# [R] How to calculate a double integral ...?

Gabor Grothendieck ggrothendieck at myway.com
Thu Oct 21 08:11:18 CEST 2004

cjlu <cjlu <at> mail.ncku.edu.tw> writes:

:
: Dear R-Friends,
:
: How can I calculate a double integral like
:
:   \int_a^b \int_c^y g(x, y) dx dy
:
: where a, b, c are constants, g(x, y), e.g.,
: g(x, y) = tan(x + y).
:
: I tried to nested integrate() and adapt(),
: but none of them working, seemingly due to the
: limits can not be specified constants.
:

Integrate

g2 <- function(x, y) g(x, y) * (x > y)

over (a,b) x (a,c).