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log

The log function in XQuery returns the natural logarithm of the argument.

math:log(arg)

The following table describes the argument for this command:

Argument	Required/Optional	Description
arg	Required	The positive numeric value to compute the natural logarithm of.

Returns the natural logarithm (base ( e )) of the input value.

Returns an empty sequence if the input is an empty sequence.

Usually returns an error or empty if input is less than or equal to zero, since logarithm is undefined for those.

The following table lists some sample values and return values:

The function argument must be a positive numeric value.

Passing zero, negative numbers, or empty sequences will result in an error or empty sequence.

Returns a numeric value representing the natural logarithm.

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