For loop to add elements in a vector

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Huereka Aragon
Huereka Aragon 2021-2-28
回答： KALYAN ACHARJYA 2021-3-1
Hello,
I wanted to come up with a for loop statement where all of my elements add up together given a formula to get each element, x(1) and length of the x vector
x=zeros(15,1);
x(1)=50;
x(2)=x(1)+(x(1)*0.005)+200;
x(3)=x(2)+(x(2)*0.005)+200;
x(4)=x(3)+(x(3)*0.005)+200;
and etc
formula used to get each element is x(n)=(x(n)-1)+((x(n)-1)*0.005)+200 and
I mean i can do what i did up until 15 but is i know for loop is more convenient.
i tried
x=zeros(15,1);
x(1)=50;
for iv=2:length(x)
x(iv)= (x(iv-1))+((x(iv-1))*0.005)+200;
end
summ=sum(x);
disp(summ);
but doesnt seem to work

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回答（1 个）

KALYAN ACHARJYA
KALYAN ACHARJYA 2021-3-1
% Set the format as per how numbers should appear in Command Window output
format shortG
Next:
x=zeros(15,1);
x(1)=50;
for i=2:length(x)
x(i)=x(i-1)+x(i-1)*0.005+200;
end
x
x =
50
250.25
451.5
653.76
857.03
1061.3
1266.6
1473
1680.3
1888.7
2098.2
2308.7
2520.2
2732.8
2946.5
Sum of the array x
summ=sum(x);
disp(summ);
22239

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