Description Usage Arguments Value Examples
Computes the SDE model's drift function given data and parameter values.
1 | sde.drift(model, x, theta)
|
model |
An |
x |
A vector or matrix of data with |
theta |
A vector or matrix of parameters with |
A matrix with ndims
columns containing the drift function evaluated at x
and theta
. If either input contains invalid SDE data or parameters an error is thrown.
1 2 3 4 5 6 7 8 9 10 11 12 13 | # load Heston's model
hmod <- sde.examples("hest")
# single input
x0 <- c(X = log(1000), Z = 0.1)
theta <- c(alpha = 0.1, gamma = 1, beta = 0.8, sigma = 0.6, rho = -0.8)
sde.drift(model = hmod, x = x0, theta = theta)
# multiple inputs
nreps <- 10
Theta <- apply(t(replicate(nreps,theta)),2,jitter)
X0 <- apply(t(replicate(nreps,x0)),2,jitter)
sde.drift(model = hmod, x = X0, theta = Theta)
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