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Today, I would like to share with you the relevant knowledge about how to achieve string conversion array in perl. The content is detailed and the logic is clear. I believe most people still know too much about this, so share this article for your reference. I hope you can get something after reading this article. Let's take a look at it.

Question: if there is a string of numbers of type str, how to quickly convert it to an array?

I give four methods here and give a simple performance comparison.

Method 1:

% timeitl = [] for i in '123456789123456789123456789: l.append (int (I)) np.array (l)

Results: 11.2 μ s ±114 ns per loop (mean ±std. Dev. Of 7 runs, 100000 loops each)

Method 2:

% timeitnp.array ([i for i in '123456789123456789123456789'], dtype='int8')

Results: 7.12 μ s ±50.4 ns per loop (mean ±std. Dev. Of 7 runs, 100000 loops each)

Method 3:

% timeitnp.array (list ('123456789123456789123456789'), dtype='int8')

Results: 6.52 μ s ±52 ns per loop (mean ±std. Dev. Of 7 runs, 100000 loops each)

Method 4:

% timeitnp.fromiter ('123456789123456789123456789,' int8')

Results: 4.07 μ s ±33.2ns per loop (mean ±std. Dev. Of 7 runs, 100000 loops each)

The performance of method 1 has been improved from method 1 to method 4, and the performance improvement of method 4 is still very significant. The result of a little performance improvement in front of a large number of calculations may be the difference between a few minutes and hours or even days.

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