Dear All,

I am trying to add the following two equations but MAPLE doesn't give me one value i.e. either in cos or sin,  its giving me both so don't know which one to choose sin or cos:

A:= (142.3*cos(w*t))*cos(theta);

B:=(142.3*cos(w*t + Pi/6))*cos(theta+Pi/6);

C:=A+B;

expand(%)

combine(%)

Looking forward to your kind replies.

Best Regards

A.Q

The latest quick update fix for a bug is the fastest fix I have seen in a long time.  A nice surprise actually.

In my travels I happened to come across this ... "Since then, we’ve successfully released a new build of Wolfram|Alpha’s codebase each week, incorporating not only hundreds of minor behind-the-scenes enhancements and bug fixes, but also a steady stream of major new features and datasets."  taken from here

I am trying to find the complex roots of a nonlinear function within a region using Rootfinding:- Analytic. The problem is that with exactly the same function, the same parameters, etc. it sometimes finds all the roots and sometimes does not! Does anyone know why?

f1 = u1*f1 + u2*f2

f2 = u3*f1 + u4*f2

1. obviously u1 = 1 and u2 = 0 is solution, would like to see an exmaple which exist other solution?

2.

can it be seen as an matrix question such that matrix A := [u1, u2; u3, u4;];

or i should see them separately f1 = u1*f1 + u2*f2 and f2 = u3*f1 + u4*f2 ?

which Maple function calculate this?

3.

if want to determine whether [g1, g2] is member of [f1, f2], u1 = 1 and u2 = 0 can not be solution?...

I have a very strange bug with Maple 16. When I try to start it, Maple loads its shell and starts to consume 100% CPU (maple.exe, not mserver.exe). If I try to calculate something, it throws something like "waiting for server connection". In 3 to 10 minutes Maple suddenly stops doing this and then works normally until I reboot Windows. What's this? Maple 16.0, Windows XP SP3.

PS. I do not have such bugs on my home PC with Windows XP SP2.

hi all,

> e0 := -21+.7*I;
                          -21. + 0.7 I
> e2 := e0;
                          -21. + 0.7 I
> e1 := 3.9;
                              3.9
> e3 := 1;
                               1
> t1 := 10*10^(-9);
                               1    
                           ---------
                           100000000
> t2 := 50*10^(-9);
                               1    
                            --------

I am simply trying to plot three different for loops. 

> a[0] := 100;
> r := 2;
> for n to 10 do a[n] := r a[n-1]) end do;

> b[0] := 100;
> r := .5;                            
> for n to 10 do b[n] := r b[n-1]) end do;

> c[0] := 100;
> r := -1;
> for n to 10 do c[n] := r c[n-1]) end do;

The loops are calculating...

Dear Maple users

I think I got the answer once, but I don't remember: How do I plot a function, whoose values include units? In the plot below it succeeds partly. The plot is being displayed, but units not simplified. In other situations I simply get an error, although it should work. I guess it has to do with simplifying units ... I hope someone can point out how to do it ...

Erik

Hi,

I need fsolve to round down its solutions but the 'Rounding" operator doesnt work . Here's a simple example

restart;
Digits:=5:
Rounding=-infinity:
fsolve(sin(x)=0, x=2..4);

The answer is 3.1416 but I need it to return 3.1415. There also doesnt seem to be a command to obtain the nth digit of a number, aka. digit(3, 3.14) = 4 in case I wanted to write a quick procedure to round down the answer.

Any suggestions?

Thanks,

i'm using DirectSearch package to solve the following system of equations (in order to find x1a,x1c,x2a,x2c):

How can i limit the solutions just for positive values of x1a,x2a,x1c,x2c? (Currently, I'm just using  

Thanks

Gil

Hi,

     So I'm trying to animate a ball moving around in a moving circle. I can do a sequence of points, and a sequence of static circles which works okay but I'd like a continuous animation. Here is the points where the ball hits the circle (x,y) position and the times (t).  and the animation of the circle

restart;
with(plots);

x1 := [.9, -0.6953537244e-1, .5084436548, .5084436548, -.5253004431, -.4186356935,
     -.8180728424, -.8180728424,...

How can I get the correct multiset power set of a hashmset in Maple? For example for the following hasmset s I have two different answers in Maple and MuPad. I need to compute MuPad like answer in Maple:

>s := hashmset:-new( [ a, 4 ], [ c,3 ] );
                  s := table(sparse, [a = 4, c = 3])

> combinat:-powerset(entries(s));

     ...

Hi, I use Maple 13 and have this issue to solve.

In an archive.txt there is the following Vector:

-1/64*cosdincl^2*cos(2*ele-2*g-2*anom-2*w)
+1/16*sinfJ*cosfK*sindincl*cos(2*ele+g-h+om-2*anom-2*w)
-1/16*sinfJ*sinfK*cosdincl*cos(2*ele-g-2*h+2*om-2*anom-2*w)
+1/16*sinfJ*cosfK*sindincl*cos(2*ele-g-h+om-2*anom-2*w)
-1/16*sinfJ*sinfK*cosdincl*cos(2*ele-g+2*h-2*om-2*anom-2*w)
+1/16*sinfJ*cosfK*sindincl*cos(2*ele-g+h-om-2*anom-2*w)
+1/128*cos(2*ele+2*g-2*h+2*om-2*anom-2*w)

Hello,

I work at a University and we use Maple 9.5, 13, and 16.  We have had problems with 13 and 16.  In this instance the program gets stuck at

for k from -N to N do
  e[k]:=g[k]/L2norm(g[k])
end do;

We left it run for 24 hours but it will not calculate e7. The program doesn't freeze but just seems to be in an endless loop. I have tried on multiple computers with different RAM/CPU configurations.

In Maple 9.5 this program...

http://wenku.baidu.com/view/7d013c8c680203d8ce2f24ee.html

 goal is to evalute to (5.10)

restart;
with(inttrans):
with(SumTools):
r := sqrt(2*p)*exp(p*t)/(i-1)!*Diff((t^(i-1))*exp(-2*p*t),t$(i-1));
L := laplace(r,t,s);
L := int(r*exp(-s*t), t=0..infinity);

no matter laplace it or integrate it, also failed