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How do i convert this for loop into a while loop?

Asked by Ilker Enes Çirkin on 28 May 2019
Latest activity Commented on by Ilker Enes Çirkin on 28 May 2019
I just couldn't figure out how to convert it into a while loop. here is the code:
clc;
clear;
clear all;
n=input('Enter the number of elements in your array:'); % number of array elements
for i=1:n
values(i)=input('Enter the values:')
if values(i)<0
values(i)=values(i)*(-1)
end
end
for k=1:(n-1)
d=k+1
Xaverage(k)=(values(d)+values(k))/2
end
y=1:1:n;
plot(values,y)
hold on
z=1:1:(n-1);
plot(Xaverage,z)

  1 Comment

this is what i have tried so far:
clc;
clear;
clear all;
n=input('Enter the number of elements in your array:'); % number of array elements
i=1;
while i<n
values(i)=input('Enter the values:');
if values(i)<0
values(i)=values(i)*(-1)
end
end
k=1;
while k<(n-1)
d=k+1
Xaverage(k)=(values(d)+values(k))/2
end
y=1:1:n;
plot(values,y)
hold on
z=1:1:(n-1);
plot(Xaverage,z)

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2 Answers

Answer by James Tursa
on 28 May 2019
 Accepted Answer

This for loop:
for i=1:n
% stuff
end
is equivalent to this while loop:
i = 1;
while i <= n
% stuff
i = i + 1;
end
Your biggest problem is you never increment i or k in your while loops.

  2 Comments

yes ı noticed that after i shared this but after changing it i get the error saying Index exceeds the number of array elements (2).
Please post your current code.

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Answer by Ilker Enes Çirkin on 28 May 2019

This is my current code:
n=input('Enter the number of elements in your array:'); % number of array elements
i=1;
while i<=n
i=i+1;
values(i)=input('Enter the values:')
if values(i)<0
values(i)=values(i)*(-1)
end
end
k=1;
while k<=(n-1)
k=k+1;
d=k+1
Xaverage(k)=(values(d)+values(k))/2
end
y=1:1:n;
plot(values,y)
hold on
z=1:1:(n-1);
plot(Xaverage,z)

  2 Comments

You did not copy the form of the while loop correctly. Incrementing the index variable is the LAST thing you do in the loop as I have written it. So your i=i+1 and k=k+1 lines need to be the LAST things you do in the loop, not the first.
oh thank you so much it works now :)

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