`secd`

Secant of an angle in degrees.

Category: Mathematics > Elementary Math

Syntax

Y = secd(X)

Returns the secant of each element of X, with X in degrees.

Description

secd(x) is 1./cosd(x). Since cosd is exact at multiples of 90 degrees, secd gives exact values there, unlike sec(x*pi/180), which carries the rounding error of the conversion. For instance, secd(60) is exactly 2.

Input arguments

X: Angles in degrees.

Output arguments

Y: Array of the same size as X. Odd multiples of 90 give Inf.

Example

Degrees directly

secd([0 45 60])
secd(90)

Output

ans = 1×3

    1.0000    1.4142    2.0000
ans = Inf

See also

sec cosd sind tand