logb

Calculate the log of a number/matrix using a user-specified base.

FUNCTION Y = LOGB(X,B)
logb: Calculates the logarithm of x to user-specified base b.

USAGE: y = logb(x,b)

(A trivial but useful function for arbitrary-base log calculations.)

Arguments:
Y: the base 'b' logarithm of input x
B: The base of the logarithmic calculation (default, e). Note that if B is non-scalar, it must be the same size as X. In that case, the log transformation will be element-by-element.

Examples:
1) To calculate the base 5 logarithm of 3:
y = logb(3,5)

2) To calculate element-wise the log of a non-scalar input using different bases:
y = logb(magic(3),[1 2 3; 4 5 6; 7 8 9]);

See also: log, log10, log2