How to store results of for loop in 1D array.

So i want to to store 10,000 values resulting from a for loop in a 1D array. How do I do that?

My file reads:

goal = 1000000;
needMoreMoney = true;
age = 30;
savings = 10000;
inheritence = randi(10,1,1);
rateOfReturn = (-3 + (12 - -3)*rand);

while(savings<=goal);
    savings = savings + (savings * rateOfReturn) + 10000;
    age = age + 1;
end

if(inheritence==4);
    savings = savings + 10000;
end    

hist(retirement_age)

disp('Savings made in dollars: ');
disp(num2str(savings,'%.2f'));
disp('At age: ');
disp(age);

Where do I add the for loop and how do I store the values in an array? I am very new to this so i would appreciate you using my case above to give me the answer. Thanks!

[Jan]

Are you sure that the rateOfReturn should not change inside the loop?

It is not clear to me, where the FOR loop should be inserted.

Answer 1

[Azzi Abdelmalek]

goal = 1000000;
needMoreMoney = true;
age = 30;
savings = 10000;
inheritence = randi(10,1,1);
rateOfReturn = (-3 + (12 - -3)*rand);
while(savings(end)<=goal);
  savings(end+1) = savings(end) + (savings(end) * rateOfReturn) + 10000;
  age(end+1) = age(end) + 1;
end
if(inheritence==4);
  savings(end) = savings(end) + 10000;
end    
%hist(retirement_age)
disp('Savings made in dollars: ');
disp(num2str(savings,'%.2f'));
disp('At age: ');
disp(age);

[Jan]

Notice that this iterative growing of an array is considered as bad programming style, see http://en.wikipedia.org/wiki/Schlemiel_the_Painter%27s_algorithm . Therefore it is recommended to avoid this strictly and apply a proper pre-allocation.

Answer 2

[Jan]

The standard method for storing values in a vector is:

n = 10000;
data = zeros(1, n);  % Pre-allocation!!!
for k = 1:n
  data(k) = rand;    % Your calculations here
end

Or when the loop counter is not sufficient as index:

data  = zeros(1, n);  % Pre-allocation!!!
index = 0;
for k = 10:n+9
  index = index + 1;
  data(index) = rand;    % Your calculations here
end

And when the exact number of required elements is not known in advance, allocate the maximum number of elements.

[mustafa alnasser]

I have an array of two columns returned from function , i need to run this function inside loop and stores all arrays , how to do that?