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Copyright (C) 2000-2012 Philippe Troin <webmaster@fifi.org>.
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LOG(x[,base])
LOG computes the logarithm of @x in the given base @base. If no @base is given LOG returns the logarithm in base 10. @base must be > 0. and can not equal 1.
This function is Excel compatible.
LOG(2) equals 0.30103.
LOG(8192,2) equals 13.
LN, LOG2, LOG10.