MATLAB . .
. . MATLAB :
- cumtrapz()
- cumtrapz(x,y)
- trapz(y)
- trapz(x,y)
. () . , . () , .
.
() = *x + ln(x) + 1
1 10 0.5.
:
x=1:0.5:10;
y=x.*exp(x)+log(x)+1;
trapz(x,y)
:
ans =
2.032841320958599e+005
. . MATLAB . :
quad('fun', a, b)
quad('fun', a, b, tol)
:
- 'fun' , ;
- , b ;
- tol , ; tol=10-3.
. x+ex [1, 2] 10-5.
quad('x+exp(x)', 1, 2, 1e-5)
:
ans = 6.170774280645000e+000
R , . .
- I ,
- I(n) n h = (b-a)/n,
- I(2n) 2*n , h = (b-a)/2n.
, I(2n), ..
[a, b]. . . I(2n) :
m = 3 , m = 15 .
. , , .