is.theta: Check if parameters are valid
In GMCM: Fast Estimation of Gaussian Mixture Copula Models

Description Usage Arguments Value Author(s) See Also Examples

Function to check whether the argument is coherent and in the correct format.

1	is.theta(theta, check.class = TRUE)

`theta`	A list on the `theta`-form described in `rtheta`
`check.class`	Logical. If `TRUE`, the class of `theta` is also checked.

logical. Returns TRUE if theta is coherent and in the correct format. Otherwise, the function returns FALSE with an accompanying warning message of the problem.

Anders Ellern Bilgrau <anders.ellern.bilgrau@gmail.com>

rtheta

theta1 <- rtheta()  # Create a random correctly formatted theta
is.theta(theta1)

theta2 <- rtheta(d = 3, m = 5)
theta2$m <- 6  # m is now incoherent with the number of components
is.theta(theta2)

theta3 <- rtheta(d = 4, m = 2)
theta3$sigma$comp1[1, 2] <- 0  # Making the covariance matrix non-symmetric
is.theta(theta3)

theta4 <- rtheta(d = 10, m = 10)
theta4$sigma$comp1[1, 1] <- 0  # Destroy positive semi-definiteness
is.theta(theta4)

theta5 <- rtheta()
names(theta5) <- c("m", "d", "prop", "mu", "sigmas") # Incorrect names
is.theta(theta5)