I wonder who could help me to became a Maple TA v.3 Beta_Tester?
Thanks in advance
Ivan Weinem
iweinem@yahoo.com.br

Hi, I'm new to maple and I would like to draw a plot of a time-dependent 2D Vectorfield and some trajectories:
1. I have the field

udep := (x, y, t) -> cos(t)*x - sin(t)* (-y);
vdep := (x, y, t) -> sin(t)*x + cos(t)* (-y);
it looks like this:

2. now i would like to draw a trajectory T that has at every point a tangent parallel to the field (to show the path of a massless particle inside this field)

Hi,
Separation of variables has been driving me nuts again,
By applying the method of separation of variables solve:
ux + uy =0
Separate the variables:
fp1 := diff(u(x, y), x) = -(diff(u(x, y), y));
pdsolve(fp1, u(x, y));
u(x, y) = _F1(y - x)
is this the correct solution? u(x,y):= _F1(y-x)
If it is, what is the _F1?
If it is not the solution can someone explain the correct solution to me?
Regards
malt

I wonder if someone could help explain to me how to use Matrix equations. Suppose A is a 3x3 matrix of constants, b a 3 vector of variables (x,y,z) and c a 3 vector of constants. The equation A.b = c is really 3 equations in x y z. Is it possible to extract those equations from the matrix equation A.b = c? I explain my question more clearly in the uploaded worksheet.
Thanks
The link can be found in the

File Manager
Vie
There is a discontinuity at 0, but discont gives no answer:
discont(1/sin(abs(x)),x);
Any idea?

How can one solve this simple inequality with Maple?
I've tried :
solve(sin(x)>0,x);
and Maple gives no solution.

Has someone encountered a message from maple "A problem was encountered during the save. The output file may be incomplete." This happens to me several times. While editing a maple code and saving the changes, the message pops up. True enough, when the file is reopened most of the code is gone. Even the original file that works before is now unusable. Turning off the autosave as suggested by t/s does not work. Saving the with another name does not work. Appreciate assistance from anyone.
thanks
P.M. Velez

hi;
I'm written program of composite midpoint in this general form:
int(f(x),x=a..b)=2*h*(sum(f(x[2i]); h=(b-a)/(2m+2)
the function is:
f(x)=1/(2+x^4); a=0; b=1;
and all the given inside the program
and I wretten the program but i have problem , Iwant compare between the approximate vales and the exact value
this is the program: (doing in maple9.5)>>
> restart;
> f:=x->1/(2+x^4): a:=0: b:=1:
> EI:=int(f(x),x=a..b):
> EI:=evalf(EI);
> for k from 1 to 3 do
> n:=2^k*10:
> h:=(b-a)/(n+2):
> m:=n/2: s:=0: end do;
> for i from 1 by 2 to n do
> x:=a+(i-1)*h:
> s:=s+f(x):
> I(k):=2*h*s:

Hi everybody!!
I'm looking to solve the roots of the following polynomial:
Rootof(9*Z^4+(-12*x[1]+36)*Z^3+(33-72*x[1]-6*x[1]^2+L^2)*Z^2
+(-2*L^2*x[1]+36*x[1]^2+12*x[1]^3-66*x[1])*Z-3+33*x[1]^2-3*x[1]^4+L^2*x[1]^2)
where x[1] and L are constant terms.
Is there a analytical solution, knowing that I'm working in real domain with Z between ]-3/2,3/2], x[1]>Z, x[1] between [-3/2,3/2[, and 0<>

Its common in textbooks when dealing with the subject of transformation of coordinate systems to used primed coordinates, e.g. x' y' x'. MAPLE tends to interpret primes as derivatives. Is there any way to tell MAPLE that these primes represent different variables, not derivatives?

Hello,
I have written a long Module with around 30 procedures (in Linux RedHat, Maple 10.03)
it becomes cumbersome to write and edit it, especially everytime I modifie something, because the Java environment takes a long time to display when the execution group is so big. Is there a way to break a module into smaller pieces? Maybe call sub-modules written elsewhere?
Thannk you for your help,
Al.

Is it possible to define sequences or lists etc with units??
t:= (seq(100[s]..2000[s],100[s]));
and
t:=seq(100[s],200[s],300[s]);
flag an error.
if not is it possible to define the sequence, how can you append the units after a calculation.
I want to perform the same calculation using units w/ one of the parameters varying to produces a list of calculated outputs all w/ units. Possible? Easy?
e.g. v=d/t simple enough. well how can I generate
a series of outputs from the above time sequences at a fixed distance d that spits out the velocities with units of m/s?
Thanks,

Already posted this in my previous thread, but as it is different from the initial topic thought I would post it seperately
So I'm playing with integer series and polynoms and it looks like Maple makes mistakes !!
What am I doing wrong in below sheet ?

View 3284_test2.mw on MapleNet or

Download 3284_test2.mwView file details
The result provided by Maple is obviously wrong as all these functions should be positive.

I am having problems replicating the results from a theoretical physics paper from 1968. The paper deals with how lasers behave in certain material types, in this case nonlinear optical materials.
But on to the maths, I'm trying to solve a couple of integrals but it would appear that they are very badly behaved with quite horrid results when i compare the plots to the plots in the paper. I have resorted to using Int to try and solve them numerically which sort of works, but using either numerical or analytic methods maple cannot give an answer for some values of parameters and just sits there for hours trying to solve it.

I have to maximize:
Max P: 3.35a+3.55b+3.85c-2.6d
under the folowing constraints:
a,b,c,d>0
a+b+c+d=1
d=0.016a+0.016b+0.04c
while minimizing:
0.002a+0.0212b
under the constraints:a,b>0 and a+b