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Create: 2025-01-08 Update: 2025-06-30 04:21:53

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✅کار با متدهای numpy - بخش اول

⏪برای محاسبه سایز یک آرایه کافیه از متد shape استفاده کنیم،آرایه دو بعدی که در تایپک قبلی ارسال کردم در نظر بگیرید، برای محاسبه سایز از دستور زیر استفاده میکنیم:

»> a2.shape
(2, 4)

نکته : توجه کنید در صورتیکه تعداد سطرها یک باشد این دستور بصورت پیش فرض مقداری برای سطر در نظر نخواهد گرفت و فقط تعداد ستون رو بعنوان خروجی نمایش خواهد داد.

»> a3.shape
(4,)

⏪برای نمایش المان های یک آرایه از متد dtype استفاده میشه،در واقع نوع عناصر آرایه رو نمایش خواهد داد:

»> a2.dtype
dtype('int32')
»> a6 = np.array([[1.1,2.1,3.2],[2.2,2.2,3.5]])
»> a6.dtype
dtype('float64')

نکته: توجه کنید اگر داخل آرایه چندتا عدد صحیح و چندتا اعشاری داشته باشیم پایتون اون آرایه رو بصورت اعشار میبینه و اولویت با اعشار می باشه

⏪متدitemsize اندازه تعداد بایت ها رو برمیگردونه بعنوان مثال ما در a2 مقدار int32 داریم که 32 بیت هست و چون هر بایت هشت بیت هست پس مقدار 4 رو برمیگردونه و برای a6 هم مقدار 64/8 را برمیگردونه،مشاهده کنید:

»> a2.itemsize
4
»> a6.itemsize
8

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»> a2.shape
(2, 4)

»> a3.shape
(4,)

⏪برای نمایش المان های یک آرایه از متد dtype استفاده میشه،در واقع نوع عناصر آرایه رو نمایش خواهد داد:

»> a2.dtype
dtype('int32')
»> a6 = np.array([[1.1,2.1,3.2],[2.2,2.2,3.5]])
»> a6.dtype
dtype('float64')

»> a2.itemsize
4
»> a6.itemsize
8

🗂 مرکز آموزش پایتون
➖➖➖➖➖➖➖➖
@pythonchallenge

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675 viewsedited Jan 8 at 04:58

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