Hey, I'm using NonlinearFit to find parameterranges in theoretical equations for physical data. however some of the parameter values are being returned as negative values and I need to specify parameterranges but am having trouble doing this. 

For example in the equation below I would like to specify that alpha and ro should take on positive values, as otherwise with the curret data set I am using ro is assigned a negative value.

g1 := NonlinearFit(E(F, alpha, ro, .31, 165, e), X, Y, F)

investigate the family of functions f(x,y) = e^(c+x^2 + y^2). how does the shape of the graph depend on c? using maple

graph the surface, tangent line and normal line for:

xy + yz + xz = 3 (1,1,1). choose the domain so that avoid the extraneous vertical planes.

the paraboloid  z = 6-x-x^2 -2y^2 intersects the plane x=1 in a parabola. graph the paraboloid, the parabola and the tangent line at point (1,2,-4). any help.

Hello,   I'm trying to find or simply define an associative and non-commutative product in Maple, with all the possibilities of the product *. The '.' product is only left assiciative, as '&*'.   How would it be possible ?   Thanks !

Hello together, I want to generate 1000 random numbers. I know the function for normally distributed numbers: X1 := random[normald[mu[1], sigma[1]]] The problem is: 1. I want only positive numbers (but exactly 1000)... 2. I want to set a lower(mu minus 3*sigma and upper limit (mu plus 3*sigma) Thanks for your help!

Hi, I possess values for X and Y in an intervall 1 .. 100 . For each combination (X,Y) you get a Z value of 1,2,3 or 4. Depending on the value Z each coordinate (X/Y) in the 2D CS should be displayed in form of a square (if Z=1 ->blue, Z=2->red,Z=3->yellow, Z=4->black). As a result I have to receive a kind of landscape with colored squares. Thanks a lot!

I am currently trying to plot some geodesics with maple, in order to do this I'm trying to get Maple to give me an expression for dr/dy (y here is actually a radial variable) from my equation system which is given by

sys := [diff(y(x), x) = sqrt((1-(diff(r(x), x))^2)/(r(x)^4+r(x)^2)), diff(r(x), x) = sqrt((2+1/r(x)^4-1/r(x)^2)/(1/r(x)^4-1)^2)]

Can anyone help me with this?

Hello everybody, I am using Nelder Mead for an optimization problem. The algorithmus I found in the Maple library is for minimization. Does anybody know how to change the algorithmus that I can also use it for a maximation problem? Thank a lot in advance!

Hi there,

I am got the two two ( identical ? ) summation .

f:=x->1;

b[n]:=2/Pi*int(f(x)*sin(n*x),x=0..Pi);

S:= N-> sum(b[n]*sin(n*x),n=1..N) ;

T:= N-> 4/Pi*sum(sin((2*n-1)*x)/(2*n-1),n=1..N);

I think S and T should be the same since it's just a substition of 2n-1 difference

however when I plot

 

i'm totally new with Maple so i really need help with this problem

graph the fucntion using various domains and viewpoints. plot some contour lines of the same function and compare with the graph.

f(x,y) = x*y^2 - x^3

thanks

Hi everybody, I datas for 2 variables X and Y. Each of them contains round about 1000 values. I want to sort the values of x and y and put them in a 3d histogram. Has anybody an idea how to do it?

  I been trying to run a maple loop recently where maple computes the values of r,theta,phi for spherical coordinates from some fsolve statements. However I have found this to take an extremely long time (days). What I want is for it to make rows of these and then output them to a file so that I have rows of r,theta and phi for several hundred thousand of them atleast. Currently I simply create a n by 3 array with however many entries my loop has and then fill each position in the array using for loops then I use writedata to write the entire array into a file.

Hi there,

 

I have computed the odd extension for f(x)=1 on 0 < x < Pi which is

> 4/Pi*Sum((sin(2*n-1)*x)/(2*n-1),n=1..infity);

 

how do I get a sketch of it?

 

Thanks

Dear Maple users,

How may I enter in MAPLE the function

f(x,y) = x*y /(x^2+y^2)  IF  (x,y) different from (0,0), and

f(x,y) = 0  IF  (x,y) =(0,0) ?

Thanks in advance for any help.

Jean-Jacques