new package, unit

That library have constants about units prefixes.

Discussed on:
http://groups.google.com/group/golang-nuts/browse_thread/thread/7a313ad1c23b2c


It should be under math, and would be imported as
  import "math/unit"

[Joan Miller, 2010-04-06 12:58:30]

Makefile

[r2, 2010-04-06 18:37:38]

These don't seem useful enough for official placement in the  
libraries.   And if they were, a subdirectory of math would not be  
right; Kilo has nothing to do with transcendental calculations and the  
like.

-rob

On Apr 6, 2010, at 5:57 AM, peloko45@gmail.com wrote:

> Reviewers: ,
>
> Description:
> That library have constants about units prefixes.
>
> Discussed on:
> http://groups.google.com/group/golang-nuts/browse_thread/thread/7a313ad1c23b2c
>
>
> It should be under math, and would be imported as
>  import "math/unit"
>
>
> Please review this at http://codereview.appspot.com/891042/show
>
> Affected files:
>  src/pkg/math/unit/unit.go
>
>
> Index: src/pkg/math/unit/unit.go
> ===================================================================
> new file mode 100644
> --- /dev/null
> +++ b/src/pkg/math/unit/unit.go
> @@ -0,0 +1,48 @@
> +// Copyright 2009 The Go Authors. All rights reserved.
> +// Use of this source code is governed by a BSD-style
> +// license that can be found in the LICENSE file.
> +
> +
> +package unit
> +
> +
> +/* Standard prefixes from the International System of Units (SI).
> +In computer, the positive units are generally used for storage.
> +*/
> +const (
> +	Deka  = 1e1   // da
> +	Hecto = 1e2   // h
> +	Kilo  = 1e3   // k
> +	Mega  = 1e6   // M
> +	Giga  = 1e9   // G
> +	Tera  = 1e12  // T
> +	Peta  = 1e15  // P
> +	Exa   = 1e18  // E
> +	Zetta = 1e21  // Z
> +	Yotta = 1e24  // Y
> +	// Negative units
> +	Deci  = 1e-1   // d
> +	Centi = 1e-2   // c
> +	Milli = 1e-3   // m
> +	Micro = 1e-6   // µ
> +	Nano  = 1e-9   // n
> +	Pico  = 1e-12  // p
> +	Femto = 1e-15  // f
> +	Atto  = 1e-18  // a
> +	Zepto = 1e-21  // z
> +	Yocto = 1e-24  // y
> +)
> +
> +/* Prefixes from the National Institute of Standards and Technology  
> (IEC).
> +These prefixes for binary will better express electronic information.
> +Generally used for computer memory.
> +*/
> +const (
> +	Kibi = 1 << (10 * (iota + 1))  // Ki
> +	Mebi = 1 << (10 * (iota + 1))  // Mi
> +	Gibi = 1 << (10 * (iota + 1))  // Gi
> +	Tebi = 1 << (10 * (iota + 1))  // Ti
> +	Pebi = 1 << (10 * (iota + 1))  // Pi
> +	Exbi = 1 << (10 * (iota + 1))  // Ei
> +)
> +
>
>

[Joan Miller, 2010-04-06 21:25:21]

On 2010/04/06 18:37:38, r2 wrote:
> These don't seem useful enough for official placement in the  
> libraries.   And if they were, a subdirectory of math would not be  
> right; Kilo has nothing to do with transcendental calculations and the  
> like.
Ok. All my Go tools will be into an external package.

What subdirectory name do you suggest to place that package? (unit.go)