Use Matlab to show that the sum below converges to 3, i.e. lim_k rightarrow infi

Question

Use Matlab to show that the sum below converges to 3, i.e. lim_k rightarrow infinity = 3: sigma^infinity_k = 0 (2/3)^k = (2/3)^0 + (2/3)^1 + (2/3)^2 + ... Show this by computing the values of the partial sums S_n = sigma^infinity_n = 0 (2/3)^k, where n = 10, 20, 30. You may choose one of two different ways to calculate the partial sums: Vectorizer. Define a vector with first element 0 that increments by 1 up to 10 (and 20 and 30) and use element-by-element calculations to determine the sum. You may want to consider the built-in function cumdump. Loop. Obtain the partial sums using a for loop. Note that the infinite sum begins at n = 0 but for loops cannot begin incrementing with 0, therefore you would need to initialize the loop with the value (2/3)degree.

Explanation / Answer

% MATLAB script starts here

n_1 = 10;

sum_1 = 0;

for ii = 1:n_1+1
   
    sum_1 = sum_1+(2/3)^(ii-1);
   
end


n_2 = 20;

sum_2 = 0;

for ii = 1:n_2+1
   
    sum_2 = sum_2 + (2/3)^(ii-1);
   
end


n_3 = 20;

sum_3 = 0;

for ii = 1:n_3+1
   
    sum_3 = sum_3 + (2/3)^(ii-1);
   
end


sprintf('For n = %d sum is %f', n_1,sum_1)

sprintf('For n = %d sum is %f', n_2,sum_2)

sprintf('For n = %d sum is %f', n_3,sum_3)



% MATLAB script ends here

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