LOG Function

LOG(real-expression)

Returns the natural logarithm (base e, approximately 2.71828) of the given expression.

The input must be strictly greater than 0.

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Examples

PRINT LOG(1)

Produces 0.

PRINT LOG(EXP(3))

Produces approximately 3.

REM Convert exponential growth back to linear scale
value# = 1000
PRINT "ln("; value#; ") = "; LOG(value#)

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Notes

• Domain: input must be > 0.
• Range: result may be any real number.
• Inverse of EXP: LOG(EXP(x)) = x.

• To compute logarithms in other bases:

  LOG10(x#) = LOG(x#) / LOG(10)

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See also: EXP · POW · SQR