements that could be added to the set.

I am looking for an efficient method. I can use For loops and if then checks. The sets grow in length quickly. Repetition lengths are 6, 30 210, 2310,... I use sets because the numbers get ordered automaticially. Are sets efficient or should I use some form of table?
 

How I can perform integration by parts, with respect to the x[0..1],y[0..1],t 

PART.mw
 

>  >  >  >  >

 

Download PART.mw

 

with(plottools):with(plots): display(seq(seq(display(polygon([[i,j],[i,j+1],[i+1,j+1],[i+1,j]], color=`if``((j)::odd,ColorTools:-Color=magenta))), textplot([1+.5,j+.5,fprintf("%d",i*j)])),i=1..10), j=1..10),axes=none);

Hello Maple experts:

Using Maple 2018.2.1 on windows, with Physics package version 301.

There is some strange issue in parsing somewhere.  This works

r:='r'; u:='u'; t:='t';theta:='theta';k:='k';
k:=1/25;
pde := diff(u(r,theta,t),t)=k*(diff(u(r,theta,t),r$2) + 1/r*diff(u(r,theta,t),r)+1/r^2*diff(u(r,theta,t),theta$2));
bc1:= eval(diff(u(r,theta,t),r),r=1)=0;
bc2:= u(r,0,t)=0, u(r,Pi,t)=0;
ic := u(r,theta,0)=(r-1/3*r^3)*sin(theta);
sol:=pdsolve([pde, bc1, bc2, ic], u(r, theta, t),HINT = boundedseries(r = [0]));

No problem with the above, pdsolve gives solution. Now if I change k from 1/25 to 1, it gives parsing error in map

k:=1;
pde := diff(u(r,theta,t),t)=k*(diff(u(r,theta,t),r$2) + 1/r*diff(u(r,theta,t),r)+1/r^2*diff(u(r,theta,t),theta$2));
bc1:= eval(diff(u(r,theta,t),r),r=1)=0; 
bc2:= u(r,0,t)=0, u(r,Pi,t)=0;
ic  := u(r,theta,0)=(r-1/3*r^3)*sin(theta);
sol := pdsolve([pde, bc1, bc2, ic], u(r, theta, t),HINT = boundedseries(r = [0]));

Error, (in assuming) invalid input: map expects 2 or more arguments, but received 1

any K value less than one works. 

Now I change K from 1 to 2, the error goes away. But no solution. Which is OK.

Why does the map error shows up when k=1 only? Same error shows up if K is missing all togother, as in

r:='r'; u:='u'; t:='t';theta:='theta';k:='k';
pde := diff(u(r,theta,t),t)=diff(u(r,theta,t),r$2) + 1/r*diff(u(r,theta,t),r)+1/r^2*diff(u(r,theta,t),theta$2);
bc1:= eval(diff(u(r,theta,t),r),r=1)=0; 
bc2:= u(r,0,t)=0, u(r,Pi,t)=0;
ic  := u(r,theta,0)=(r-1/3*r^3)*sin(theta);
sol := pdsolve([pde, bc1, bc2, ic], u(r, theta, t),HINT = boundedseries(r = [0]));

Error, (in assuming) invalid input: map expects 2 or more arguments, but received 1

 

I have been trying to use fsolve to iteratively solve a free convection heat transfer problem for a heated vertical plate using units and the ThermoPhysicalData library.  I have received some help and have managed to get rid of the eror messages but I still can't seem to get it to solve.

Here is the code

 

 

I would appreciate help wih this.

 

Thanks

Hi

 

I've just upgraded from v2017.3 to 2018. It worked OK until I installed latest service pack 2018.2.1 (server license provided by my University). Ever since I cannot use Maple. Anything I type I get Typesetting:-mparsed(...) error and the text/command I typed.

 

I’ve contacted our software tech support and they told me to change the typesetting level from advanced to standard and it did fix the problem.

 

But why does it happen in the first place? I’m running Windows 8.1 64bit. Out tech support told me to has something to do with 3D display issue on my machine and told me to bring my laptop on Monday to see if they can resolve the issue.

 

Anyone else have this problem? Why didn’t it happen with older Maple versions? What am I missing by using standard typesetting instead of the default advanced?

Thanks

 

 

 

 

 

 

What's going wrong here?

The Matrix is created by using the Matrix Palette. 

It seems that in a matix it is not possible to use division by a noninteger. Is that right?

(I use Maple 2018.2 and this is tested on both Windows and MacOS.)

Kind regards,

Mikkel

Fract := proc (P::posint, Q::posint) local p, q; for p to P-1 do for q to Q-1 do if is((P-p)*q-p*(Q-q) = 1) then return p/q, P/Q, (P-p)/(Q-q) end if end do end do end proc:#this procedure works Fract1 := proc (P::posint, Q::posint) local p, q; `~`[`~`[`/`@op]](select(type, map2(eval, [[p, q], [P-p, Q-q]], [isolve((P-p)*q-P*(Q-q) = 1)]), [[posint$2]$2]))[] end proc:#this procedure don't work Fract(7, 81);Fract1(7,81); Fract(39, 97);Fract1(39,97); Fract(101, 143);Fract1(101,143); Fract(11, 80);Fract1(11,80); Fract(15, 37);Fract1(15,37); Fract(22, 39);Fract1(22,39); Fract(25, 37);Fract1(25,37); Fract(21, 91);Fract1(21,91); Fract(13, 19);Fract1(13,91);

is possible to solvethis equation via maple?

hank you

EQUATION2.mw
 

>  >  (1) >  (2) >    Boundary condition: >  ##################################### INITIAL CONDITIONS:   >  (3)

 

Download EQUATION2.mw