How to store all the A matrix that I have got from every iteration

for a = linspace(15,75,5)
    theta0 = a
    y = ((tan(theta0)*x)) - (g*((x.^2))./(2*((v0*cos(theta0)).^2))) + y0
    A = [theta0 y]
    
end

Answer 1

[Walter Roberson]

a_vals = linspace(15,75,5)
num_a = length(a_vals);
A = zeros(num_a, 2);
for a_idx = 1 : num_a
    a = a_vals(a_idx);
    theta0 = a;
    y = ((tan(theta0)*x)) - (g*((x.^2))./(2*((v0*cos(theta0)).^2))) + y0
    A(a_idx, :) = [theta0 y];
end

Answer 2

[Jonas]

is y a single value? then A would be a row vector. you can initialize your A before the loop as A=nan(numel(linspace(15,75,5)),2) and change the A line to A(a/15,:)= [theta0 y]