plot3 is showing axes but not vectors

I'm trying to make a script to rotate a vector around another vector and the vectors I'm trying to plot aren't showing up...

% Script to rotate a vector

close all;
clear;

vector_a = [input("Enter an x value for the vector a"), input("Enter a y value for the vector a"), input("Enter a z value for the vector a")];
theta = input("Enter a value for the rotation angle");
vector_e = [input("Enter an x value that makes vector e orthogonal to a, for the vector e"), input("Enter a y value that makes vector e orthogonal to a, for the vector e"), input("Enter a z value that makes vector e orthogonal to a, for the vector e")];

magnitude_e = sqrt(((vector_e[1]).^2)+((vector_e[2]).^2)+((vector_e[3]).^2))

norm_vec_e = [(vector_e[1])/magnitude_e, (vector_e[2])/magnitude_e, (vector_e[3])/magnitude_e]

if dot(norm_vec_e, vector_a) ~= 0
    disp("There was an error as the input vectors a and e are not orthogonal");
    quit;
else
    vector_a_prime = vector_a*cos(theta) + cross(norm_vec_e, vector_a)*sin(theta)
end

matrix_of_vectors = [vector_a, norm_vec_e, vector_a_prime];

plotv(matrix_of_vectors, "-"); legend("Vector A", "Unit Vector E", "Vector A Prime"); grid on;

Answer 1

[darova]

First of all use these parenthesis to access an element:

vector_e(1)

MATLAB is MATrix LABoratory. Take an advantage of it

% norm_vec_e = [(vector_e[1])/magnitude_e, (vector_e[2])/magnitude_e, (vector_e[3])/magnitude_e]
norm_vec_e = vector_e/magnitude;

You can enter all elements of an array at once:

a = input('Enter vector e: ');
%%
Enter vector e: [1 2 0.2]
a =
    1.0000    2.0000    0.2000
    

To plot all vector:

matrix_of_vectors = [vector_a; norm_vec_e; vector_a_prime];        % concantenate vertically
v0 = zeros(3,1);
% plot3(x,y,z)
plot3([v0 matrix_of_vectors(:,1)]',[v0 matrix_of_vectors(:,2)]',[v0 matrix_of_vectors(:,3)]','.-r')
% or quiver3
% hold on
% quiver(0,0,0,matrix_of_vector(:,1),matrix_of_vector(:,2),matrix_of_vector(:,3))
% hold off