hi,

i ve to animate a function with maple. but my animation "vanishes" after some time so i wonder what i did wrong

my function f (x,y,t) = sin(sqrt(x^2+y^2-t))/sqrt(x^2+y^2-1)

this is how i tried it:

f := (x,y,t)->(sin(sqrt(x^2+y^2-t))/(sqrt(x^2+y^2+1)));
plots:-animate(plot3d, [f(x,y,t), x=-10..10,y=-10..10], t=-100..190);
 

if you let the animation run the animation starts to vanish, what am i doing wrong

hi,

i have to do a exercie to draw a sphere with maple. (radius = 5 )

first problem is to get the function for the sphere(implicit and explicit)

for the implicit one google helped me and gave me:
f(x, y, z)=x²+y²+z²-r²=0

i plotted it succesful with
plots:-implicitplot3d(f(x,y,z)=0, x=-5..5, y=-5..5, z=-5..5, scaling=constrained, axes=boxed);

for the explicit function i tried to solve the function for the x variable:

exp_x :=(y,z)->sqrt(r^2 - y^2 - z^2); 

hi,

i've a problem with a least square exercise.

3 measured values are given:

xi = 1, 4, 6

yi = 2,4,8

i've to find a optimized function of the type "y = f(x) = k * 2^(bx)"

till now i just worked with linear least square exercises like y = px + q. how do i get started with this one. what do i have to do?

thx for help in advance

hi,

tried to solve a least square problem with maple.

i've n=3 measured data

xi = 1, 4, 6

yi = 2, 4, 8

and have to create a optimised function of the type y=f(x) = px + q

i gave maple this input:

y := <2,4,8>;

x := <1,4,6>;

with(Student[LinearAlgebra]):

LeastSquares(x,y);

i have this function:

f :=x-> ln(x^2) + 3*(x-2)^2;

i derivated it four times and i suppose that maple does something wrong (or i do ^^) with the fourth derivation. i made the derivation on paper and my results fit until the last derivation.

f'(x) = (2/x) + 6(x-2)  ok

f''(x) = (-2/x^2) + 6   ok

f'''(x) = (4/x^3)  ok

f''''(x) = (-12/x^4)  not ok <-- this is the maple result

if i derivated the third derivation on paper:

u = 4      v' = 0