is.zero: Tests if something is zero or not
In 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`	An R object
`eps`	The minimal numerical value which will not be treated as zero

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

Numerical types can be compared by absolute value with eps.
Other types should define its own method.

By befault eps = {r} ZERO_EPS

TRUE if the object can be treat as zero

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