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The Logarithm action calculates the exponent to which a base must be raised to produce the input number. Leave Base empty for the natural logarithm.

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Inputs

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Outputs

For example, Number 1000 with Base 10 returns approximately 3.
Although zero is accepted, its logarithm is negative infinity. Bases 1, 0, and negative values can produce infinity or NaN; use a positive base other than 1 for ordinary real-number logarithms.