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import numpy as np

my_list = [1,2,3,4,5,6]

print(my_list)

#creating single dimension array of vector by casting python list to numPy array

npvector = np.array(my_list)

print(npvector)

my_mat = [[1,2,3],[4,5,6],[7,8,9]]

nptwodarray = np.array(my_mat)

print(nptwodarray)

print(np.arange(0,10))# python range like function to generate vector array

print(np.arange(0,10, 2))#with step

print(np.zeros(3))#generate single/vector array using zeros

print(np.zeros((3,3)))#generate 2d/matrix array using zeros or ones and passing arg as tuple

print(np.ones((3,3)))

print(np.linspace(0,5,10))

print(np.eye(3))

print(np.random.rand(5))

print(np.random.rand(3,3))

print(np.random.randn(3,3))

print(np.random.randn(3))

print(np.random.randint(0,10,3))

rangearr = np.arange(0,25)

print(rangearr)

print(rangearr.reshape((5,5)))

print(rangearr.min())

print(rangearr.max())

print(rangearr.argmax())

print(rangearr.argmin())

print("Index and Selection")

#numpy indexing and selection

indexarr = np.arange(0,11)

print(indexarr)

#indexing

print(indexarr[7])

#slicing

print(indexarr[2:4])

#slicing will change original instance as below

slice_of_arr = indexarr[0:5]

print(slice_of_arr)

slice_of_arr[:] = 0

print(slice_of_arr)

print(indexarr)

#to avoid use copy

indexarr_copy = indexarr.copy()

print(indexarr)

print(indexarr_copy)

indexarr_copy[:]=1

print(indexarr_copy)

print(indexarr)

arr_2d = np.array([[5,10,15], [20, 25, 30], [35, 40, 45]])

print(arr_2d)

print(arr_2d[1][1])

print(arr_2d[1,1])

#grabbing sub matrix from matrix

print(arr_2d[:2,1:])

print(arr_2d[:2,:2])

#boolean array using comparator operator

normal_arr = np.arange(1, 11)

print(normal_arr)

bool_arr = normal_arr > 3

print(bool_arr)

#grabbing from normal array from bool_arr

print(normal_arr[bool_arr])

print(normal_arr[normal_arr>4])

new_2d_array = np.arange(50).reshape(5,10)

print(new_2d_array)

print(new_2d_array[2:4,2:4]) #new_2d_array([from_row:to_row,from_col,to_col])

#numpy operation

print("numpy operation")

op_arr = np.arange(0,10)

print(op_arr + op_arr)

print(op_arr - op_arr)

print(op_arr * op_arr)

print(op_arr / 2)

print(op_arr / op_arr)