How to save variables and put them in a vector

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Feliciano Döring
Feliciano Döring 2018-8-29
评论： Walter Roberson 2018-8-29
I have this code in which i input a value, let's call it x. The code runs, and afterwards it stores a value called y. For each different x there's another y. What i want to do is each time i input an x it stores its value on a vector and the value from y on another vector so i can later plot them together.

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Walter Roberson
Walter Roberson 2018-8-29
Example:
num_runs = 10;
all_x = zeros(num_runs, 1);
all_y = zeros(num_runs, 1);
for K = 1 : num_runs
x = randi([-K K], 1, 1);
y = x.^2;
all_x(K) = x;
all_y(K) = y;
end
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Feliciano Döring
Feliciano Döring 2018-8-29
In this case all_y and all_x are storing the variables somewhere or do i need to put my variables as cell arrays o i can store them properly?
Walter Roberson
Walter Roberson 2018-8-29
Script version:
global all_x all_y
x = input('Enter an x value ');
r = rand() * sqrt(x);
y = atan2(r, x);
all_x(end+1) = x;
all_y(end+1) = y;
Or better for the script case:
if ~exist('all_x', 'var'); all_x = []; all_y = []; end
x = input('Enter an x value ');
r = rand() * sqrt(x);
y = atan2(r, x);
all_x(end+1) = x;
all_y(end+1) = y;
all_x and all_y are storing all runs of the values. You would only need cell arrays if your values are not scalar numeric values.

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