import numpy as np x = np.array([[1, 2], [3, 4], [5, 6]]) y = x[[0,1,2], [0,1,0]] print (y)
import numpy as np x = np.array([[ 0, 1, 2],[ 3, 4, 5],[ 6, 7, 8],[ 9, 10, 11]]) print ('我们的数组是：' ) print (x) print ('\n') rows = np.array([[0,0],[3,3]]) cols = np.array([[0,2],[0,2]]) y = x[rows,cols] print ('这个数组的四个角元素是：') print (y)
import numpy as np a = np.array([[1,2,3], [4,5,6],[7,8,9]]) b = a[1:3, 1:3] c = a[1:3,[1,2]] d = a[...,1:] print(b) print(c) print(d)
import numpy as np x = np.array([[ 0, 1, 2],[ 3, 4, 5],[ 6, 7, 8],[ 9, 10, 11]]) print ('我们的数组是：') print (x) print ('\n') # 现在我们会打印出大于 5 的元素 print ('大于 5 的元素是：') print (x[x > 5])
import numpy as np a = np.array([np.nan, 1,2,np.nan,3,4,5]) print (a[~np.isnan(a)])
import numpy as np a = np.array([1, 2+6j, 5, 3.5+5j]) print (a[np.iscomplex(a)])
import numpy as np x=np.arange(32).reshape((8,4)) print (x[[4,2,1,7]])
x=np.arange(32).reshape((8,4)) print (x[[-4,-2,-1,-7]])
import numpy as np x=np.arange(32).reshape((8,4)) print (x[np.ix_([1,5,7,2],[0,3,1,2])])
