# NumPy Masked Arrays: Exercises and Solutions

## NumPy Masked Arrays [ 20 exercises with solution]

Following exercises will help you practice using masked arrays to handle missing or invalid data in NumPy, enhancing your data manipulation and analysis skills.

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1. Write a NumPy program that creates a masked array from a regular NumPy array with some specified values masked.
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2. Write a NumPy program that creates a masked array and fills the masked values with a specified number.
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3. Write a NumPy program to compute the mean of a masked array, ignoring the masked values.
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4. Write a NumPy program that creates a masked array where all elements greater than a specified value are masked.
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5. Write a NumPy program to replace all masked values in a masked array with the mean of the unmasked elements.
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6. Write a NumPy program to create a masked array and count the number of masked elements.
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8. Write a NumPy program to create a masked array from a 2D NumPy array and mask all values in a specified row.
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9. Write a NumPy program that creates a masked array and uses logical operations to mask elements based on a condition.
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10. Write a NumPy program to create a masked array and find the maximum value, ignoring the masked elements..
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11. Write a NumPy program to create a masked array and find the indices of all unmasked elements.
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12. Write a NumPy program to create a masked array and convert it back to a regular NumPy array, replacing the masked values with NaN.
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13. Write a NumPy program that creates a masked array and performs a masked operation, such as masked multiplication.
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14. Write a NumPy program that creates a masked array and applies a custom function only to the unmasked elements.
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15. Write a NumPy program that creates a masked array and extracts the unmasked data as a regular NumPy array.
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16. Write a NumPy program to create a masked array and perform a masked sum operation, ignoring the masked elements.
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17. Write a NumPy program that creates a masked array from a regular array and mask values based on a complex condition.
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18. Write a NumPy program that creates a masked array and changes the mask to include additional elements.
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19. Write a NumPy program that creates a masked array and applies a mathematical function (e.g., sin, cos) only to the unmasked elements.
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20. Write a NumPy program that creates a masked array and checks if any masked elements are present.
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