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What will be the output of this code snippet when plotting 1 million points with matplotlib?

medium📝 Predict Output Q13 of 15
Matplotlib - Performance and Large Data
What will be the output of this code snippet when plotting 1 million points with matplotlib?
import matplotlib.pyplot as plt
import numpy as np
x = np.arange(1000000)
y = np.sin(x / 100000)
plt.plot(x, y)
plt.show()
AThe plot will display quickly with smooth lines
BThe plot will take a long time to render or freeze
CThe code will raise a syntax error
DThe plot will show only the first 1000 points
Step-by-Step Solution
Solution:
  1. Step 1: Analyze the data size and plotting method

    Plotting 1 million points with plt.plot draws many lines, which is slow and resource-heavy.
  2. Step 2: Predict the rendering behavior

    This large plot will take a long time or freeze because matplotlib tries to draw every point.
  3. Final Answer:

    The plot will take a long time to render or freeze -> Option B
  4. Quick Check:

    Large data with line plot = slow rendering = A [OK]
Quick Trick: Large line plots with millions of points are slow [OK]
Common Mistakes:
  • Assuming matplotlib automatically limits points
  • Expecting instant plot display
  • Thinking code has syntax errors

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