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:

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

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.

I'm solving a differential equation in a region of appearing and disappearing potential energy, hence there is a piecewise function in the PDE w.r.t. time. The potential disappears randomly, and I need to generate a set of random times about a mean that I can put into the piecewise function to achieve this. What is the best way of generating random numbers modelled by a Poisson distribution so they can be fed into a function? Any help appreciated, Ryan

Hello everyone (new here, nice place).

I'm working through the Introductory Programming Guide in the 'Manuals' section of the online Help in Maple 13.0 and so far the soup has been at a satisfactory temperature but now I've run into a problem using the backslash as an Escape character as in the examples at 'Special Characters in Names' in '2.2 Tokens' subsection 'Names'.

Specifically I can't make the example

`a\'b`;

Hi

Does anyone know how I can shade say the top 5% of a frequency plot. Imagine the frequency plot is generated in the following way:

 

with(Statistics):with(plots):
N := RandomVariable(Normal(0, 1)):
A := Sample(N, 500):
Q := FrequencyPlot(A, thickness = 3):
 

I thought

P:=FrequencyPlot(A,x=-3..-1,fill=true,colour=grey):
display(P,Q):

would work but no!

any good ideas??

thanks v much

Dear all,

 

I am dealling with an integral with changing lower limit:

int((k(1-x+.3*x*ln(x))+a)^2,x = s .. 1)

where k , a are constant and s<1.

 

When I input this in maple, I got the figure but I still can be get the integration.

Can anybody help me? Thanks.

Hi all, I need to change 'R' values in my torus given by with(plottools); with(plots); display(torus([0, 0, 0], r,R)) to one with an array of R values that are actually gaussian radius values that peak at R. I have these R values from Monte Carlo methods. I mean rather than having a strict R, I want it to peak at R with some distribution around R. Thanks

Dear MapleUsers,

 

I was trying to run this couple of instruction copied below, but I cannot obtain any result. Did I forget to include some package?. I am using Maple 10.

In the FIRST case I get a message:

        Error, (in simpl/min) arguments must be of type algebraic
       Plotting error, empty plot
 

In the SECOND case the error message is:

 

      Error, (in unknown) invalid argument