how to create a prefilled array of float32 in python?

Question

if I do:

import numpy as np

arr1=np.tile(0.75, 32)

I get a 32 element array of float64 initialized with the value 0.75.

How to do the same but get a float32 array?

You can use `np.full`, `np.full(32, 0.75, dtype=np.float32)` — Sayandip Dutta, Sep 13 '21 at 13:05
I was about to suggest `np.ones(32, dtype=np.float32)*0.75` that is faster than `np.tile`, and `np.full` is even faster — mozway, Sep 13 '21 at 13:07
Out of curiosity, I've just tried out some ugly benchmark (aka `%timeit`). `tile` + casting : 6.55µs, `ones` with dtype : 3.44µs, `full` 2.13µs :) — NiziL, Sep 13 '21 at 13:13
ok.. then my problem is not this one... I am writing a WAV file using "soundfile". if I do f.write(float value) in a loop, it works. if I pass to it a float32 array it does not. damn. — Zibri, Sep 13 '21 at 13:16

Zibri · Answer 1 · 2021-09-13T23:11:29.200

0

All suggestion work but my program clearly was not related to this but to the soundfile library. Anyway:

Solutions are:

np.tile(0.75, 32).astype(np.float32)

or

np.full(32, 0.75, dtype=np.float32)    # **FASTEST**

or

np.ones(32)*0.75

edited Sep 13 '21 at 23:11

answered Sep 13 '21 at 13:19

Zibri

1 Answers1