Vectorized Two-dimensional Numerical Integration
int performs vectorized numerical integration of a given
two-dimensional function.
int2(f, a=c(-Inf,-Inf), b=c(Inf,Inf), eps=1.0e-6, max=16, d=5)
f |
The function (of two variables) to integrate, returning either a scalar or a vector. |
a |
A two-element vector or a two-column matrix giving the lower bounds. It cannot contain both -Inf and finite values. |
b |
A two-element vector or a two-column matrix giving the upper bounds. It cannot contain both Inf and finite values. |
eps |
Precision. |
max |
The maximum number of steps, by default set to 16. |
d |
The number of extrapolation points so that 2k is the order of integration, by default set to 5; d=2 is Simpson's rule. |
The vector of values of the integrals of the function supplied.
J.K. Lindsey
f <- function(x,y) sin(x)+cos(y)-x^2 int2(f, a=c(0,1), b=c(2,4)) # fn1 <- function(x, y) x^2+y^2 fn2 <- function(x, y) (1:4)*x^2+(2:5)*y^2 int2(fn1, c(1,2), c(2,4)) int2(fn2, c(1,2), c(2,4)) int2(fn1, matrix(c(1:4,1:4),ncol=2), matrix(c(2:5,2:5),ncol=2)) int2(fn2, matrix(c(1:4,1:4),ncol=2), matrix(c(2:5,2:5),ncol=2))
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