Problem 47. Extract leading non-zero digit

Benford's Law states that the distribution of leading digits is not random. This is probably because many things grow logarithmically. Extract the leading digit from these vectors.

  • 10 --> 1
  • 13 --> 1
  • 0.3 --> 3
  • -4 --> 4
  • -5 --> 5
  • -0.006 --> 6

Input will be a vector

 x = [1 0.3 -2 0.001 -0.0006, 582398, 3020];

Output should be

 y = [1 3 2 1 6 5 3];
Solve

Solution Stats

57.39% Correct | 42.61% Incorrect
Last Solution submitted on Dec 14, 2025

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