is.zero: Test if something is zero
In namezys/polymatrix: Infrastructure for Manipulation Polynomial Matrices

Description Usage Arguments Details Value Methods (by class) See Also Examples

Generic function to check if we can treat on object as being zero. For matrices the result is a matrix of the same size.

is.zero(x, eps = ZERO_EPS)

## S4 method for signature 'polynomial'
is.zero(x, eps = ZERO_EPS)

## S4 method for signature 'polyMatrix'
is.zero(x, eps = ZERO_EPS)

`x`	The checked object
`eps`	Minimal numerical value which will not treat as zero

Different type of objects can be treated as a zero in different ways:

Numerical types can be compare by absolute value with eps.
Customer types should define an an customer method.

By befault eps:

ZERO_EPS

1	## [1] 1e-05

TRUE if the object can be treat as zero

polynomial: a polynomail can be treated as zero if all its coefficients can be treated as zero
polyMatrix: for a polunomial matrix every item is checked as polynomial

zero.round()

# numericals and matrices
is.zero(0) ## TRUE
is.zero(0.0001, eps=0.01) ## TRUE
is.zero(c(0, 1, 0)) ## TRUE, FALSE, TRUE
is.zero(matrix(c(1, 9, 0, 0), 2, 2))
# FALSE TRUE
# FALSE TRUE


# polynomials
is.zero(parse.polynomial("0.1 - 0.5 x")) ## FALSE
is.zero(parse.polynomial("0.0001 - 0.0005 x + 0.00002 x^2"), eps=0.01) ## TRUE