I'm trying to construct a hypergeometric pdf equation, using the nCr expression with parentheses (n over r) using Python's sympy latex package. Anyone know how to do this? Thanks, Joel
我正在尝试构建一个超几何pdf方程，使用带有圆括号的nCr表达式（n over r）使用Python的sympy latex包。有人知道怎么做吗？谢谢，乔尔
1 个解决方案
#1
2
I think you're looking for binomial:
我想你正在寻找二项式：
from sympy import binomial, latex
sympy.init_printing(use_latex='mathjax')
n, r = sympy.symbols("n, r", real=True, positive=True)
print latex(binomial(n, r) # outputs {\binom{n}{r}}
binomial(n, r)
This will output nCr (nicely) with parenthesis in an IPython shell or Jupyter notebook.
这将在IPython shell或Jupyter笔记本中输出带有括号的nCr（很好）。
If you want an actual value to be evaluated, you can do:
如果要评估实际值，可以执行以下操作：
from sympy import binomial, latex
sympy.init_printing(use_latex='mathjax')
n = 4
r = 2
binomial(n, r) # outputs 6
If you want the symbols 4 and 2 to be displayed, try:
如果要显示符号4和2，请尝试：
from sympy import binomial, latex
sympy.init_printing(use_latex='mathjax')
n, r = sympy.symbols("4, 2", real=True, positive=True)
binomial(n, r)
#1
2
I think you're looking for binomial:
我想你正在寻找二项式：
from sympy import binomial, latex
sympy.init_printing(use_latex='mathjax')
n, r = sympy.symbols("n, r", real=True, positive=True)
print latex(binomial(n, r) # outputs {\binom{n}{r}}
binomial(n, r)
This will output nCr (nicely) with parenthesis in an IPython shell or Jupyter notebook.
这将在IPython shell或Jupyter笔记本中输出带有括号的nCr（很好）。
If you want an actual value to be evaluated, you can do:
如果要评估实际值，可以执行以下操作：
from sympy import binomial, latex
sympy.init_printing(use_latex='mathjax')
n = 4
r = 2
binomial(n, r) # outputs 6
If you want the symbols 4 and 2 to be displayed, try:
如果要显示符号4和2，请尝试：
from sympy import binomial, latex
sympy.init_printing(use_latex='mathjax')
n, r = sympy.symbols("4, 2", real=True, positive=True)
binomial(n, r)