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.
1 2 3 4 5 6 7 
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
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15  # 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

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