## MaplePrimes Questions

Hi Everybody,

Suppose I have this procedure assign to p:

>p:=MyProc(args1,args2,args3,h) statement end proc:

where h is the step size.

args1 = {ode,ic} , args2 = x(t) et args3 = t=a..b.  The output of MyProc is a list of list

I would like to do what dsolve do when you write:

p:=dsolve( {ode,ic},x(t),x(t),numeric)

and then evaluate p(2) for example.

## error plotting piecewise function...

Hello I'm trying to plot a piecewise function, only I think the plot I get is wrong. It looks like a linear function when it should be a bit more 'scattered' looking. It also goes past 900 when its max should be 63. Did I mess up the function? Plot arguements? Thanks > pLayer := proc (x) options operator, arrow; piecewise(1

Hello everyone,

I'm having a little trouble getting Maple to return a correct solution.  It's a simple equation, really, involving the relation of the period of an object around the sun and it's semi-major axis.  Specifically this involves Halleys comet.

Given that halleys comet takes 76 years to complete an orbit.

I set

restart;

eq1:=P^2=(4*Pi*a^3)/(G*M);

and convert P to seconds

P:=convert(76,units,year,second);

G:=6.672e-11;

M:=1.99e30;

solve(eq1,a);

## How do I make full simplification of expressions?...

I am using Maple 12.

I often try to simply expressions, but I found that very often I must manually guide the simplification procedure.  For example a result from inverse laplace trasformation is:

Ssi(t)+pi/2

But this, by definition, equals Si(t).

However, the function simplify doesn't work for such a purpose.  Also in many other cases the function 'simplify' don't work without human guide.

## How could i calculate the following equation in Ma...

when i calculate the equation as:

solve({g*(w-c)+(1/4)*(a-g*w+g*r)^2/(b*(p-k))-(a-g*w+2*g*r)(a-g*w+g*r)/(2*b*(p-k)) = 0}, {r})

i got the message "Warning, solutions may have been lost" without any feedback,

does the equ too complex to calculate in Maple? or i make some mistakes?

how should i do to solve this equation~

ths

Hello Odd question, I have a vector and I'm wondering if theres a easy way to get bit level access (to specific bits) on the elements. I guess I could have a vectors inside of vectors but it seems wasteful since I also have other operations that arnt at the bit level. Thanks

## 2nd Derivative problem with Maple 12 Student Editi...

hi, if i run the below statements, the last 2 cause Maple 12 Student Edition to chug along for a minute then generate a very long answer, like a page worth. it's like it can't figure out the answer and dumps a bunch of garbage. all i am trying to do is a 2nd derivative. restart; dist := t-> sqrt((-27-(60+23*sin(t))*t/sqrt(2))^2+(-11*t+(60+23*sin(t))*t/sqrt(2))^2); 'dist(t)' = dist(t); Ddist := D(dist); 'Ddist(23/60)' = evalf(Ddist(23/60)); tmax := fsolve((D(Ddist))(t), t = 0 .. 1); 'Ddist(tmax)' = evalf(Ddist(tmax));

## License file no longer valid...

After updating my PC to Windows XP SP3 Maple no longer runs. A box with the message: "

License server does not support this feature

Feature: Maple 11

FLEXlm error:-18,147

appears and Maple does not start. Maple worked fine before SP3 update.

Does anybody have the same problem? Any idea about how to fix this?.

## Too long multivariable polynomial...

I work with multivariable polynomials, and the Maple answer is very long. When I want to print the worksheet (document mode), the long formulas are truncated. How can I force Maple to do a linebreak? For example at the 72nd position.

Sandor

## Bug(?) in webpage...

My login is rejected and I need a new password, again, and again.

I tried it under

Windows Xp- Firefox2.16, Firefox3, IE7, Opera9

Linux(Ubuntu)-Firefox2.14, Opera9

Since it is very uncomfortable I ask help, idea, suggestion.

Many thanks in advance and sorry a little bit off-topic.

Sandor

## Carrying units within a procedure...

To all,

I am trying to plot a procedure phi(beta, x) which uses dimensional units (length).  The code listed below returns an error message regarding "invalid units".  I have redefined the standard units to report length in inches, but I don't see why this should prevent me from plotting the procedure over a range of x (the procedure works when the arguments are specified discretely.  Thank you for your assistance.

Define constant beta:

## can i use maple without interface?...

how can i use maple without the interface?

i mean.. i have to use maple in a remote pc and the connection is a problem it become slow

thanks matteo

## assistance...

I need mentorship and material that is going to assist me in how to use maple.