[song] rebirth of me in py introductory training (10): numpy

It's not easy to create , Before reference , Point a praise , Collection , You can't pay too much attention , Family

The first 1 Turn off ：Numpy Create array

Task description

The small goal of this level is , Use Numpy Create a multidimensional array .

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Programming requirements

The task of this pass is , Complete the right editor Begin-End Interval code , To create a m*n The function of multidimensional array . The specific requirements are as follows ：

• The function takes two arguments , Then create the corresponding multidimensional array ;

• See the following... For the test examples of this level .

    
      #  Please add the code to create multidimensional array here and assign it to ret
      #********** Begin *********#
      b=np.arange(n);
      ret = np.array([b]*m)
      #********** End **********#

  The first 2 Turn off ：Numpy The basic operation of array

Task description

The small goal of this level is , Learn to Numpy Some basic operations of two-dimensional array .

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Programming requirements

The task of this pass is , Complete the right editor Begin-End Interval code , To realize the function of adding and multiplying vectors and scalars . The specific requirements are as follows ：

• The function takes three arguments , Then the operation between vector and scalar

    #********** Begin *********#
    ret = m+b[n]
      #********** End **********#

    return ret
#  Definition opemul function 
def opemul(m,b,n):
    '''
     Parameters ：
    m: Is an array 
    b: It's a list 
    n: Is the index in the list 
     What you need to do is  m*b[n]
     Return value :
    ret:  One numpy Array 
    '''
    ret = 0

    #********** Begin *********#
    ret = m*b[n]
    #********** End **********#
    return ret

The first 3 Turn off ：Numpy Slicing and indexing of arrays

Task description

The small goal of this level is , Select the specified element from the array .

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Programming requirements

The task of this pass is , In the editor on the right Begin-End Interval code , In order to realize the Numpy The index function of array . The specific requirements are as follows ：

• The function takes two arguments , Then return the specified element found by the slice

      #  Please add the code of the slice here , To find out the multidimensional array a pass the civil examinations m The first part of an array n Elements   And assign it to ret
      #********** Begin *********#
      ret = a[m,:n]
      #********** End **********#
      return ret
  

The first 4 Turn off ：Numpy Stack of arrays

Task description

The goal of this level is , change Numpy The shape of the array .

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Programming requirements

The task of this pass is , Complete the right editor Begin-End Interval code , respectively Numpy Vertical superposition of arrays 、 Horizontal superposition 、 Depth overlay . The specific requirements are as follows ：

• The function takes two arguments , Then the two parameters are superimposed ;

 #  Please add code here to realize the vertical superposition of the array and assign it to ret
    #********** Begin *********#
    ret = np.vstack((m,n))
    #********** End **********#
    return ret
#  Definition darray function 
def  darray(m,n):
    '''
     Parameters ：
    m： Is the first array 
    n： Is the second array 
     Return value :
    ret:  One numpy Array 
    '''
    ret = 0
    #  Please add code here to realize the depth superposition of the array and assign it to ret
    #********** Begin *********#
    ret = np.dstack((m,n))
    #********** End **********#
    return ret
 #  Definition harray function 
def  harray(m,n):
    '''
     Parameters ：
    m： Is the first array 
    n： Is the second array 
     Return value :
    ret:  One numpy Array 
    '''
    ret = 0
    #  Please add code here to realize the horizontal superposition of the array and assign it to ret
    #********** Begin *********#

    #********** End **********#
    return ret

The first 5 Turn off ：Numpy The split

Task description

The goal of this level is , Yes Numpy Split the array .

-----------------------------------------------------------------

Programming requirements

The task of this pass is , Complete the right editor Begin-End Interval code , respectively Numpy Vertical split of array 、 Horizontal resolution 、 Deep split . The specific requirements are as follows ：

• Function takes an argument , Then split the array

•    #  Please add code here to realize the vertical splitting of the array and assign it to ret
      #********** Begin *********#
      ret = np.vsplit(m,n)
      #********** End **********#
      return ret
  #  Definition darray function 
  def  dsarray(m,n):
      '''
       Parameters ：
      m： Is the first array 
      n： It is the dimension that needs to be split 
       Return value :
      ret:  One numpy Array 
      '''
      ret = 0
      #  Please add code here to realize the deep splitting of the array and assign it to ret
      #********** Begin *********#
      ret = np,dsplit(m,n)
      #********** End **********#
      return ret
   #  Definition harray function 
  def  hsarray(m,n):
      '''
       Parameters ：
      m： Is the first array 
      n： It is the dimension that needs to be split 
       Return value :
      ret:  One numpy Array 
      '''
      ret = 0
      #  Please add code here to realize the horizontal splitting of the array and assign it to ret
      #********** Begin *********#
      ret = np.hsplit(m,n)
      #********** End **********#
      return ret

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