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

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Anna
Anna 2013-8-4
评论： mustafa alnasser 2014-10-6
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!
  1 个评论
Jan
Jan 2013-8-4
编辑：Jan 2013-8-4
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.

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回答（2 个）

Azzi Abdelmalek
Azzi Abdelmalek 2013-8-4
编辑：Azzi Abdelmalek 2013-8-4
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);
  1 个评论
Jan
Jan 2013-8-4
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.

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Jan
Jan 2013-8-4
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.
  1 个评论
mustafa alnasser
mustafa alnasser 2014-10-6
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?

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