how to use "while" in writing function?

A geometric series can be approximated using the following identity SUM ar^k = a / (1-r)

Provided that r < 1. Write a script that approximates the geometric series for r = 0.5 using several iterations to get within .001% of the actual value. You may use either a while or for loop.

[Jan]

This is not a question, but a command. As for all homework questions, it is recommended to post, what you have done so far and ask a specific question.

Answer 1

[Youssef Khmou]

hi Duong,

while loop must be used because after each iteration you have to check a if certain condition is met or not :

After iteration n you have : Un and Un-1, so as long as Un-Un-1>1e-5 do the same instructions

 tolerance=;% You complete it 
 U2=0; %Init
 U1=0;% Init
 A=;% You complete it
 Diff=10; % INITIA
while diff>tolerance

   U2=U2+............
   U1=U2........

   Diff=U2-U1;
   ....

[Jan]

"diff" is a built-in Matlab command. Using this symbol as a variable may cause unexpected behavior.

[Youssef Khmou]

alright Jan, i changed it, thnks