ML For Beginners

12 weeks, 26 lessons, 52 quizzes, classic Machine Learning for all

Creator: microsoft
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https://github.com/microsoft/ML-For-Beginners

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Why does an Array index start with 0?

- An array is a data structure that stores elements of the same type in contiguous memory blocks.

-Each block in an array has the same size. For example, an integer (int) typically takes 4 bytes in memory.

- For an int array of size 3, the total memory allocated would be 4×3=12 bytes. I.e., size of an int is 4.

- If the starting memory address of the array is 10, the blocks will be at addresses: 10, 14, and 18.

- Arrays enable fast element retrieval using an index.

- The formula to calculate the memory address of an element is: Memory Address= Base Address + (Index ×Size of Each Element)

- For an array starting at address 10, to find the element at index 2: Memory Address=10+(2×4)=18

- If arrays started at index 1 instead of 0, the last index would require an adjustment in the formula.

- For example, for index 3: Memory Address=10+((3−1)×4)=18

- This extra subtraction step increases computation. Starting at index 0 simplifies calculations, saving an operation.

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