Release Name: 0.3.8
Notes:
This library handles unit conversions and unit math
Changes:
Change Log for Ruby-units
=========================
2006-08-22 0.1.0 * Initial Release
2006-08-22 0.1.1 * Added new format option "1 mm".to_unit("in") now
converts the result to the indicated units
* Fixed some naming issues so that the gem name matches
the require name.
* Added CHANGELOG
* Improved test coverage (100% code coverage via RCov)
* fixed a bug that prevented units with a prefix in the
denominator from converting properly
* can use .unit method on a string to create a new unit
object
* can now coerce or define units from arrays, strings,
numerics.
"1 mm".unit + [1, 'mm'] === "2 mm".unit
[1,'mm','s'].unit === "1 mm/s".unit
2.5.unit === "2.5".unit
* Added instructions on how to add custom units
2006-08-28 0.2.0 * Added 'ruby_unit.rb' file so that requires will still
work if the wrong name is used
* Added 'to' as an alias to '>>' so conversions can be
done as '1 m'.unit.to('1 cm')
* Added ability to convert temperatures to absolute values
using the following syntax:
'37 degC'.unit.to('tempF') #=> '98.6 degF'.unit
* Tweaked abbreviations a bit. 'ton' is now 'tn' instead
of 't'. It was causing parse collisions with 'atm'.
* fixed a bug in term elimination routine
* fixed a bug in parsing of powers, and added support for
'm**2' format
* Added support for taking roots of units. Just
exponentiate with a fraction (0.5, 1.0/3, 0.25)
* renamed 'quantity' to 'scalar'
* any type of Numeric can be used to initialize a Unit,
although this can't really be done with a string
* Units can not be forced to a float using to_f unless
they are unitless. This prevents some math functions
from forcing the conversion. To get the scalar, just
use 'unit.scalar'
* 'inspect' returns string representation
* better edge-case detection with math functions.
"0 mm".unit**-1 now throws a ZeroDivisionError exception
* Ranges can make a series of units, so long as the end
points have integer scalars.
* Fixed a parsing bug with feet/pounds and scientific
numbers
2006-09-17 * can now use the '%' format specifier like
'%0.2f' % '1 mm'.unit #=> '1.00 mm'
* works nicely with time now.
'1 week'.unit + Time.now => 1.159e+09 s
Time.at('1.159e+09 s'.unit)
=> Sat Sep 23 04:26:40 EDT 2006
"1.159e9 s".unit.time
=> Sat Sep 23 04:26:40 EDT 2006
* Time.now.unit => 1.159e9 s
* works well with 'Uncertain' numerics
(www.rubyforge.org/projects/uncertain)
* Improved parsing
2006-09-18 0.2.1 * Trig math functions (sin, cos, tan, sinh, cosh, tanh)
accept units that can be converted to radians
Math.sin("90 deg".unit) => 1.0
* Date and DateTime can be offset by a time unit
(Date.today + "1 day".unit) => 2006-09-19
Does not work with months since they aren't a consistent
size
* Tweaked time usage a bit
Time.now + "1 hr".unit => Mon Sep 18 11:51:29 EDT 2006
* can output time in 'hh:mm:ss' format by using
'unit.to_s(:time)'
* added time helper methods
ago,
since(Time/DateTime),
until(Time/DateTime),
from(Time/DateTime),
before(Time/DateTime), and
after(Time/DateTime)
* Time helpers also work on strings. In this case they
are first converted to units
'5 min'.from_now
'1 week'.ago
'min'.since(time)
'min'.until(time)
'1 day'.from()
* Can pass Strings to time helpers and they will be parsed
with ParseDate
* Fixed most parsing bugs (I think)
* Can pass a strftime format string to to_s to format time
output
* can use U'1 mm' or '1 mm'.u to specify units now
2006-09-19 0.2.2 * tweaked temperature handling a bit. Now enter
temperatures like this:
'0 tempC'.unit #=> 273.15 degK
They will always be converted to kelvin to avoid
problems when temperatures are used in equations.
* added Time.in("5 min")
* added Unit.to_unit to simplify some calls
2006-09-22 0.2.3 * added support for date/time parsing with the Chronic gem
parsing will use Chronic if it is loaded
* allows Date / Time / DateTime conversions
* better test coverage
* The 'string'.to_time returns a Time object
* 'string'.to_datetime returns a DateTime object
* 'string'.time returns a Time object or a DateTime if the
Time object fails
* 'string'.datetime returns a DateTime or a Time if the
DateTime fails
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