NumPy - Creating Arrays
You want to create a 2D array with 3 rows and 4 columns filled with random floats between 0 and 1, then multiply all values by 10 to scale them. Which code correctly does this?
You want to create a 2D array with 3 rows and 4 columns filled with random floats between 0 and 1, then multiply all values by 10 to scale them. Which code correctly does this?
hard📝 Application Q15 of 15
Step-by-Step Solution
Solution:
Step 1: Create a 3x4 array of random floats
Use np.random.rand(3, 4) to get a 2D array with 3 rows and 4 columns.Step 2: Scale all values by 10
Multiply the entire array by 10 to scale values from [0,1) to [0,10).Final Answer:
arr = np.random.rand(3, 4) * 10 -> Option BQuick Check:
Shape and scaling done correctly [OK]
Quick Trick: Multiply after rand() to scale values, keep shape in arguments [OK]
Common Mistakes:
- Adding 10 instead of multiplying
- Using wrong shape arguments
- Creating 1D array instead of 2D
Master "Creating Arrays" in NumPy
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