log(x), x REAL or a structure with REAL components |

log(x) returns the natural logarithm (base e log) of the elements of x, when x is a REAL scalar, vector, matrix or array. The result has the same shape as x. If any element of x is MISSING, so is the corresponding element of log(x). If any element of x <= 0, the corresonding element of log(x) is MISSING. In both cases a warning message is printed. When x is a structure, all of whose non-structure components are REAL, log(x) is a structure of the same shape and with the same component names as x, with each non-structure component transformed by log(). See topic 'transformations' for more information on log().

Gary Oehlert 2003-01-15