## Anyone could tell me how to access Maple TA v.3 Ma...

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

## draw timedependent vector field trajectories?...

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)

## Separation of variables killing me!...

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

## Using Matirx equations...

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?

## Solving sin(x)>0 with Maple...

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

## Frustrating problem...

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

## problem with for loop...

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:

## Roots of degre 4 Polynomail with costant terms...

Hi everybody!! I'm looking to solve the roots of the following polynomial: Rootof(9*Z^4+(-12*x+36)*Z^3+(33-72*x-6*x^2+L^2)*Z^2 +(-2*L^2*x+36*x^2+12*x^3-66*x)*Z-3+33*x^2-3*x^4+L^2*x^2) where x 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>Z, x between [-3/2,3/2[, and 0<>

## Alternate use of Prime...

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?

## How to handle a very long Module ?...

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.

## sequences with units...

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,