MATLAB: Help with coding (integral)

integralintegrationmatlab function

How can i solve this integral ((1/5*x)+1)*sqrt(1+exp(-2x)) by using Simpsons method? The upper limit is 1 and the lower limit is 0. I know how to solve it, but i keep getting these errors. It says "Invalid expression. Check for missin multiplication operator…".

Best Answer

Typo in line 18 - use sum_f instead of sum_ f
a = 0; 
b = 1; 
n = 20; 
m = n/2; 
dx = (b-a)/n; 
x = a; 
sum_f = ((1/5*a)+1).*sqrt(1+exp(-2*a));
eqn = @(x) ((1/5*x)+1).*sqrt(1+exp(-2*x));
for i = 1:m-1
    x = x + dx; 
    sum_f = sum_f + 4*((1/5*x)+1).*sqrt(1+exp(-2*x));
    x = x + dx;
    sum_f = sum_f + 2*((1/5*x)+1).*sqrt(1+exp(-2*x));
    end
x = x + dx; 
sum_f = sum_f + 4*((1/5*x)+1).*sqrt(1+exp(-2*x));
sum_f = sum_f + b/((1/5*b)+1).*sqrt(1+exp(-2*b));
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