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Last change
on this file since 7092 was
2552,
checked in by jack, 18 years ago
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Convenience functions for common norms.
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File size:
448 bytes
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| 1 | """Definitions of common norm functions, for consistency checks. |
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| 2 | """ |
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| 3 | |
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| 4 | from math import fabs,sqrt |
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| 5 | |
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| 6 | def l1_norm(vector): |
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| 7 | """L_1 norm of a vector""" |
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| 8 | return reduce(lambda p,q : p + q, map(fabs, vector), 0.0) |
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| 9 | |
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| 10 | def l2_norm(vector): |
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| 11 | """L_2 norm of a vector""" |
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| 12 | return sqrt(reduce(lambda p,q : p + q, map(lambda x : x ** 2, vector), 0.0)) |
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| 13 | |
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| 14 | def linf_norm(vector): |
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| 15 | """L_\infty norm of a vector""" |
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| 16 | return max(map(fabs, vector + [0.0])) |
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