Section: Mathematical Functions
log
function for its argument. The general
syntax for its use is
y = log(x)
where x
is an n
-dimensional array of numerical type.
Integer types are promoted to the double
type prior to
calculation of the log
function. Output y
is of the
same size as the input x
. For strictly positive, real inputs,
the output type is the same as the input.
For negative and complex arguments, the output is complex.
log
function is defined for all real
valued arguments x
by the integral
For complex-valued arguments, z
, the complex logarithm is
defined as
where arg
is the complex argument of z
.
log
function over the interval [1,100]
:
--> x = linspace(1,100); --> plot(x,log(x)) --> xlabel('x'); --> ylabel('log(x)');