mjo/misc.py

   1 """
   2 Stuff that doesn't fit anywhere else.
   3 """
   4
   5 from sage.all import *
   6 from functools import reduce
   7
   8
   9 def legend_latex(obj):
  10     """
  11     Return the LaTeX representation of ``obj``, but wrap it in dollar
  12     ($) signs so that we can pass it directly to plot() et al. as a
  13     legend label.
  14     """
  15     return '$%s$' % latex(obj)
  16
  17
  18 def product(factors):
  19     """
  20     Returns the product of the elements in the list ``factors``. If
  21     the list is empty, we return 1.
  22
  23     EXAMPLES:
  24
  25     Normal integer multiplication::
  26
  27         sage: product([1,2,3])
  28         6
  29
  30     And with symbolic variables::
  31
  32         sage: x,y,z = SR.var('x,y,z')
  33         sage: product([x,y,z])
  34         x*y*z
  35
  36     TESTS:
  37
  38     The empty product is the multiplicative identity (one)::
  39
  40         sage: product([])
  41         1
  42
  43     """
  44     return reduce(operator.mul, factors, 1)