unithelp
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Contents: Description, Arguments, Usage, Examples, Sub-Functions, Related Functions, Source Supported Under Version: >1.00
Description Displays description of un (unit conversion structure) This is a user-defined function from constants.dvrc
Arguments and Return Values Arguments: None; just enter unithelp() Return Value: Prints description of each element of structure un when not given any input; returns null for any input(s)
Usage Syntax: unithelp()
Examples dv> un
struct, 27 elements
in: 0.0254000
ft: 0.304800
mi: 1609.34
AU: 1.49598e+11
ly: 9.46073e+15
pc: 3.08568e+16
oz: 0.0283495
lb: 0.453592
day: 86400.0
Jyr: 3.15576e+07
floz: 2.95735e-05
L: 0.00100000
gal: 0.00378541
mph: 0.447040
ozf: 0.278014
lbf: 4.44822
cal: 4.18400
tTNT: 4.18400e+09
hp: 746.000
mbar: 100.000
torr: 133.322
psi: 6894.76
bar: 100000.
atm: 101325.
deg: 0.0174533
arcmin: 0.000290888
arcsec: 4.84814e-06
dv> unithelp()
unithelp() describes all unit conversion factors in structure un
S.Marshall 11-30-2010
Most of these values are from
http://www.nist.gov/pml/wmd/metric/upload/SP1038.pdf
via http://www.nist.gov/pml/wmd/metric/metric-pubs.cfm
Additional sources: http://ssd.jpl.nasa.gov/?constants
and http://www.iau.org/public/measuring/
Note that definitions vary for mile, pound, ounce, gallon,
calorie, and horsepower. Those used here are the most common.
The values here are the ratio of the non-SI unit to the
corresponding SI unit. For instance,
un.ft = 0.3048 = (one foot)/(one meter), so
(one foot) = (value of un.ft)*(one meter) = 0.3048 m
in = 0.0254 m Inch
ft = 0.3048 m Foot (12 inches)
mi = 1609.344 m Mile (5280 feet)
AU = 1.49597870691e+11 m Astronomical unit
ly = 9.4607304725808e+15 m Light-year (c*Jyr)
pc = 3.0856775813e+16 m Parsec
oz = 0.028349523125 kg Ounce mass (avoirdupois, 1/16 lb)
lb = 0.45359237 kg Pound mass (avoirdupois)
day = 86400 s Day (24 hours)
Jyr = 3.15576e+07 s Julian year (365.25 days)
floz = 2.95735295625e-05 m^3 Fluid ounce (1/128 gal)
L = 0.001 m^3 Liter
gal = 0.003785411784 m^3 US gallon (231 cubic inches)
mph = 0.44704 m/s Mile per hour
ozf = 0.278013850953781 N Ounce force
lbf = 4.4482216152605 N Pound force
cal = 4.184 J Calorie (thermochemical)
tTNT = 4.184e+09 J TNT equivalent tonne
hp = 746 W Horsepower (electric)
mbar = 100 Pa Millibar
torr = 133.322368421053 Pa Torr (1/760 atm)
psi = 6894.75729316836 Pa Pound per square inch
bar = 100000 Pa Bar
atm = 101325 Pa Standard atmosphere
deg = 0.0174532925199433 rad Degree (pi/180 radians)
arcmin = 2.908882086657216e-04 rad Arcminute (1/60 degree)
arcsec = 4.848136811095360e-06 rad Arcsecond (1/60 arcminute)
All except AU and pc are exact (to double precision)
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Recent Library Changes Created On: 12-02-2010 |
