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Floating-point comparison operators

Source: R/operators.R
floating_point_comparisons.Rd

An important set of operators missing from base R. Using == on two non-integer numbers can give unexpected results (see examples), because of the way floating-point numbers are represented. These operators instead test equality up to a small tolerance, via all.equal.

For a fuller explanation, see https://docs.oracle.com/cd/E19957-01/806-3568/ncg_goldberg.html.

Usage

x %~=% y

x %>~% y

x %<~% y

Arguments

x

numeric

y

numeric

Value

A logical value.

See also

Other comparisons: comparisons

Author

Ben Wiseman, benjamin.h.wiseman@gmail.com

Examples

 ## Floating-point test of equality
 # base R:
 (0.1 + 0.1 + 0.1) == 0.3   # FALSE
#> [1] FALSE
 # with roperators:
 (0.1 + 0.1 + 0.1) %~=% 0.3 # TRUE
#> [1] TRUE

 # Note how the base >= and <= behave here:
 (0.1 + 0.1 + 0.1) %>=% 0.3 # TRUE
#> [1] TRUE
 (0.1 + 0.1 + 0.1) %<=% 0.3 # FALSE
#> [1] FALSE

 # Use %>~% and %<~% for greater/less than OR approximately equal
 (0.1 + 0.1 + 0.1) %>~% 0.3 # TRUE
#> [1] TRUE
 (0.1 + 0.1 + 0.1) %<~% 0.3 # TRUE
#> [1] TRUE