MaplePrimes Questions

In next procedure i calculated 1st derivative of H in y=0 via series approximation. And i see that some terms of series are missed. If i would raise second parameter to cnt+20 for FuncToSeries in GetLimitsArray it becomes better. But why it's not OK with even cnt+8? series_test.mw

I have the numerical solution of Phi(r,t) which is a numerical solution of a pde..

I want to find the following energy integral at fixed time say t=10 ,

Energy = int(a*r^2*Phi(r,10)^2 + 2*b*r*Phi(r,10)^3,r=0..infinity)... I could not find help in maple.. I guess I had to do the following

 

1. select the numerical solution dependent only on r at t=10 slice..

2.Use numerical methods to evaluate the integral..

 

Just try simplify :

to_zero.mw

with(Statistics):
Phiinverse := (x) -> Quantile(Normal(0, 1), x) :

evalf(Phiinverse(1-1/2^24));

and the result is 5.691523310-2.147372008*I

Now, I can get a real-valued solution to this by using the equivalent
functionality from stats instead of Statistics.

with(stats):
PhiinvClassic:= (x) -> statevalf[icdf, normald[0, 1]](x):

evalf(PhiinvClassic(1-1/2^24));

I have coded maple script and got that error. How can I fix it?

Here is my code error.mw. Please help.

Thanks

raw_panel_cuttin.doc

 Given a large rectangular wooden panel, you want to cut specific quantities of smaller rectangles from it.

Hi.

I have two complex functions with 3 variables: z1,z2,t . I need the first derivative of one of these functions with respect to one variable onle. Here is what I did:

f1:=z1(t)+2*z2(t):

f2:=z1(t)-3*z2(t):

diff(f1,z1(t)) this gives me an error. I need to write the variable as z1(t) not z1 because I'm doing some calculations for different time.

Thanks for the help.

Hello,

     I just purchased Maple and I am just learning calculus pretty much for fun.  I am reading "Calculus Made Easy" by Sylvanus Thompson.  On page 56 there is a set of equations for which I would like to know the steps.  I was wondering how to do this in Maple.  I played around with the Student and Tutor commands, but can't seem to get it to work.

     The equation is y+dy=(x+dx)^-2

 ...

hi,

how to change coordinate system? 

for example :

diff(f(x, y), x)   =   (diff(f(r, theta), r))*cos(theta)-(diff(f(r, theta), theta))*sin(theta)/r

 

thx;

aryan.

 

There i see

for advanced users, see the routines `simplify/size/size` and `simplify/size/size/object`.

How to write coorectly in maple 15 those calls? From maple 5 (it was ~10 years ago ) i hardly remmember

that f/x also could be treated as function call f  at x or smth. like that...

I am going to use maple in connection with my project concerning non-linear dynamic and chaos, but i have never used the program before, so I hope you guys can help me with that,

I have a model of non-linear dynamic system as following:

dA/dr = k + m * Y(r) - A(r) * B(r) * B(r) - A(r)

dB/dr=1/q * [A(r) * B(r) * B(r) + A(r) - B(r)]

dY/dr=1/s * [B(r) - Y(r)] 

the values of the parameters are:
k= 10
q= 5 * 10^(-3)
s=2 * 10^(-2)

simplify(expr, power, symbol, size);

- simplification by size proceeds 1st or last?

Ok, when I run the below code which maximize the risk adjuested portfolio returns
(long and short positions) in QP matrix form on empirical data I get very strange
allocations ie we go 100% or 100% short in almost all stocks except for a few
where the allocations are more appropriate like 0.2 etc.


# Maximize Risk Adjuested Return Matrix Form
# Minimize W'.Cov.W−W'.EV
# R=Return Matrix

EV := Vector([seq(ExpectedValue(Column(R, i)), i = 1 .. N)], datatype = float[8]):

if maple cannot factor something, does it mean it cannot be factored for sure?

i have a really really long univariate polynomial with coefficients that are also variables (a[0],a[1] etc), is there any tips on how to factor this monster?

thanks in advance!

well first of all this site was very useful for doing my homework, but there is still something I didnt find on it and im sure other people may find it useful.

 

I have a system of 5 ode's and 6 initial conditions that ive solved successfully and plotted the graphs i need:  Position VS Time

          Speed VS Time

The only thing I initially know is the final position, which i can read on the first graph and...

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