CODEWITHSUNDEEP
matlabnumerical-methods
Luke Pritchard
Luke Pritchard

Reputation: 11

Spacing for loop iterations in matlab

Essentially what I am trying to do is to get my for loop to run for iterations when n = 4,8,16,32,...,512. I tried earlier multiplying my the iteration variable within the for loop but MatLab wouldn't allow it. I tried searching for generating an exponentially spaced vector to use but there was no command. It seems like a pretty simple task, I could use a conditional statement before it but that seems like bad coding.

Is there a simple and elegant way to setup my loop conditons?

%% Analysis - Trapezoidal Rule


for n = 4:k:512
h = (b-a)/n;
changing_a = a+h;
for j = 1:n-1
    sum = function_q4_a(changing_a);
    changing_a = changing_a + h;
end

integral_value = ((b-a)/(2*n)) * (function_q4_a(a) + 2*sum + function_q4_a(changing_a));
disp('Current n = ');
disp(n);
disp('Integral value is: ');
disp(integral_value);

k = k*2;end

Upvotes: 1

Views: 73

Answers (1)

Shawn
Shawn

Reputation: 583

You can simply do something like

for n = 2.^(2:9)
   % Some code here
end

To be more precise,

2.^(2:9)

builds a vector [2^2, 2^3, 2^4, 2^5, 2^6, 2^7, 2^8, 2^9] - using the .^ element-wise operator - and then you just iterate over the values of this vector.

Upvotes: 4

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