Hello all together,

defined is a curve C by the function:

x^(2/3)+y^(2/3)=a^(2/3)

Now i have to convert the description of the curve in the parametric representation and plot the graph.

My problem is, how i should handle the a in the function?

Thank you very much,

Josef

i am modeling a simple standing wave. i have created three plots y1, y2 and y and then i am using animate to move them. the problem is that i cant add a legend describing every plot and i am not getting how to do this.

in addition when i click on the plot and then go to the legend menu, both show legend and edit legend are disabled.

here is my code

with(plots): y1:=0.01*sin(Pi/2*x-40*Pi*t);

                 y1 := -0.01 sin(-1/2 Pi x + 40 Pi t)

Hello, I cannot import a 4 Mb file   (https://skydrive.live.com/redir.aspx?cid=8fc13b21d305c1b2&resid=8FC13B21D305C1B2!112&parid=8FC13B21D305C1B2!107&authkey=!AMlLjsY6PHKn5AQ)

(that is a symbolic expression I'd wish to manipulate) taken as a single element of a list  by  a:=ImportVector("dinner.txt", datatype = anything);

kernel says it cannot interpret file.

Is there a limit in the input file dimension ?
 It's...

Dear All,

I would like to know the easiest way to write data, that are stored in a matrix after a computation, to a file with a specific format. To be more precise, I wish to have the possibility to change the format for a given column.

Here is a trial (output is wrote to the terminal for simplification) based on some examples I found, but without success.

WritedataMatrix.mw

> seconddegree:= proc(a,b,c) 

 if a=0 then if b=0 and c=0 then print ('infinite solutions')  

elif b=0 and c<>0 then print ('impossible')  

elif b<>0 and c<>0 then print (' one solution',x=-(c)/(b))fi;   

delta:=b^(2)-4 *a*c;    

elif if delta=0 then print('double solution',x=-b/(2 a))  

elif delta >0 then print ('exist two  solutions',x1=((-b+sqrt(delta...

Hi everyone,

I have this differential equations:

gamma1:=1;gamma2:=1;

l:=t->sqrt((x1(t)-x2(t))**2+(y1(t)-y2(t))**2);
2 2
l := t -> sqrt((x1(t) - x2(t)) + (y1(t) - y2(t)) )

DE:=[diff(x1(t),t)=(-1/(2*Pi))*gamma2*(y1(t)-y2(t))/l(t),diff(y1(t),t)=(-1/(2*Pi))*gamma1*(x1(t)-x2(t))/l(t),diff(x2(t),t)=(-1/(2*Pi))*gamma2*(y2(t)-y1(t))/l(t),diff(y2(t),t)=(-1/(2*Pi))*gamma1*(x2(t)-x1(t))/l(t)]:

I want to draw the phase portraits (x1(t...

Hello, I'm just starting to work with maple I'm working on Enzyme kinetics project and I have no idea how to solve ODE system using GEAR'S or A-stability methods. I'm looking for help.

What is wrong?

> restart;
> Digits := 10;
> dsys := {diff(E(t), t) = -kf*E(t)*S(t)+kr*ES(t)+kcat*ES(t),

Hi there,

I have created an animated plot of a modelled beam under sinusoidal forcing. It shows the beam bending along the x-axis. I was wondering how to plot the animated function with the beam lying along the y-axis instead of the x-axis as happens when i use the following command:

animate(w,x=0..1,t=0..0.1,frames=150,numpoints=100,color=red,thickness=3);

Any idea's?

Dear friends

I want to plot a function with these coordinates in x and y directions where:

x=(0,0.0150754,0.0376884,0.0829146,0.0527638,0.120603,0.173367,0.203518,0.241206,0.286432,

0.316583,0.354271,0.39196,0.437186,0.474874,0.550251,0.58794,0.625628,0.678392,0.746231,

0.708543,0.81407,0.949749,1.1005,1.17588,1.33417,1.59045,1.91457,2.25377)

and

y=(1, 1.20603, 1.53769, 1.6, 1.77889, 2.74372, 3.49749, 3.9196, 4.43216,...

Dear All,

I am trying to find (complex) eigenvalues and eigenvectors of a matrix as a function of a variable. Using the following commands lead to the respective errors:

- LinearAlgebra[Eigenvalues](A): Error, (in content/polynom) general case of floats not handled

- LinearAlgebra[Eigenvectors](A): Error, (in LA_Main:-Eigenvectors) cannot determine if this expression is true or false: 0.2480392156e-4*abs...

I've created a matrix in which each row has two values. I'm using Add(i,i=[matrixName][row element number])/2 to find the mean of each row, which I'd like to transfer to a corresponding element number in an array or a vector, but so far I can only get it to work on single rows or (if I use only Add(i,i=[matrixName]/2), understandably, the mean of the whole matrix. Is there a way to do it wholesale?

I've the equation

(-x^2+eta^2+2*x*xi+2*x*eta-xi^2-2*xi*eta-2*x*y-2*y*eta+2*xi*y+y^2)*(-x^2-2*x*eta+eta^2+2*x*xi+2*xi*eta-xi^2+2*x*y-2*xi*y-2*y*eta+y^2)-(x-xi)^4+6*((x-xi)^2)(-y+eta)^2-(-y+eta)^4

The answer is 0

But I can't get the answer by simplify and expand

Then which .Thanks

Hello,

I'm trying to fit a double-diode equation using Maple.  I can get an analytic form of the fitting function in my two variables V and J of the form V(J), but I want J(V), so I'm using fsolve to extract this.  I'm then trying to fit the resulting function to a set of experimental data, but I'm getting an error about writing to an rtable.  I've tested the function, and it gives me a numeric value if I give it numeric inputs.  Is there a way I can fit it?  Code is below: