parvec: Parameter vector

In dMod: Dynamic Modeling and Parameter Estimation in ODE Models

Description

A parameter vector is a named numeric vector (the parameter values) together with a "deriv" attribute (the Jacobian of a parameter transformation by which the parameter vector was generated).

Usage

parvec(..., deriv = NULL)

as.parvec(x, ...)

## S3 method for class 'numeric'
as.parvec(x, names = NULL, deriv = NULL, ...)

## S3 method for class 'parvec'
x[..., drop = FALSE]

## S3 method for class 'parvec'
c(...)

Arguments

...	objects to be concatenated
deriv	matrix with rownames (according to names of ...) and colnames according to the names of the parameter by which the parameter vector was generated.
x	numeric or named numeric, the parameter values
names	optional character vector, the parameter names. Otherwise, names are taken from x.
drop	logical, drop empty columns in Jacobian after subsetting. ATTENTION: Be careful with this option. The default behavior is to keep the columns in the Jacobian. This can lead to unintended results when subsetting the parvec and using it e.g. in another parameter transformation.

Value

An object of class parvec, i.e. a named numeric vector with attribute "deriv".

Examples

# Generate a parameter vector
v <- parvec(a = 2, b = 3)
print(v)
print(getDerivs(v))

# Parameter vector from a named numeric
M <- matrix(c(1, 1, 0, 1), 
	    nrow = 2, ncol = 2, 
	    dimnames = list(c("a", "b"), c("A", "B"))
    )
v <- as.parvec(x = c(a = 2, b = 3), deriv = M)
print(v)
print(getDerivs(v))

# Subsetting of parameter vectors
# Case 1: Dependencies in the Jacobian are maintained
w <- v[1]
print(w)
print(getDerivs(w))

# Case 2: Dependencies are dropped
w <- v[1, drop = TRUE]
print(w)
print(getDerivs(w))

# Concatenating parameter vectors
w <- parvec(c = 4, d = 5)
print(c(v, w))
print(getDerivs(c(v, w)))

dMod documentation built on Jan. 27, 2021, 1:07 a.m.