Hi, I need help with graphing a certain logistics population model for an initial population size that is equal to 1.

dy/dt = k(1 - y/M)y  k=2 M(t)=10e^-t/5 +3(1-e^-t/5)

So far I've worked out the values to input, but I don't know how to write it in Maple.

I know all I have to replace is the M in the dy/dt equation with these 2 values.

M(0) = 10

M(t goes to infinity) = 3

Dear friends,

I have a basic question concerning Maple 15 (X86 64 LINUX). In fact it is so simple it is almost embarassing! Here it is.

When we do integration in a basic calculus class we learn that when integrating polynomials and series the constant that appears during the integration is usually taken to be zero, as polynomial and Laurent series terms will only produce powers and logs, but no constant. Of course the choice of constant does not influence definite integrals, as it cancels.

i want to solve this system of equation in analytic way in maple.

sys[Dx(t)+.01(.1x(t)+.1)^2*a+.01*.03*y(t)(1+x(t))*b+.02*.01*c*(z(t)+5)*(x(t)+1)=0,Dy(t)++.01*.03*y(t)(1+x(t))*a+.01*.09*y(t)^2+.01*.06*y(t)*(z(t)+5)c=0,Dz(t)+.02*.01*a*(z(t)+5)*(x(t)+1)++.01*.06*y(t)*(z(t)+5)*b+.01*.04*(z(t)+5)^2*c=0]

in this system a, b,c are costant

Hi there,

I am trying to graph some plots that show Gibb's Phenomenon. I assume that starting with a step function is a good idea.

I know how to plot a step function but I have no idea how to plot the curve that includes the overshoot?

Any help on how to add this to a step function plot would be appreciated greatly.

Thanks you

I consider a polynomial $P(x)$ such that their coefficients are in $\mathbb{Q}(u_1,\cdots,u_k)$ where $u_1,\cdots,u_k$ are complex parameters. I use in Maple the command $galois(p(x),x)$ and I obtain a fixed Galois group solution.  Fortunately, when I give explicit values (randomly chosen) to the $(u_i)_i$, I obtain always the previous group as Galois group. I think that Maple considers that the $(u_i)_i$ satisfy no algebraic equations, that is the $(u_i)_i$ are generic....

Dear all,

I am trying to plot two funtions on one graph, but the axis values differ.  I want to plot the function below with

y-axis starting from 0.284087

x-axis starting from 0

The function is

plot(evalf((A(theta)*B(theta)),theta=0..Pi),  eq A

what to be added in eq A in order the function know that the value of y (axis) should start from 0.284087, and not from zero

Thanks in advance

A.Q

> restart;
> F := Int(sqrt((2.138+0.3e-2*exp((4.2^2-z^2)/d^2))^2-2.141^2), z = 0 .. 4.2) = .5;

I have used the fsolve command, it seems like there is a problem.

thank you in advance.

Hello

i have an ode equation which has a variable coefficient n. i solve my ode and the code gave me  single plot for specific n.  i want to draw these plots in one plot the code wich draw plot is :

Hello all,

I have the following generalised algebraic Riccati Equations of type:

A^TY + Y^TA + C^TC - Y^TBB^TY = 0;

E^TY - Y^TE = 0;

where A is 12x12 matrix, C is a 16x12 matrix, B is a 12x2 matrix.

However, the "CARE" function solves the different Riccati equation (http://www.maplesoft.com/support/help/Maple/view.aspx?path=LinearAlgebra/CARE)

Would you please...

How do you define v=v(r) in maple? As to say 'v is a function of r'.

Thanks

Dear Maple users

This may be an easy task, but I cannot seem to find out how to do it: How do I get the solutions of an equation on a list form? Let's say the output of the solve command has the reference number (1), then I tried using the convert command and a label to refer to the Maple output, but it didn't work:

convert((1),list)

I hope someone can help me do it.

Regards,

Erik

I want to find the edges b and c of the triangle ABC knowing that the mesure of angles are 15 degrees, 30 degrees and 135 degrees and the length of one side is 3. I tried

restart:

a:=3:

eq1:=(a^2+b^2-c^2)/(2*a*b):

eq2:=(b^2+c^2-a^2)/(2*b*c):

eq3:=(c^2+a^2-b^2)/(2*a*c):

solve([eq1=cos(15*Pi/180),eq2=cos(30*Pi/180),eq3=cos(135*Pi/180)],[c,b]);

I'm using matrixplot to plot a matrix 10X10. 

But I want it to be shown only the interval between column 2..6 and row 1..10.

I tried to:

matrixplot(M, row = 1..10, column = 2..6, heights = histogram, axes = boxed) 

But gave error!

***I can not reset the Matrix for 10x5.

Tanks 

To plot the density function of the continuous uniform distribution on [-1,1], my initial attempt was: 

plot(Statistics:-PDF(Statistics:-RandomVariable(Uniform(-1,1)),x), x = -1.1 .. 1.1);

See plot below.


But I wanted something more like the wikipedia image (without the labels, naturally):

See plot below.

In words, I expected a horizontal line on the left of x=-1 and on the right of x=1 (at y=0), and I expected no vertical line at the x=-1 and x=1 points ...

I am generating a number of plots in Maple but would like to be able to collect the data points from the Maple plots and export them into an excel spreadsheet or similar spreadhseet program so that they can be loaded into other plotting software programs such as OriginLab.  

Is there a way to export the data points from plots produced in Maple into an .xls or .dat format?