how do I do Integration

when f(x)=2,x1=0.1 and x2=0.5. How do i do integration of f(x) from x1 to x2

Answer 1

[DGM]

For a constant function like that, you could just do it geometrically:

f = 2;
xrange = [0.1 0.5];
s = f*abs(diff(xrange))

s = 0.8000

For a general symbolic approach, start with something like this instead

syms x
f = 2 + 0*x; % this just forces f to be a symbolic expression
s = int(f,[0.1 0.5])

s = 

s = double(s) % maybe you want a numeric representation instead

s = 0.8000

Try another

f = 2*sin(x) + 5*x + 3*x^2; % a bit more complicated
s = int(f,[0.1 0.5])

s = 

[Ls]

When i run it it shows an error stating syms requires symbolic math toolbox. How so i solve this problem

[DGM]

Oh. I assumed you had that. You can always do it numerically instead:

f = @(x) 2 + 0*x; % define f as an anonymous function
s = integral(f,0.1,0.5)

s = 0.8000

f = @(x) 2*sin(x) + 5*x + 3*x.^2;
s = integral(f,0.1,0.5)

s = 0.9588