Python numpy library log method returning wrong value

Question

Python numpy library log method returning wrong value so please help me.

import numpy as np
print('Log :',np.log(0.25))

numpy log method returns -1.38629436112

Excel log function =LOG(0.25) returns -0.602059991327962 Then I Calculated manually using calculator it returns -0.602059991327962.

It is returning the base e log rather than the base 10 one.

James
– James

2017-09-25 13:12:04 +00:00
Commented Sep 25, 2017 at 13:12 — James
– James, Commented Sep 25, 2017 at 13:12
You are confused with log_2, log_e and log_10

Reblochon Masque
– Reblochon Masque

2017-09-25 13:12:13 +00:00
Commented Sep 25, 2017 at 13:12 — Reblochon Masque
– Reblochon Masque, Commented Sep 25, 2017 at 13:12

Ignacio Vergara Kausel · Accepted Answer · 2017-09-25 13:12:08Z

5

Because the log function is in base e while your calculator and excel are base 10 by default. Use np.log10(0.25) and you'll get the value you want.

answered Sep 25, 2017 at 13:12

Ignacio Vergara Kausel

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