Insert a joke about Glossolalia and snakes.
Run commands in bash and get useful representations back:
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files = !ls
files
or run multiple lines in a cell that is all bash
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%%bash
uname -a
echo $PWD
Cython is an optimising static compiler for both the Python programming language and the extended Cython programming language (based on Pyrex). It makes writing C extensions for Python as easy as Python itself.
Quasi random numbers, Tim's knowledge on wrapping C/C++ libraries for easy use from python
TL;DR: use python syntax, get C speed.
Load the cython extension. Read more about ipython extensions
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# requires `conda install cython`
%load_ext Cython
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def f(x):
return x**2-x
def integrate_f(a, b, N):
s = 0; dx = (b-a)/N
for i in range(N):
s += f(a+i*dx)
return s * dx
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%%cython
cdef double fcy(double x) except? -2:
return x**2-x
def integrate_fcy(double a, double b, int N):
cdef int i
cdef double s, dx
s = 0; dx = (b-a)/N
for i in range(N):
s += fcy(a+i*dx)
return s * dx
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%timeit integrate_f(0, 1, 100)
%timeit integrate_fcy(0, 1, 100)
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%%cython?
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%%cython -lm
# Link the m library (like g++ linker argument)
from libc.math cimport sin
print 'sin(1)=', sin(1)
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%%cython -a
cdef double fcy(double x) except? -2:
return x**2-x
def integrate_fcy(double a, double b, int N):
cdef int i
cdef double s, dx
s = 0; dx = (b-a)/N
for i in range(N):
s += fcy(a+i*dx)
return s * dx