Successfully reported this slideshow.
Your SlideShare is downloading. ×

Clustering com numpy e cython

Ad
Ad
Ad
Ad
Ad
Ad
Ad
Ad
Ad
Ad
Ad
Loading in …3
×

Check these out next

1 of 15 Ad

More Related Content

Slideshows for you (20)

Advertisement

Similar to Clustering com numpy e cython (20)

Clustering com numpy e cython

  1. 1. Clustering com numpy e Cython Anderson Berg XIII Encontro do PUG-PE
  2. 2. Agrupamento de dados
  3. 3. K-Means
  4. 4. Matrizes
  5. 5. Exemplo simples >>> from numpy import * >>>a = arange(10).reshape(2,5) >>>a array([[0, 1, 2, 3, 4], [5, 6, 7, 8, 9]])
  6. 6. Criação de arrays >>> a = array( [2,3,4] ) >>> b = array( [ (1.5,2,3), (4,5,6) ] ) >>> b array([[ 1.5, 2. , 3. ], [ 4. , 5. , 6. ]]) >>> zeros( (3,4) ) array([[0., 0., 0., 0.], [0., 0., 0., 0.], [0., 0., 0., 0.]]) >>> ones( (2,3,4), dtype=int16 ) array([[[ 1, 1, 1, 1], [ 1, 1, 1, 1], [ 1, 1, 1, 1]], [[ 1, 1, 1, 1], [ 1, 1, 1, 1], [ 1, 1, 1, 1]]], dtype=int16)
  7. 7. Outras Operações >>> b = arange( 4 ) >>> b**2 array([0, 1, 4, 9]) >>> a = random.random((2,3)) >>> a array([[ 0.6903007 , 0.39168346, 0.16524769], [ 0.48819875, 0.77188505, 0.94792155]])
  8. 8. Ainda outras operações >>> a.sum() 3.4552372100521485 >>> a.min() 0.16524768654743593 >>> a.max() 0.9479215542670073 >>> a[:,1] array([0.39168346, 0.77188505]) >>> sum(a[:,1]) 1.1635685099999999
  9. 9. Primeiros Passos helloworld.pyx: print "Hello World" setup.py: from distutils.core import setup from distutils.extension import Extension from Cython.Distutils import build_ext setup( cmdclass = {'build_ext': build_ext}, ext_modules = [Extension("helloworld", ["helloworld.pyx"])] ) $ python setup.py build_ext --inplace >>> import helloworld Hello World
  10. 10. Advanced Mode def primes(int kmax): cdef int n, k, i cdef int p[1000] result = [] if kmax > 1000: kmax = 1000 k = 0 n = 2 while k < kmax: i = 0 while i < k and n % p[i] != 0: i = i + 1 if i == k: p[k] = n k = k + 1 result.append(n) n = n + 1 return result
  11. 11. Sem Cython Com Cython
  12. 12. Clustering com numpy e Cython Anderson Berg - @berg_pe XIII Encontro do PUG-PE

×