Getting Started

Documentation

Glish

Learn More

Programming

Contact Us

Version 1.9 Build 1488

News	FAQ
Search	Home

quanta.map - Function

	Package	general
	Module	quanta
	Tool	quanta

list known unit names and constants

Synopsis
map(v)

Arguments

v	in	type of information to list
		Allowed:	coded string
		Default:	'all'

Returns
string

Description
map lists the known mapping of units and constants. It has a single argument, which can be a coded string (no-case, minimax match):

all

all of the following units (not constants): also the default

Prefix

known decimal prefixes

SI

known SI units

Customary

a set of customary units known to programs

User

units defined by the user

Constants

known constants (note: only 'const', 'Const', 'constants' and 'Constants' recognised).

Example

- dq.map('pre')			# list decimal prefixes
        == Prefix ==== 20 ====
        E         (exa)                        1e+18
        G         (giga)                       1000000000
        M         (mega)                       1000000
        P         (peta)                       1e+15
        T         (tera)                       1e+12
        Y         (yotta)                      1e+24
        Z         (zetta)                      1e+21
        a         (atto)                       1e-18
        c         (centi)                      0.01
        d         (deci)                       0.1
        da        (deka)                       10
        f         (femto)                      1e-15
        h         (hecto)                      100
        k         (kilo)                       1000
        m         (milli)                      0.001
        n         (nano)                       1e-09
        p         (pico)                       1e-12
        u         (micro)                      1e-06
        y         (yocto)                      1e-24
        z         (zepto)                      1e-21
- dq.map('Constants')			# list known constants
        == Constants ====
        pi    3.14..                    3.14159 
        ee    2.71..                    2.71828 
        c     light vel.                2.99792e+08 m/s
        G     grav. const               6.67259e-11 N.m2/kg2
        h     Planck const              6.62608e-34 J.s
        HI    HI line                   1420.41 MHz
        R     gas const                 8.31451 J/K/mol
        NA    Avogadro #                6.02214e+23 mol-1
        e     electron charge           1.60218e-19 C
        mp    proton mass               1.67262e-27 kg
        mp_me mp/me                     1836.15 
        mu0   permeability vac.         1.25664e-06 H/m
        eps0  permittivity vac.         1.60218e-19 C
        k     Boltzmann const           1.38066e-23 J/K
        F     Faraday const             96485.3 C/mol
        me    electron mass             9.10939e-31 kg
        re    electron radius           2.8179e-15 m
        a0    Bohr's radius             5.2918e-11 m
        R0    solar radius              6.9599e+08 m
        k2    IAU grav. const^2         0.000295912 AU3/d2/S0