I am having difficulty with the contourplot3d.  When I hit enter it comes back with a blank plot.  Either Im doing somthing wrong or my machine can't handle it.

Hi,

The system below is successfully solved by using rfk45_dae method

I want to write the Runge Kutta scheme according to rfk45 method so as to have

S'=F(x,U,S,..), U'=G(x,U,S,..), ...

The presence of diff(S,x,x) in the second equation doesn't help me to definie F and G functions.

Thanks for your help 

restart;

with(plots);

Eq1 := diff(f(eta), eta, eta, eta)+f(eta)*(diff(f(eta), eta, eta))-(diff(f(eta), eta))^2-M^2*(diff(f(eta), eta))+B(f(eta)*(diff(f(eta), eta, eta))*(diff(f(eta), eta))-f(eta)^2*(diff(f(eta), eta, eta, eta))) = 0;

Eq2 := (diff(theta(eta), eta, eta))/Pr+f(eta)*(diff(theta(eta), eta))-2*(diff(f(eta), eta))*theta(eta) = 0;

Pr := 1

M := 1

S := 0

epsilon := 1

blt := 10

bcs1 := f(0) = S, (D(f))(0) = epsilon, (D(f))(blt) = 0;

bcs2 := theta(0) = 1, theta(blt) = 0;

L := [0, .2, .4, .6, .8, 1.2];

for k to 6 do R := dsolve(eval({Eq1, Eq2, bcs1, bcs2}, B = L[k]), [f(eta), theta(eta)], numeric, output = listprocedure); X1 || k := rhs(R[3]); X2 || k := rhs(R[4]); Y1 || k := rhs(R[5]); Y2 || k := -rhs(R[6]) end do:

print([(X2 || (1 .. 6))(0)])

Consider the equation

eqn1:=5^(2*abs(y-1)+2) = (1/15625)*625^abs(y-1);

and note that

eval( eqn1, y=-3);
eval( eqn1, y=5);

both return valid solutions. So why does

testeq(eqn1);

throw a numeric exception.

Given the manual description of testeq(), I would expect it to return either true or FAIL - but not a numeric exceprion!!!!

Any ideas?

Hi there,

I've created some nice 3D-plots. I want to export them and insert them in LaTex. Exporting to EPS gives me a zero-byte-file but no printable data.

I've already read that I'm not the first to have this issue and there is obviously a work-around by enabling the Classic-Worksheet-mode. Unfortanely this mode appears to be not available in Maple 17 under MAC OSX. 

Is there another way to solve the problem?
Would help me a lot.

Thanks!
 

Hi there,

I used to work with Maple 15. In Maple 15 the input-font-color was a beautiful plain red. Now I have to work with Maple 17, where the font-color was changed to a way darker red. 

I found a way to change the color in a single worksheet with Format-->Character-->Color. But I want to change it globally and permanently, so that every time I create a new worksheet the color is automatically red.

Do you have any ideas how to get this managed?

Thanks a lot!

Hi, is it possible to instantly start the display of plot animations after they are generated in maple? I searched for answers in the documentation and on the internet but couldn't find a solution. I would like to skip the step of manually clicking the plot and the "play animation" button.

Hi,

  Suppose I have a file, 1.mw, which includes a subroutine

aver:=proc(a,b)

  local res;
  res:=(a+b)/2;

  return res;

end proc:

   Now I am writing another file, 2.mw. I would like to load the subroutine, aver, in 1.mw. How shall I write in 2.mw to use that subroutine in 1.mw?

Thank you very much

PS,
PiFast43 is freely available at,

http://numbers.computation.free.fr/Constants/PiProgram/pifast.html

i dont know what`s wrong with it help me guys

Hello everyone,

I want to inseret a text arrow in the graph obtained by plot command to show increasing or decreasing trends of the graph, but I could not find any option to insert the textarrow or textbox in the graph. 

Thanks in advance.

Dear's, I am facing some problem to find the particular solution please find the attachment.

Help-1.mw

PhD (Scholar)
Department of Mathematics

I'm trying to add a label to a plot and need the derivative to be represented as a dot. My typesetting rules are set to extended, and it works in a worksheet but not in the plot. See attached image. The code to generate it is:

#the output is shown with a dot over phi
diff(phi(t),t);

#derivative in label not shown as a dot
plot(sin( t), t=0..10, labels=["t", typeset(diff(phi(t),t))], labeldirections=[horizontal, vertical]);

any ideas?

thanks

EDIT:

this seems to work... ( i will leave this question here as it might come in handy to someone else).

plot(sin( t), t=0..10, labels=["t", Typesetting:-Typeset(diff(phi(t),t))], labeldirections=[horizontal, vertical]);

Is it a bug that using the first variant does not work? any ideas from the experts?

hi,

I am trying to implement some data-intensive algorithms like: comuting similarity scores, clustering etc. How efficient Maple is in doing these operations? I mean is it comparable to MATLAB in these operations? What toolboxes are useful in these? I am trying to build a recommender system.

I am using Maple18 and not sure if Maple has any advantage in implementing these type of algorithms over MATALB??

thanks

siba