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At some point or another, most programmers find they need to compare floating-point numbers for equality. The typical idiom is to test if the absolute value of the difference of the numbers is within a desired tolerance, usually called epsilon. This module provides such a function for use with Test::Harness. Usage is similar to other test functions described in Test::More. Semantically, the delta_within function replaces this kind of construct:
ok ( abs($p - $q) < $epsilon, '$p is equal to $q' ) or
diag "$p is not equal to $q to within $epsilon";
While there's nothing wrong with that construct, it's painful to type it repeatedly in a test script. This module does the same thing with a single function call. The delta_ok function is similar, but either uses a global default value for epsilon or else calculates a 'relative' epsilon on the fly so that epsilon is scaled automatically to the size of the arguments to delta_ok. Both functions are exported automatically.
Because checking floating-point equality is not always reliable, it is not possible to check the 'equal to' boundary of 'less than or equal to epsilon'. Therefore, Test::Number::Delta only compares if the absolute value of the difference is less than epsilon (for equality tests) or greater than epsilon (for inequality tests).
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perl-Test-Number-Delta: Test::Number::Delta - Compare the difference between numbers against a given tolerance
At some point or another, most programmers find they need to compare floating-point numbers for equality. The typical idiom is to test if the absolute value of the difference of the numbers is within a desired tolerance, usually called epsilon. This module provides such a function for use with Test::Harness. Usage is similar to other test functions described in Test::More. Semantically, the delta_within function replaces this kind of construct:ok ( abs($p - $q) < $epsilon, '$p is equal to $q' ) or
diag "$p is not equal to $q to within $epsilon";
While there's nothing wrong with that construct, it's painful to type it repeatedly in a test script. This module does the same thing with a single function call. The delta_ok function is similar, but either uses a global default value for epsilon or else calculates a 'relative' epsilon on the fly so that epsilon is scaled automatically to the size of the arguments to delta_ok. Both functions are exported automatically.
Because checking floating-point equality is not always reliable, it is not possible to check the 'equal to' boundary of 'less than or equal to epsilon'. Therefore, Test::Number::Delta only compares if the absolute value of the difference is less than epsilon (for equality tests) or greater than epsilon (for inequality tests).
| Name: | perl-Test-Number-Delta |
| Release: | 1.06-2mamba |
| Architecture: | noarch |
| Group: | System/Libraries/Perl |
| Size: | 17.68 kB |
| Upstream URL: | https://www.cpan.org/ |
| Source RPM: | perl-Test-Number-Delta |
| Brothers | Provides | Obsoletes | Requires | Recommends |
|---|---|---|---|---|
| perl(Test::Number::Delta) = 0:1.06 perl-Test-Number-Delta = 0:1.06-2mamba | perl >= 0:5.36.0 [1] perl(Carp) [1] perl(Exporter) [1] perl(Test::Builder) [1] perl(strict) [1] perl(vars) [1] perl(warnings) [1] |