cooltools (version 2.4)

is.equal: Numerical equality check

Description

Checks if two or more numerical values are identical within a relative numerical tolerance

Usage

is.equal(x, ..., stoptext = NULL, eps = sqrt(.Machine$double.eps))

Value

Returns a logical value. TRUE means that all values of x are equal within the specified relative tolerance; also returns TRUE if all values are Inf or NA or NaN.

Arguments

x

vector or array of values to compare

...

optional additional values to compare

stoptext

optional character string; if given, the routine stops if the values are not all equal and adds the character string to the error message

eps

relative numerical tolerance

Author

Danail Obreschkow

Examples

# almost identical values
x = c(acos(1/sqrt(2)),pi/4)
print(x)
print(x[1]==x[2])
print(is.equal(x))

# various other examples
print(is.equal(1,2,3))
print(is.equal(1,NA,3))
print(is.equal(Inf,NA))
print(is.equal(NaN,NA))
print(is.equal(NaN,Inf))
print(is.equal(Inf,Inf,Inf))
print(is.equal(NA,NA))
print(is.equal(NaN,NaN))
print(is.equal(1.4,1.4))
print(is.equal(1.4,1.400000001))
print(is.equal(1.4,1.400000001,1.41))
print(is.equal(0,0,0,0))