Borrar filtros
Borrar filtros

Please help me convert equation to matlab code.

5 visualizaciones (últimos 30 días)
adi putra
adi putra el 1 de Abr. de 2018
Comentada: Walter Roberson el 18 de Ag. de 2022
2 contribuyentes han marcado con alerta este/a pregunta
Deal all.
I need you help to convert this equation to matlab code
I spend a lot of time to write it but it doesn't work. Thank you.
  1 comentario
Walter Roberson
Walter Roberson el 1 de Abr. de 2018
Are you permitted to use the symbolic toolbox?
Is the question about providing some kind of symbolic proof, or is it about calculation of the formula using finite precision and a particular numeric input?

Iniciar sesión para comentar.

Respuestas (8)

Birdman
Birdman el 1 de Abr. de 2018
Editada: Birdman el 1 de Abr. de 2018
Basically, Symbolic Toolbox will help you:
syms y(x) n
f(x)=symsum((-1).^n*(x.^(2*n+1))/factorial(2*n+1),n,0,Inf)
  4 comentarios
Roger Stafford
Roger Stafford el 1 de Abr. de 2018
@Birdman: I think you meant f(pi/2)
Birdman
Birdman el 1 de Abr. de 2018
Yes, I just now edited it Roger.

Iniciar sesión para comentar.


Roger Stafford
Roger Stafford el 1 de Abr. de 2018
N = 100; % <-- Choose some large number
s = x;
for n = 2*N-1:-2:1
s = x - s*x^2/((n+2)*(n+1));
end
(I think you meant to take the limit as N approaches infinity, not x.)

kalai selvi
kalai selvi el 15 de Sept. de 2020
pls answer this question ...how to write the equation into code
  2 comentarios
John D'Errico
John D'Errico el 15 de Sept. de 2020
Please don't post a completely distinct question as an answer.
Walter Roberson
Walter Roberson el 15 de Sept. de 2020
π is written as pi in MATLAB.
exp of an expression is written as exp(expression) in MATLAB.
is written as sqrt(expression) in MATLAB.

Iniciar sesión para comentar.


kalai selvi
kalai selvi el 16 de Sept. de 2020
How to write a code on IOTA filter in fbmc system
  2 comentarios
Walter Roberson
Walter Roberson el 16 de Sept. de 2020
Editada: Walter Roberson el 17 de Sept. de 2020
Warning: pudn has questionable security. Take precautions when you access it.
kalai selvi
kalai selvi el 23 de Sept. de 2020
thank you

Iniciar sesión para comentar.


Kunwar Pal Singh
Kunwar Pal Singh el 26 de Abr. de 2021
please answer this....how to write this equation into MATLAB CODE
  1 comentario
Walter Roberson
Walter Roberson el 26 de Abr. de 2021
%these variables must be defined in a way appropriate for your situation
S_N = rand() * 10
theta = randn() * 2 * pi
l = randi([2 10])
b_1 = rand()
c_11 = rand()
t_year = randi([1950 2049])
d_11 = rand()
t_1 = rand()
t_x = t_1 + rand()
lambda_a = randi([500 579])
LOTF_a = rand()
P = rand()
K_l = rand()
k_0 = rand()
t_tau = randi(10)
overhaulcost_a = 1000 + rand()*100
%the work
syms t
part1 = int(S_N .* cos(theta) .* l .* b_1 .* t_year .* d_11, t, t_1, t_x);
part2 = int(lambda_a .* LOTF_a, t, t_1, t_x);
part3 = int(P*K_l .* t_year + P .* k_0 .* l .* l .* t_tau, t, t_1, t_x);
part4 = overhaulcost_a ;
result = part1 - part2 - part3 - part4;

Iniciar sesión para comentar.


Jakub Laznovsky
Jakub Laznovsky el 19 de Mayo de 2021
Hi guys, can you please help me with conversion this piece of code to the mathematical equation?
It i a simple 3D mask proceeding the image, and searching for adjoining number one and number two. Thank you in advance.
Code:
m1=[0 0 0; 0 1 0; 0 0 0];
m2=[0 1 0; 1 1 1; 0 1 0];
mask=zeros(3,3,3);
mask(:,:,1)=m1;mask(:,:,2)=m2;mask(:,:,3)=m1;
for i=2:size(image,1)-1
for j=2:size(image,2)-1
for k=2:size(image,3)-1
help_var=image(i-1:i+1,j-1:j+1,k-1:k+1);
if sum(unique(help_var(mask==1)))==3
new_image(i,j,k)=3; %marks adjoining pixel with number 3
end
end
end
end
  4 comentarios
Jakub
Jakub el 22 de Mayo de 2021
Thanks a lot!

Iniciar sesión para comentar.


Adhin Abhi
Adhin Abhi el 4 de En. de 2022
(λlog vmax−log vmin) /(vmax−vmin )

Lukasz Sarnacki
Lukasz Sarnacki el 17 de Ag. de 2022
Please help
  5 comentarios
Lukasz Sarnacki
Lukasz Sarnacki el 17 de Ag. de 2022
Thay all are arrays
A(x; y) is the average intensity of the fringe image
B(x; y) is the so-called intensity modulation.
ϕ is the corresponding wrapped phase
Walter Roberson
Walter Roberson el 18 de Ag. de 2022
syms n N integer
syms A(x,y) B(x,y) phi(x,y)
Pi = sym(pi)
Pi = 
π
I(n,x,y) = A(x, y) + B(x,y) * cos(phi(x,y) - 2*Pi*n/N)
I(n, x, y) = 
numerator = simplify(symsum(I(n, x, y) .* sin(2*Pi*n/N), n, 0, N-1))
numerator = 
denominator = simplify(symsum(I(n, x, y) .* cos(2*Pi*n/N), n, 0, N-1))
denominator = 
eqn = phi(x,y) == atan(numerator ./ denominator)
eqn = 
simplify(eqn)
ans = 

Iniciar sesión para comentar.

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by