cosd element-wise cosine function, argument in degree

## Syntax

    y = cosd(x)

## Arguments

x

  a real vector/matrix.

## Description

For a vector or a matrix `x` of angles given in degree, `cosd(x)` is the cosine of its elements. The results are in `[-1 1]`. For input elements which are equal to `n*90` with `n` integer and odd, the result is exactly zero.

## Sample

x=-360:1:360 plot(x,cosd(x))

## Examples

    cosd([0 30 45 60 90 360])
    1 ./ cosd([-90 90])

    --> cosd([0 30 45 60 90 360])
     ans  =
       1.   0.8660254   0.7071068   0.5   0.   1.

    --> 1 ./ cosd([-90 90])
     ans  =
       Inf   Inf

## See also

- acosd
- cos
- acos
- cosh
- acosh