CVXR (version 0.99-7)

sign-methods: Sign Properties

Description

Determine if an expression is positive, negative, or zero.

Usage

is_zero(object)
is_positive(object)
is_negative(object)

Arguments

object

An '>Expression object.

Value

A logical value.

Examples

# NOT RUN {
pos <- Constant(1)
neg <- Constant(-1)
zero <- Constant(0)
unknown <- Variable()

is_zero(pos)
is_zero(-zero)
is_zero(unknown)
is_zero(pos + neg)

is_positive(pos + zero)
is_positive(pos * neg)
is_positive(pos - neg)
is_positive(unknown)

is_negative(-pos)
is_negative(pos + neg)
is_negative(neg * zero)
is_negative(neg - pos)
# }