How to export a multidimensional NumPy array to a CSV file?

Dumping a NumPy Array into a CSV File

Exporting multidimensional NumPy arrays to CSV files is a common requirement for data manipulation and analysis. This question explores the use of NumPy's savetxt function to achieve this task.

Solution

NumPy provides the savetxt function, which offers a convenient method for writing arrays to a text file in the comma-separated values (CSV) format.

import numpy

# Create a 2D NumPy array
a = numpy.asarray([ [1,2,3], [4,5,6], [7,8,9] ])

# Save array to CSV file
numpy.savetxt("foo.csv", a, delimiter=",")

Explanation

• The savetxt function takes two main arguments: the filename and the array to save.
• The delimiter, which separates individual array elements in the output CSV file, can be specified. In this case, a comma is used.
• The resulting "foo.csv" file will contain the array data in a human-readable format suitable for import into other software packages or analysis tools.

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