CVXR (version 0.99-7)

expression-parts: Parts of an Expression

Description

List the variables, parameters, or constants in a canonical expression.

Usage

variables(object)
parameters(object)
constants(object)

Arguments

object

A '>Canonical expression.

Value

A list of '>Variable, '>Parameter, or '>Constant objects.

Examples

# NOT RUN {
m <- 50
n <- 10
beta <- Variable(n)
y <- matrix(rnorm(m), nrow = m)
X <- matrix(rnorm(m*n), nrow = m, ncol = n)
lambda <- Parameter()

expr <- sum_squares(y - X %*% beta) + lambda*p_norm(beta, 1)
variables(expr)
parameters(expr)
constants(expr)
lapply(constants(expr), function(c) { value(c) })
# }