A <code>yr</code> object represents years with an associated calendar era or time scale.

Provides a consistent representation of year-based time scales as a
numeric vector with an associated 'era'. There are built-in era definitions
for many year numbering systems used in contemporary and historic calendars
(e.g. Common Era, Islamic 'Hijri' years); year-based time scales used in
archaeology, astronomy, geology, and other palaeosciences (e.g.
Before Present, SI-prefixed 'annus'); and support for arbitrary user-defined
eras. Years can converted from any one era to another using a generalised
transformation function. Methods are also provided for robust casting and
coercion between years and other numeric types, type-stable arithmetic with
years, and pretty-printing in tables.

Joe Roe

Year-Based Time Scales

yr function

<dl><dt>x</dt>
<dd>A numeric vector of years.</dd>
<dt>era</dt>
<dd>The calendar era used by <code>x</code>. Either:<ul>
<li>A string matching one of the standard era labels defined in <code>eras()</code></li>
<li>An <code>era</code> object constructed with <code>era()</code></li>
</ul></dd></dl>

Arguments

Create a vector of years with era — yr

<dl>

<dt>x</dt>
<dd>A numeric vector of years.</dd>


<dt>era</dt>
<dd>The calendar era used by <code>x</code>. Either:<ul>
<li>A string matching one of the standard era labels defined in <code>eras()</code></li>
<li>An <code>era</code> object constructed with <code>era()</code></li>
</ul></dd>

</dl>

yr: Create a vector of years with era

Description

Usage

Value

Arguments

See Also

Examples