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Section: Mathematical Functions
Computes the cos
function for its argument. The general syntax for its use is
y = cos(x)
where x
is an n
-dimensional array of numerical type. Integer types are promoted to the double
type prior to calculation of the cos
function. Output y
is of the same size and type as the input x
, (unless x
is an integer, in which case y
is a double
type).
Mathematically, the cos
function is defined for all real valued arguments x
by the infinite summation
For complex valued arguments z
, the cosine is computed via
The following piece of code plots the real-valued cos(2 pi x)
function over one period of [0,1]
:
--> x = linspace(0,1); --> plot(x,cos(2*pi*x))