MATLAB: Trapz between 2 points

Question

Hello,

I want to calculate the integral under a curve between 2 specific points on the x-axis.

How can I do this?

Thanks.

Answer 1

Example:

>> x=1:10
x =
     1     2     3     4     5     6     7     8     9    10
>> y=rand(1,10)
y =
  Columns 1 through 7
    0.8147    0.9058    0.1270    0.9134    0.6324    0.0975    0.2785
  Columns 8 through 10
    0.5469    0.9575    0.9649
>> trapz(x(4:6),y(4:6))
ans =
    1.1378
>>