Unit conversions: Difference between revisions

Revision as of 05:48, 3 June 2012

This page is a knowledge crystal of subtype method. The page identifier is Op_en5475
Moderator:Jouni (see all)
This page is a stub. You may improve it into a full page.
Upload data {{#opasnet_base_link:Op_en5475}}

The code related to this tool is now a part of Opasnet (R library).

Question

How to convert data from one unit to another in R?

Answer

We need conversion factors, which are listed below, and a code that does the actual conversion.

Unit conversions: Difference between revisions(-)
Obs	From	To	Type	Result	Description
1			Prefix	1
2	da		Prefix	10	deca
3	h		Prefix	100	hecto
4	k		Prefix	1000	kilo
5	M		Prefix	1+e6	mega
6	G		Prefix	1+e9	giga
7	T		Prefix	1+e12	tera
8	P		Prefix	1+e15	peta
9	E		Prefix	1+e18	exa
10	Z		Prefix	1+e21	zetta
11	Y		Prefix	1+e24	yotta
12	d		Prefix	0.1	deci
13	c		Prefix	0.01	centi
14	m		Prefix	0.001	milli
15	μ		Prefix	1e-6	micro
16	u		Prefix	1e-6	micro
17	n		Prefix	1e-9	nano
18	p		Prefix	1e-12	pico
19	f		Prefix	1e-15	femto
20	a		Prefix	1e-18	atto
21	z		Prefix	1e-21	zepto
22	y		Prefix	1e-24	yocto
23	J	J	Unit	1	Joule, the base unit for energy
24	Wh	J	Unit	3600	1 Wh = 1 Wh * 3600 s/h = 3600 Ws = 3600 MJ
25	toe	J	Unit	3.5e+10	1 toe = 1000 kgoe = 1000 kg * 35 MJ/kg = 35000 MJ (energy as tons of oil equivalent)
26	g	g	Unit	1	gram, the base unit for mass (although the definition is based on kg)
27	ton	g	Unit	1e+6	metric ton
28	tn	g	Unit	1e+6	metric ton
29	s	s	Unit	1	second, the base unit for time
30	min	s	Unit	60	minute
31	h	s	Unit	3600	hour
32	d	s	Unit	86400	day
33	a	s	Unit	31557600	year (assuming 365.25 days per year)
34	m	m	Unit	1	metre, the base unit of length
35	in	m	Unit	0.0254	inch (strangely, some people still use these)
36	ft	m	Unit	0.3048	foot = 12 inches
37	mi	m	Unit	1609.344	mile = 5280 feet
38	m3	m3	Unit	1	cubic metre, the basic unit of colume
39	l	m3	Unit	1000	litre
40	m^3	Unit	m3	1

+ Show code - Hide code

out <- convert.units(amount, tounit, fromunit)

cat(paste(amount, fromunit, "=", out, tounit))

Rationale

References

Related files

@@ Line 12: / Line 12: @@
 We need conversion factors, which are listed below, and a code that does the actual conversion.
-<t2b index="From,To,Observation" locations="Result,Description" unit="-">
+<t2b index="From,To,Type,Observation" locations="Result,Description" unit="-">
-MWh|MJ|3600|1 MWh = 1 MWh * 3600 s/h = 3600 MWs = 3600 MJ
+||Prefix|1|
-toe|MJ|35000|1 toe = 1000 kgoe = 1000 kg * 35 MJ/kg = 35000 MJ
+da||Prefix|10|deca
-mg/MWh|mg/MJ|0.00027777777778|1/3600
+h||Prefix|100|hecto
-kg/MWh|kg/GJ|0.27777777778|1/3.6
+k||Prefix|1000|kilo
-kg/MWh|tn/TJ|0.27777777778|0.001 tn/kg / 0.0036 TJ/kWh
+M||Prefix|1+e6|mega
-kg/MWh|tn/MJ|0.00000027777777778|0.001 tn/kg / 3600 MJ/MWh
+G||Prefix|1+e9|giga
+T||Prefix|1+e12|tera
+P||Prefix|1+e15|peta
+E||Prefix|1+e18|exa
+Z||Prefix|1+e21|zetta
+Y||Prefix|1+e24|yotta
+d||Prefix|0.1|deci
+c||Prefix|0.01|centi
+m||Prefix|0.001|milli
+μ||Prefix|1e-6|micro
+u||Prefix|1e-6|micro
+n||Prefix|1e-9|nano
+p||Prefix|1e-12|pico
+f||Prefix|1e-15|femto
+a||Prefix|1e-18|atto
+z||Prefix|1e-21|zepto
+y||Prefix|1e-24|yocto
+J|J|Unit|1|Joule, the base unit for energy
+Wh|J|Unit|3600|1 Wh = 1 Wh * 3600 s/h = 3600 Ws = 3600 MJ
+toe|J|Unit|3.5e+10|1 toe = 1000 kgoe = 1000 kg * 35 MJ/kg = 35000 MJ (energy as tons of oil equivalent)
+g|g|Unit|1|gram, the base unit for mass (although the definition is based on kg)
+ton|g|Unit|1e+6|metric ton
+tn|g|Unit|1e+6|metric ton
+s|s|Unit|1|second, the base unit for time
+min|s|Unit|60|minute
+h|s|Unit|3600|hour
+d|s|Unit|86400|day
+a|s|Unit|31557600|year (assuming 365.25 days per year)
+m|m|Unit|1|metre, the base unit of length
+in|m|Unit|0.0254|inch (strangely, some people still use these)
+ft|m|Unit|0.3048|foot = 12 inches
+mi|m|Unit|1609.344|mile = 5280 feet
+m3|m3|Unit|1|cubic metre, the basic unit of colume
+l|m3|Unit|1000|litre
+m^3|Unit|m3|1|
 </t2b>
-{{attack|# |Explanations. Do these make sense?|--[[User:Jouni|Jouni]] 11:43, 1 June 2012 (EEST)}}{{defend|# |Yes.|--[[User:Marjo|Marjo]] 14:39, 1 June 2012 (EEST)}}
+<rcode include="page:Opasnet_(R_library)|name:answer"
+variables="
+	name:amount|description:What is the amount?|
+	name:fromunit|description:In what units is it?|type:text|
+	name:tounit|description:To what unit do you want it?|type:text
+">
+out <- convert.units(amount, tounit, fromunit)
+cat(paste(amount, fromunit, "=", out, tounit))
+</rcode>
 ==Rationale==