# Source

 ``` 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81``` ```ipython-physics --------------- This is an extension for IPython 0.11+ that at the moment mainly enables easy input of physical quantities (i.e. numbers with units). If the "uncertainties" module (http://github.com/newville/uncertainties/) is installed, you can also enter values with standard errors wherever you can enter quantities, see the examples below. Quick installation advice: Place `physics.py` in any directory on PYTHONPATH, or add its directory to `sys.path` in your IPython `ipython_config.py` file. Then you can load it either in the config file or on the command line as described here: http://ipython.org/ipython-doc/dev/config/extensions/index.html Quick usage examples: In: 1 m // cm # convert between units Out: 100 cm # (syntax inspired by Mathematica) In: (1 m)/(1 s) # sugar for inline quantity input Out: 1 m/s # in arbitrary expressions In: Quantity('1 m')/Qantity('1 s') # this is the desugared form Out: 1 m/s In: // furlong/fortnight # convert units in last result Out: 6012.8848 furlong/fortnight In: alpha = 90 deg # more sugar for assignment: no # parentheses needed In: sin(alpha) # angle units work with NumPy Out: 1.0 # trigonometric functions In: m = 80 +/- 5 kg # calculating with uncertainties In: v = 130 +/- 10 m/s # (needs the "uncertainties" module) In: 0.5 * m * v**2 // kJ Out: 676 +/- 112.25445 kJ In: %tbl sqrt(?x**2 + ?y**2) // cm # quickly tabulate a formula: x = 1 m # provide some values y = 2 m Out: 223.6068 cm # and get the result x = 3 m # ... this continues as long as you y = 4 m # enter new values Out: 500 cm In: c0 # important physical constants Out: 2.9979246e+08 m/s In: setprec(4) # set the display precision In: c0 Out: 2.998e+08 m/s The predefined constants are: pi e c0 -- vacuum speed of light mu0 -- magnetic constant eps0 -- electric constant Grav -- Newton's constant hpl -- Planck's constant hbar -- Planck's constant / 2pi e0 -- elementary charge me -- electron mass mp -- proton mass mn -- neutron mass NA -- Avogadro's number kb -- Boltzmann constant g0 -- Standard earth gravity R -- Universal gas constant alpha -- fine structure constant Ry -- Rydberg constant mu_n -- Magnetic moment of the neutron gamma -- Gyromagnetic ratio of the neutron h0 -- dimensionless Hubble parameter Please let me know if anything is missing. ```