Hi everyone!

  I have something I would like maple to compute for me, but I am not sure how to enter it.  Here is the situation:

 

I have 4 equations with 5 unknowns.  I would like maple to solve for 4 of the unknowns.  Eventually I need 1 unknown in terms of just one other unknown.  An example would be

 

0=a₀+a₁+2a₂                     eq(1)

Specifically, the summation, product and limit expressions aren't displaying their indicies/limits correctly. Instead of sitting on to and directly below the symbol, they are mashed in the center. No idea why.

Maple gave the following answer

x=RootOf( _Z^2*a+1, label=_L1)*b

Does it mean that

(x/b)^2*a+1=0 ?

Thanks.

 

I tried to use the Statistics package to compute an expected utility, which is the mean of the product of a utility function u and a random variable f.

E.g. I have a random variable, which is binomial distributed and a utility function: u:=t->-exp(-a*t);

How do I tell Maple to compute the Mean of that product of a random variable and a utility function (i.e. to compute the expected utility)?

Anyhow, if someone knows a more efficient way, I´d also be glad to hear your suggestions.

Thanks for helping.

 

 

I tried solving a system of PDEs in composite domain (see the attached image below), but couldn't get pdsolve to work for some reason. The error I got is: "Error, (in pdsolve/numeric) initial/boundary conditions must be defined at one or two points for each independent variable."

Would someone please let me know what I did wrong?

Hi

I want to simplify sin(x)/cos(x) to tan(x).

i have tried command simplify(sin(x)/cos(x),trig);

and

trigsubs(tan(x))[4] = sin(x)/cos(x)

(wrong way round)

rgds

I tried the following:

u1:=t->-exp(-a*t);
h1:=t->piecewise(t < 0, 0, binomial(n, t)*p^t*(1-p)^(n-t));
k1:=t->piecewise(type(h1(t), And(realcons,Not(infinity) ) ), h1(t), 0);
 

add(k1(t)*u1(t),t=-infinity..infinity);  [didn´t work. maybe 'add' kann only compute a finite number.]

First question: => How am I going to compute an EV, i.e. the sum from -infinity to infinity?

 

Next I tried:

Hi.

I have a problem with sketching the surface with maple.

The question is Let S be the union of the two smooth surfaces S1 and S2, where S1={(x,y,z) I x^2+y^2=1, 0<=z<=3-sqrt(3)} (I just want to make sure z is bigger than or equal to 0 and smaller than or equal to 3-sqrt(3)) and S2={(x,y,z)l x^2+y^2+(z-3)^2=4, z >= 3-sqrt(3)} (z is bigger than or equal to 3-sqrt(3)).

Use symbolic algebra software to sketch the surface S.

Hey guys i am currently attempting to do some modelling with maple, i need to solve a PDE system, i am using the following code and am confused with the error i'm getting. restart: M[Star]:=2*10^30: M[planet]:=2*10^27: q:=(M[planet])/(M[Star]): g:=sqrt((R-a)^(2)): H:=0.0333*R^(1): Delta[p]:=H: Alpha := unapply(piecewise(R <> a, 6.67*q^2*10^(-11)*M[Star]*(a/Delta[p])^4/(2*R), R = a, 1), R, a)

Hi.

I defined the following functions:

 

Hi there,

 

I'm using Maple 13.02 on Windows 7 64-bit.

I get the error message Error, (in plot) type `has_unit` does not exist every time I try to make a plot.

Example:

plot(x^2,x=-1..1) gives this error.

 

Dou you know what's wrong?

 

Have a nice day!

H.C., Denmark.

With the help of maple, how could I solve this one? Determine all values of c guaranteed by the Mean Value Theorem for
f (x) = 2 x^5 + x4^ - 3 x^3 + x^2 - x - 1 on [ - 1, 1].

Hello,

I have about 30 equations, let's call them S_i

I want to plot them. Each S_i is defined for some x between x_i and x_i+1

In other words, i want to plot:

S₀  for x₀ < x < x₁

S₁  for x₁ < x < x₂

S₂  for x₂ < x < x₃

S₃  for x₃ < x < x₄

... all the way to i=29

How do I select multiple non-contiguous lines of text (or math).  I have tried cntrl-slect, shift-select, anything I can think of -select with no success.

Thanks in advance.

Hello,

I've performed the exact same calculation (using the exact same worksheet, with absolutely no changes made) last night and today and got these results:

y=[0, .4646313991, .9499094532, .5799050874, .1092604065, .4031507404, .8483735670, .6138799333, .1913933456, .3724618402, .7707837830];

y=[0, .4646313991, .9499094532, .5799050874, .1092604061, .4031507404, .8483735643, .6138799354, .1913933461, .3724618343, .7707837938];

 

Which are exactly the same modulo the last 3 digits.

Digits=10 in both cases.