Dear expeRts,
I somehow don't see why the following does not work:
integrand <- function(x, vec, mat, val) 1 # dummy return value
A <- matrix(runif(16), ncol = 4)
u <- c(0.4, 0.1, 0.2, 0.3)
integrand(0.3, u, A, 4)
integrate(integrand, lower = 0, upper = 1, vec = u, mat = A, val = 4)
I would like to integrate a function ("integrand") which gets an "x" value (the
running variable), a vector ("vec"), a matrix ("mat"), and a value ("val").
This function returns a number (set to 1 here). Of course, pointwise evaluation
works without flaws. But why does integration not work? I obtain:
Error in integrate(integrand, lower = 0, upper = 1, vec = u, mat = A, :
evaluation of function gave a result of wrong length
Cheers,
Marius
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