how to write a numpy array to a file in python
numpy.savetxt(fname, X, fmt='%.18e', delimiter=' ', newline='n',
header='', footer='', comments='# ', encoding=None)
x = y = z = np.arange(0.0,5.0,1.0)
np.savetxt('test.out', x, delimiter=',') # X is an array
np.savetxt('test.out', (x,y,z)) # x,y,z equal sized 1D arrays
np.savetxt('test.out', x, fmt='%1.4e') # use exponential notationarray storing in file by python
# long arrays can be stored in csv files far more efficiently
import numpy as np
import csv
# uploading arrays in a csv file
arr1 = [i for i in range(500)]
arr2 = [i for i in range(1000)]
arr3 = [i for i in range(2000)]
# you can write('w') or append('a')
with open('record.csv', 'a') as record_append:
np.savetxt(record_append, np.asarray([arr1]), delimiter=',')
np.savetxt(record_append, np.asarray([arr2]), delimiter=',')
np.savetxt(record_append, np.asarray([arr3]), delimiter=',')
# downloading them from the csv file
two_dim_arr = [] # each line of the file is an array element
with open('record.csv', 'r') as record_read:
reader = csv.reader(record_read)
for i, each_arr in enumerate(reader):
two_dim_arr.append([eval(each) for each in each_arr])
# printing the arrays in lines
for each_line in two_dim_arr:
print(each_line)Copyright © 2021 Codeinu
Forgot your account's password or having trouble logging into your Account? Don't worry, we'll help you to get back your account. Enter your email address and we'll send you a recovery link to reset your password. If you are experiencing problems resetting your password contact us
