We have a list of cartesian coordinates [[x1,y1], [x2,y2],..., [xn,yn]], which describes some curve (say the way of a walking dog). We don't know any analytic expression for that curve. How to estimate the radius of curvature of the curve from below and above with Maple?

Hi,

I would like to define the following exceptions:

0/0 should be equal with 0, but any other x/0 should be infinity, if x>0 or -infinity, if x<0.

In the following example, I show what I achieved, however, I also would like to have equation (8) to be infinity.

BR,

Zoltan Faigl

Hi, I would like to numerically work out the profile of one expression (integral and BesselK function involved). But the computer was just jammed and came out nothing after long time waiting. I attach the worksheet below and maybe you could have a look at it or directly run it in your machine to check what is wrong, either my computer or the code itself. Thank you very much.

> restart;
> with(PDEtools); with(Units[Standard]); with(ScientificConstants);

bir değişkene textfield değeini nasıl atayabirim

I am trying to plot a vector field with fieldplot, but the vector field components contain a numerical integration (i.e. evalf(Int(...,...)). However, maple refuses to plot it, and gives me this error mesasge

"Error, (in plots/fieldplot) no non-zero vectors found"

maple has no problem evaluation the vector field at any value of x, and y, and takes only a fraction of a second for each point. However, if i change the integral inside the vector field components to int(...

The following example tries to do the same thing two different ways.

Calling a procedure "M1" directly by name works fine.

Calling the same procedure by substitution fails to substitute, and when the substrituion is forced using "apply" I get an error message.

Why does the substitution not work, and where is the error?

Because of the complexity of my problem, I need to use substitute (or anything else equivalent) instead of directly calling the procedure by name.

I am new to maple, and looking for som tourturial to get me started. My school dont offer any education in the program.

Can maple do the same things as matlab? i have a little program i wrote i matlab. Is it possible for me to write that i maple?

% Afkøling af 1L mælk
% 08.02.2011/RBE

clc                   % sletter skærmen

thanks, this worked for me. As for the

eqn1 := u = V * cos(a) * cos(b);

eqn2 := v = V*sin(b);

eqn3 := w = V*sin(a)*cos(b);

res:=solve({eqn1, eqn2, eqn3}, {V,a,b});

map(sin, res[3]);

simplify(%);

gives sin(b) = v / ( RootOf( _Z^2 - v^2 - w^2 - u^2);

map(x->x^2, %);

simplify(%);

gives

sin(b)^2 = v^2 / (v^2 + w^2 + u^2), which has no _Z , but is not right. is there a better way to eliminate _Z ?

The equations are x+2y+3z=4, x +ky+4z=6, x+2y+ (k+2)z=6. I entered the eqautions and got up to this point. > eqlist := [eqn1, eqn2, eqn3]; and got the equations repeated back to be
> varlist := [x, y, z]; and got the 3 variables repeated back to me. When I tried to genrate the matrix, I put in. A := genmatrix(eqlist, varlist, flag), and got genmatrix([x+2*y+3*z = 4, x+ky+4*z = 6, x+2*y+z(k+2) = 6], [x, y, z], flag). What did I enter wrong? did I have to incorporate...

If I try like this

F := sin(x);

G := cos(x);

f := proc (x) options operator, arrow; F end proc;

g := proc (x) options operator, arrow; G end proc;

h := proc (x) options operator, arrow; f(g(x)) end proc;

h(x)

but it doesn't work.

PS: I want to make my own function Compostiton(F,G)

I need to define a tridiagonal matrix in maple in such a way that

[1 0 0 0 0. . . . . . . . . . . . . . . . 0]

[a(1) b(1) c(1) 0 0 . . . . . . . . . .0]

[0    a(2)  b(2)  c(2) 0 0 0 . . . . .0]

[0     0     a(3)  b(3) c(3) 0 0  . . 0]

[0 . . . . . . . . . . . . . . . . . . . . . . .]

[0.. . . . . . . . . . . . . . . . . . . . . . .]

Hello, MaplePrimes!

I want to create a custom component to solve a pulley dynamics problem using MapleSim. But I don’t know, how to do it, I’m a beginner in MapleSim.

So I decided to start my work with a simple model – I decided to create a custom component, which is equivalent with a standard component from MapleSim component library – Wheel Axle.

I’ve read a Help topic on Wheel Axle, from where I’ve found out differential...

I am trying to go from body-referenced aircraft velocities u, v, w, to angle of attack a, sideslip b, and total speed V. This is a standard problem for beginning aeronautics, I'm just wondering the best was to solve it with maple. Spefically, I would like to use the following relations to get short expressions for the derivatives of u, v, and w.

Given that

u = V * cos(a) * cos(b)

v = V*sin(b)

w = V*sin(a)*cos(b)

and all variables above...

Hi there,

I need to create permutations of this given set Z:=[2,5,7,8,10] with Maple and substitute these numbers in a given polynomial. 

To create the permutations i did this on maple:

> Z:=[2,5,7,8,10];

> C := combinat[permute](Z, 3):

how do I labelled the outcome of the permutations "C" as [a,b,c] so that I can then subtitute each permutation into the polynomial f:=4a+2b+c?

Thankyou for any help!

:)

Can anyone help me understand why the following happens?

N := GraphTheory[Digraph]({[1,3],[3,9],[9,27]});

GraphTheory[IsNetwork](N);

and

M := GraphTheory[Digraph]({[1,2],[2,4],[4,8]}); 

GraphTheory[IsNetwork](M);

both indicate that the graph is not a network.  On the other hand, for numbers n other than 2 and 3, Maple does recognize the graph {[1,n],[n,n^2],[n^2,n^3]} as a network.

This procedure that I wrote: