Data Analytics
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Dive into the world of Data Analytics – uncover insights, explore trends, and master data-driven decision making.

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Basics of NumPy: a powerful array instead of lists

NumPy is a fundamental library for scientific computing in Python. Its core is the ndarray (N-dimensional array), which works much faster than ordinary lists.

Briefly about the essence:
NumPy arrays store data of one type in a continuous block of memory. This allows operations to be performed on entire arrays without loops (vectorization), which gives a huge speed boost.

Where it's really useful:
πŸ”΅ Mathematical and statistical calculations
πŸ”΅ Processing large amounts of data
πŸ”΅ Machine learning and computer vision
πŸ”΅ Scientific modeling and engineering


An important nuance:
import numpy as np
arr = np.array([1, 2, 3])  # Creating an array
arr * 2  # Vectorization: [2, 4, 6]
list = [1, 2, 3]
list * 2  # Repetition: [1, 2, 3, 1, 2, 3]


Example in Python:
# Fast operations on the entire array
import numpy as np

# Creating an array
data = np.array([1, 4, 9, 16, 25])

# Vectorized operations
sqrt_data = np.sqrt(data) # Square root of each element
mean_value = np.mean(data) # Average value
filtered = data[data > 10] # Filtering (boolean indexing)

print(sqrt_data) # [1. 2. 3. 4. 5.]
print(mean_value) # 11.0
print(filtered)   # [16 25]


⚑️Comparison of approaches:
🟒 NumPy array vs Python list:
🟒 NumPy - operations on the entire array at once (vectorization)
🟒 List - cycles are required for element-by-element operations
绿色 NumPy - efficient storage in memory
绿色 List - stores references to objects
绿色 NumPy - built-in mathematics (linear algebra, statistics)
绿色 List - basic functionality

When to use:
πŸ”΄ Working with numerical data
πŸ”΄ High performance is required
πŸ”΄ Mathematics is needed: matrices, statistics, algebra
πŸ”΄ Processing images or audio
πŸ”΄ Integration with ML libraries (SciPy, Pandas, TensorFlow)


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This repository collects everything you need to use AI and LLM in your projects.

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