この関数は Google スプレッドシートでも Excel と同じように機能します。構文も引数も同じです。
LOG(number, [base])The LOG function calculates the logarithm of a positive number based on a provided base. If the base argument is omitted, Excel defaults to a base of 10.
=LOG(100, 10)結果: 2
Calculates the base-10 logarithm of 100, which is 2.
=LOG(8, 2)結果: 3
Calculates the base-2 logarithm of 8, which is 3.
The function will return a #NUM! error because logarithms are only defined for positive numbers.