Borrar filtros
Borrar filtros

All my Values not getting stored. Only my Last Value is getting stored

2 visualizaciones (últimos 30 días)
Hi All,
Below attached is my code. In this code I am trying to produce various iterations of theta however only the last value of theta is getting stored in the loop. How can I fix this? Furthermore I am trying to save it into an excel spreadsheet however as it is only producing the last value, only one value is stored.
Thank You,

Respuestas (2)

Matt J
Matt J el 13 de Mzo. de 2023
Editada: Matt J el 13 de Mzo. de 2023
A loop will not accumulate a vector of results unless you tell it where in the vector the result is to be placed, e.g.,
for i=1:5
theta(i)=i^2;
end
theta
theta = 1×5
1 4 9 16 25
Compare this to,
for i=1:5
alpha=i^2;
end
alpha
alpha = 25
  2 comentarios
Tishan Anantharajah
Tishan Anantharajah el 13 de Mzo. de 2023
How would my code be changed accordingly to accumulate this?
Matt J
Matt J el 13 de Mzo. de 2023
Editada: Matt J el 13 de Mzo. de 2023
As in my example above. You currently have no indexing on the left hand side of your assignment statements that tell where your data is to be stored.

Iniciar sesión para comentar.


Cameron
Cameron el 13 de Mzo. de 2023
You need to save values of theta_average, so you can index it this way. You go through a while loop then save it when you need to by indexing.
k = 0 ;
theta_average = []; %preallocate this variable, then save it at the end
while true
hold on
va = 1;
mu = 0;
a = rand([3,1]);
b = rand([3,1]);
c = rand([3,1]);
d = rand([3,1]);
a_real = (1/sqrt(2*pi)*exp((-a.^2)/2));
b_real = (1/sqrt(2*pi)*exp((-b.^2)/2));
c_real = (1/sqrt(2*pi)*exp((-c.^2)/2));
d_real = (1/sqrt(2*pi)*exp((-d.^2)/2));
v1 = b_real-a_real;
v2 = c_real-a_real;
v3 = c_real-b_real;
v4 = d_real-c_real;
t = linspace(0,1);
v1x = v1(1)*t + a_real(1) ; v1y = v1(2)*t + a_real(2); v1z = v1(3)*t + a_real(3);
v2x = v2(1)*t + b_real(1) ; v2y = v2(2)*t + b_real(2); v2z = v2(3)*t + b_real(3);
v3x = v3(1)*t + c_real(1) ; v3y = v3(2)*t + c_real(2); v3z = v3(3)*t + c_real(3);
v4x = v4(1)*t + d_real(1) ; v4y = v4(2)*t + d_real(2); v4z = v4(3)*t + d_real(3);
grid on; rotate3d on
plot3(a_real(1),a_real(2),a_real(3),'or')
hold on
plot3(b_real(1),b_real(2),b_real(3),'or')
plot3(c_real(1),c_real(2),c_real(3),'or')
plot3(d_real(1),d_real(2),d_real(3),'or')
plot3(v1x,v1y,v1z,'b','linew',2)
plot3(v2x,v2y,v2z,'b','linew',2)
plot3(v3x,v3y,v3z,'b','linew',2)
plot3(v4x,v4y,v4z,'b','linew',2)
% Only 6 variations are possible for 4 points.
n_t = cross(v1,v2); n = n_t/norm(n_t);
% Did not cross v2 and v3 because they produce the same normal.
n2 = cross(v1,v3); n2 = n2/norm(n2);
% Why is n3 so large? How should I pick which normal to use out of a
% combination?
n3 = cross(v1,v4); n3 = n3/norm(n3);
n4 = cross(v2,v4); n4 = n4/norm(n4);
n5 = cross(v3,v4); n5 = n5/norm(n5);
n_average = (n3+n4+n5)./3;
nx = n(1)*t + a_real(1) ; ny = n(2)*t + a_real(2); nz = n(3)*t + a_real(3);
n3x = n3(1)*t + a_real(1) ; n3y = n3(2)*t + a_real(2); n3z = n3(3)*t + a_real(3);
n4x = n4(1)*t + a_real(1) ; n4y = n4(2)*t + a_real(2); n4z = n4(3)*t + a_real(3);
n5x = n5(1)*t + a_real(1) ; n5y = n5(2)*t + a_real(2); n5z = n5(3)*t + a_real(3);
n_averagex = n_average(1)*t + a_real(1) ; n_averagey = n_average(2)*t + a_real(2); n_averagez = n_average(3)*t + a_real(3);
plot3(nx,ny,nz,'r','LineWidth',2)
plot3(n3x,n3y,n3z,'r','LineWidth',2)
plot3(n4x,n4y,n4z,'r','LineWidth',2)
plot3(n5x,n5y,n5z,'r','LineWidth',2)
plot3(n_averagex,n_averagey,n_averagez,'r','LineWidth',2)
% Why is this not plotting?
[x,y] = meshgrid(1:100:8000);
% plane = n(1)(x-a(1)) + n(2)(y-a(2)) + n(3)(z-a(3)) = 0
z = ((n(1).*(x-a_real(1))) + (n(2).*(y-a_real(2))) - (n(3)*a_real(3)))./-(n(3));
z3 = ((n3(1).*(x-a_real(1))) + (n3(2).*(y-a_real(2))) - (n3(3)*a_real(3)))./-(n3(3));
z4 = ((n4(1).*(x-a_real(1))) + (n4(2).*(y-a_real(2))) - (n4(3)*a_real(3)))./-(n4(3));
z5 = ((n5(1).*(x-a_real(1))) + (n5(2).*(y-a_real(2))) - (n5(3)*a_real(3)))./-(n5(3));
z_average = ((n_average(1).*(x-a_real(1))) + (n_average(2).*(y-a_real(2))) - (n_average(3)*a_real(3)))./-(n_average(3));
hold on
grid on; rotate3d on
plot3(v3x,v3y,v3z,'b','linew',2)
surf(x,y,z)
surf(x,y,z3)
surf(x,y,z4)
surf(x,y,z5)
surf(x,y,z_average)
nv = n_t.*n_t;
dp = sum(nv);
mag = sqrt(dp);
n3v = n3.*n3;
dp3 = sum(n3v);
mag3 = sqrt(dp3);
n4v = n4.*n4;
dp4 = sum(n4v);
mag4 = sqrt(dp4);
n5v = n5.*n5;
dp5 = sum(n5v);
mag5 = sqrt(dp5);
n_averagev = n_average.*n_average;
dp_average = sum(n_averagev);
mag_average = sqrt(dp_average);
theta2 = acosd((dot(n_t,n3v))/(mag*mag3));
theta3 = acosd((dot(n_t,n4v))/(mag*mag4));
theta4 = acosd((dot(n_t,n5v))/(mag*mag5));
theta_average(end+1,1) = acosd((dot(n_t,n_averagev))/(mag*mag_average));
k = k + 1 ;
if k > randi(5,1)
break
end
disp(k)
disp(theta_average)
writematrix(theta_average,filename,'Sheet',1,'Range','B2:B10')
end

Categorías

Más información sobre Line Plots en Help Center y File Exchange.

Etiquetas

Productos


Versión

R2022b

Community Treasure Hunt

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

Start Hunting!

Translated by