Logarithm Base X

Computes the logarithm of y to the base x. (x>0, y>0). If y is 0, the output is –. When x and y are both non-complex and x is less than or equal to 0, or y is less than 0, the output is NaN. The connector pane displays the default data types for this polymorphic function.

y can be a scalar number, array or cluster of numbers, array of clusters of numbers, and so on.
x can be a scalar number, array or cluster of numbers, array of clusters of numbers, and so on.
logx(y) is the logarithm of y to the base x.