Numpy recarray.tobytes () function | python



Record arrays allow you to access fields as elements of an array using arr.a and arr.b numpy.recarray.tobytes () Python bytes, containing the raw data bytes in an array.

Syntax: numpy.recarray.tobytes (order = `C`)

Parameters:
order: [`C`, `F`, None, optional] Order of the data for multidimensional arrays: C , Fortran, or the same as for the original array.

Return: [bytes] Python bytes exhibiting a copy of record array`s raw data.

Code # 1:

# Python program explaining
# numpy.recarray.tobytes () method

  
# import numy like g ike

import numpy as geek

 
# create an input array with two different fields

in_arr = geek.array ([[( 5.0 , 2 ), ( 3.0 , - 4 ), ( 6.0 , 9 )],

[( 9.0 , 1 ), ( 5.0 , 4 ), ( - 12.0 , - 7 )]],

dtype = [( ` a` , float ), ( `b` , int )])

 

print ( "Input array:" , in_arr )

 
# convert it to array of posts,
# using arr.view (np.recarray)

 

rec_arr = in_arr.view (geek.recarray)

print ( "Record array of float:" , rec_arr.a)

print ( "Record array of int:" , rec_arr.b)

 
# using recarray.tobytes methods
# arrange array of posts in default order

out_arr = rec_arr.a.tobytes ( )

print ( "Output Python bytes of float record array in default order " , out_arr) 

print ()

 
# using recarray.tobytes methods
# output an array of records in fortan order

out_arr = rec_arr.a.tobytes (order = `F` )

print ( "Output Python bytes of float record array in fortan order" , out_arr) 

print ()

 
# applying recarray.tobytes methods
# into an array of int entries in default order

out_arr =   rec_arr.b.tobytes ()

print ( "Output Python bytes of int record array in default order" , out_arr) 

print ()

 
# applying recarray.tobytes methods
# into an array of int records in fortan order

out_arr = rec_arr.b.tobytes (order = `F` )

print ( "Output Python bytes of int record array in fortan order" , out_arr) 

Exit:

I nput array: [[(5., 2) (3., -4) (6., 9)]
[(9., 1) (5., 4) (-12., -7) ]]
Record array of float: [[5. 3. 6.]
[9. 5. -12.]]
Record array of int: [[2 -4 9]
[1 4 -7]]
Output Python bytes of float record array in default order b`x00x00x00x00x00x00x14 @ x00x00x00x00x00x00x08 @ x00x00x00x00x00x00x18 @ x00x00x00x00x00x00 ″ @ x00x00x00x00 python bytes of float record array in fortan order b`x00x00x00x00x00x00x14 @ x00x00x00x00x00x00 "@ x00x00x00x00x00x00x08 @ x00x00x00x00x00x00x14 @ x00x00x00x00x00x00x18 @ x00x00x00x00x00x00 (xc0 `

Output python bytes of int record array in default order b`x02x00x00x00xfcxffxffxff x00x00x00x01x00x00x00x04x00x00x00xf9xffxffxff`

Output Python bytes of int record array in fortan order b`x02x00x00x00x01x00x00x00xfcxffxffxffx04x00x00x00 x00x00x00xf9xffxffxff `

Code # 2: We

apply numpy.recarray.tobytes () to the entire array of records. < / p>

# Python program explaining
# numpy.recarray.tobytes () method

 
# import numy as a geek

import numpy as geek

 
# create an input array with two different fields

in_arr = geek.array ([[( 5.0 , 2 ), ( 3.0 , 4 ), ( 6.0 , - 7 )],

[( 9.0 , 1 ), ( 6.0 , 4 ), ( - 2.0 , - 7 )]],

dtype = [( `a` , float ), ( `b` , int )])

 

print ( "Input array:" , in_arr)

 
# convert it to an array of posts,
# using arr.view (np.recarray)

rec_arr = in_arr.view (geek.recarray)

  
# applying recarray.tobytes methods to
# writing array in default order

out_arr = rec_arr.tobytes ()

print ( "Output Python bytes of record array in default order" , out_arr) 

 print ()

 
# applying recarray.tobytes methods to
# array of records in fortan order

out_arr = rec_arr.tobytes (order = `F` )

print ( " Output Python bytes of record array in fortan order " , out_arr) 

Output:

Input array: [[(5. , 2) (3., 4) (6., -7)]
[(9., 1) (6., 4) (-2., -7)]]
Output Python bytes of record array in default order b`x00x00x00x00x00x00x14 @ x02x00x00x00x00x00x00x00x00x00x08 @ x04x00x00x00x00x00x00x00x00x00x18 @ xf9xffxffxffx00x00x00x00x00x00 ″ x00x00x00x18 @ x04x00x00x00x00x00x00x00x00x00x00xc0xf9xffxffxff `

Output Python bytes of record array in fortan order b`x00x00x00x00x00x00x14 @ x02x00x00x00x00x00x00x00x00x00 "@ x01x00x00x00x00x00x00x00x00x00x08 @ x04x00x00x00x00x00x00x00x00x00x18 @ x04x00x00x00x00x00x00x00x00x00x18 @ xf9xffxffxffx00x00x00x00x00x00x00xc0xf9xffxffxff`