Hi all I'd like to construct a phase portrait of a DE system with several different solutions on one plot. To do this I've been using odeplot for each solution and then displaying each plot with display(). Now I'd like for there to be arrows on each solutions, resulting in a phase portrait which will show the direction of phase flow for each orbit, but I couldn't find a way to add arrows to each individual plot. Is there a way to do that ? If not, is there a different approach to achieve this kind of phase portrait ? Thanks LR

 

I want to write a loop, which can give me the appropriate roots of a long equation.

I have tired to use a very simple loop, but the problem is that there are multiple solutions of the equation.

I want a loop which use newton methods to give me the satisfactory roots.

The funtion which I am dealing with is of the form sigma(l).

Plz help me out.

I have attached the maple file.

I have been using MapleTA for some years and very occasionally a student wil do something which results in him/her not being able to login. On login an error message looking something like the one pasted below occurs. In every other respect and for all other users, TA is running fine. As an administrator, I cannot find a way of resetting this user account. I have used a workaround in the past of creating another user but this is unsatisfactory for large student numbers. Has anyone else experienced this issue? Is there a common cause? Is there a way to reset the student's account?

Hi everyone,

when I use:

c:=2e-6*Unit(A*s/V);

then maple answers with the unit [F]. but when I use:

epsilon[0]:=8.85e-12*Unit(A*s/V/m);

then in the middle of a large document, Maple (Version 12) ignores [m] and still gives me [F]. On a blank (new) document the same command results in correct units [m^-3 kg^-1 s^4 A^2]. The behaviour is reproducible.

anyone knows why?

cheers :-)

 

 

I want to graph a real-valued function e.g. plot y=x^2 from x=1 to 2.  There used to be a function called "plot2D". But it does not exist any more. When I call up the glossary or Help list, I get hundreds of plot-related functions - countourplot, loglogplot, etc - but not a plot for doing a real-valued function.  It is not under with(plots): 

In Advanced Engineering Mathematics there are a lot of math symbols within the text that don't execute. They're not simply an inert math statement, like Int or Diff, but rather the symbolic math used solely as text. How is this done?

Does anyone know a way of quantizing sensor data in MapleSim?

I cant figure out how to add friction to my translating block. This is an example of what I was trying I thought I would take the Translational friction component attach it to the current force line being applied (because the direction of motion can be extracted from it) and then attach the friction force line and the original force line to the block im moving. I have tried hooking this up in series and in parrallel (the picture is with the component in parrallel) Here is a picture because this is hard to follow: http://yfrog.com/eufrictionattemptj

Can I store data in a 3D Matrix in Maple ?

I'm trying to make the following question into a Maple TA question;
Find the orthogonal matrix R that diagonalizes the matrix A = .

 

I want to solve the following PDE with boundary conditions, but unfortunately I do not know the meaning of _F1 and _F2 in this stuation. Would you please help me to find these arbitrary functions?

> PDE := diff(U(y, z), y, y)+diff(U(y, z), z, z) = 0;

> with(PDEtools);

Hi,all, I found a weird problem. When I use alias of RootOf in a procedure, it seem that it cannot work correctly. The code is as following: > restart; > cf := proc (n, ir) local P; alias(x = RootOf(ir)); P := evala(Expand(x^4)) mod 2; print(P); end; >cf(4,x^4+x+1); x^4 ---------------------> should be x+1 However, when I use it in seperate commands, it works fine. > restart; >alias(x = RootOf(x^4+x+1)); >P := evala(Expand(x^4)) mod 2; >print(P); x+1 I have no idea what is wrong here Thanks Gepo

 

I want to solve the following PDE with boundary conditions, but unfortunately I do not know the meaning of _F1 and _F2 in this stuation. Would you please help me to find these arbitrary functions?

When using Threshold on an image that has been converted to grayscale is it not the same as this loop?

a:=ToGrayscale(img);

for i from 1 to Width(a) do
  for j from 1 to Height(a) do
    a[i,j] := round(a):
  od:
od:

 

 

The following program produces a plot in the 4th quadrant.

S1:=unapply(u*FresnelS(u)+((1/Pi)*cos((1/2)*Pi*u^2))-(1/Pi),u);

C1:=unapply(u*FresnelC(u)-((1/Pi)*sin((1/2)*Pi*u^2)),u);

R1:=1;

u1:=evalf(sqrt(0.4));

E1:=evalf(Pi*R1*S1(u1)+R1);

D1:=evalf(Pi*R1*C1(u1));

with(plottools);

with(plots);

c1 := circle([D1, 0], R1);

a:=evalf(Pi*R1*u1);

p1:=plots[display](plot([1+a*FresnelC(u),a*FresnelS(u)-E1,u=0..u1]),c1,scaling=constrained);

p3:=plot(0,x=-1..0);

display(p1,p3);