Hello All,

This is my first post, and I want to thank you for helping guys like me.

I am working on a project, but I've gotten to a point, where I need help :(

Actually, it is 2 points...

• I am using Maple 12 (document mode), and I'm trying to get the following graph drawn:

mm:=(101/100)*ln(10)-ln(S(t))+10-S(t) = 5*t

plot2:=implicitplot(mm, t = 0 .. 10, S = 0 .. 10)

display(plot2)

How do I define a Function of functions with maple?

For example:

F(y(x),y´(x))=y(x)*y´(x).

or

F(u(x),v(x))=sin(u(x)v(x)).

 

Thanks,

Sebastián Varas K.

 

 

I have a curve which has two peaks and I need to find the width of each peak at half the height of peak's value.

What do I need to do to find the widths?

I checked the forums and only this suggestion didn't give an error message, but the results is not helping me out much.

max(flatten(Img_pigeon_HWT));

 

results in

flatten(Vector(4, {(1) = ` 1..512 x 1..768 `*Array, (2) = `Data Type: `*float[8], (3) = `Storage: `*rectangular, (4) = `Order: `*C_order}))

 

The purpose of all this is to do some edge detection upon an image.

 

I'm trying to solve a diffusion PDE with initial conditions, but can't seem to get the syntax right? Here's what I have: pde:= diff(C(r, t), t) = Di*(diff(r^2*(diff(C(r, t), r)), r))/r^2-lambda*C(r, t)+Beta Initial conditions (which I'm not sure how to define) C(r,0)=0 C(0,t)=finite C(a,t)=0 r=0 to a t>0 I can use pdsolve(pde,build) to get a reasonable solution, but when I try: pdsolve(eq, C(a, t) = 0, build) I get: Error, (in pdsolve/info) wrong extra arguments: {C(a, t) = 0}

By Maple

convert(LegendreQ(1,x),hypergeom)

hypergeom([1, 3/2], [5/2], 1/x^2)/(3*x^2)

LegendreQ(1,0.)

-1.000000000-3.141592654*10^(-15)*I

The 2F1 form suggests for me that in x=0 LegendreQ is infinite or at least undetermined. So what is the truth?

I work with LegendreQ(1,x) where x is real.

Thanks,

                      Sandor

 

Hi all,

I am doing some research where I solve three differential equations simultaneously.. The results are three optimal time paths, W(t), R(t), and H(t). I want to plug these three into an integral, and solve (to get the net present value of my initial problem). I have no problem solving the diff. equations and getting values, given initial conditions. I am getting an error in the integration. I know I am missing something in the way I set it up. Anyways, I am putting my steps here below. Thanks for taking a look!

Boy, this program sure makes me feel like an idiot.  (I am a full professor at a top university, but maple has turned me into an idiot.)

so, here's my stupid question now:

(for those of you who do statistics, this is the principal stratification problem in causal inference.  Eventually, I'll replace equations 9-11 with other conditions.

I hope to show my class this.)

Hello, I want to evaluate a double integral with fsolve as a limit. A simplified version of the problem is:

f:=(r,z)->r+z;

evalf(Int(Int(1,rbar=0..fsolve(f(r,z)=1,r)),z=0..1);

I've tried several variations of unapply and '...' but get the error:

Error, (in fsolve) z is in the equation, and is not solved for

 

I'd appreciate your advice!

 

Although I am relatively new to Maple, Maple TA and postgreSQL, I am technically literate, but cannot find the answer to this question.  What I would like to do is pull off a SQL query that shows the answers given by all the students to one particular question, say worksheet 7 question 5.

However, a particular question seems to be held in the database as, say, answersheetitem.question=3 and answersheetitem.questiongroup=4, as in my current query, shown here:

****begin sql

I need to create an iterative code to find the minimum of the function

f(x)=1/2*Transpose(x)*A*x-Transpose(x)*b

where x and b are vectors in R^2 and A is a 2X2 symmetric positive definite matrix. The implications of this is that the gradient of the function is

gradf=A*x-b

and that we are indeed searching for a minimum.

This is the code I have so far, using the while command to create a loop.

(a)Assuming the probability of obtaining heads in a coin toss is 0.5, compare the probability of obtaining heads in 5 out of 10 tosses with the probability of obtaining heads in 50 out of 100 tosses.

(b) For a set of 10 tosses and for a set of 100 tosses, calculate the probaility that the fraction of heads will be between 0.445 and 0.555.

Hi,

I want to compute a define integral as follows:

Hi,

I'm working on a computational physics project and prefer to use Fortran codes (compiled by MVS-9) with Maple power together.

In recent days I've changed some compiler options in MVS and unfortunatly (I don't remember the options) nothing works well as before.

For example, as I try to use a simple code like this:

Dear Mathlovers, The probleme is that i have created an animation for the mandelbrot set. The only probleme is that the axes dont rescale. Can anyone solve this. The animation is a zoom in on a point with 5 frames. Code is bottem of the post Grtz Pieter Excuse me for my bad english Code : ------ mandelbrot:=proc(x,y) local c,z,m; c:=evalf(x+y*I); z:=c; for m from 1 to 75 while abs(z)