What is the best way to export an R array to a .npy file for later use in Numpy?

Toy data:

v1 <- c(1,2,3,4,5,6,7,8,9)
v2 = v1 1
v3 = v2 1
        
# Array to export = a
a <- array(c(v1,v2,v3), dim=c(3,3,3))
print(a)

CodePudding user response：

• We can use reticulate library and import numpy package as np , then we can save and load .npy files

library(reticulate)

np <- import("numpy")
a <- np$array(a)

np$save("my_array" , a)

np$load("my_array.npy")

• Output

, , 1

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

, , 2

     [,1] [,2] [,3]
[1,]    2    5    8
[2,]    3    6    9
[3,]    4    7   10

, , 3

     [,1] [,2] [,3]
[1,]    3    6    9
[2,]    4    7   10
[3,]    5    8   11

CodePudding user response：

Use reticulate package to accomplish this:

reticulate::r_to_py(a)$dump('filename.npy')

then go to python and do

import numpy as np

np.load('filename.npy', allow_pickle = True)