MATLAB Function Reference |
Secant of an argument in radians
Syntax
Description
The sec
function operates element-wise on arrays. The function's domains and ranges include complex values. All angles are in radians.
Y = sec(X)
returns an array the same size as X
containing the secant of the elements of X
.
Examples
Graph the secant over the domains and .
x1 = -pi/2+0.01:0.01:pi/2-0.01; x2 = pi/2+0.01:0.01:(3*pi/2)-0.01; plot(x1,sec(x1),x2,sec(x2)), grid on
The expression sec(pi/2)
does not evaluate as infinite but as the reciprocal of the floating-point accuracy eps
, because pi
is a floating-point approximation to the exact value of .
Definition
Algorithm
sec
uses FDLIBM, which was developed at SunSoft, a Sun Microsystems, Inc. business, by Kwok C. Ng, and others. For information about FDLIBM, see http://www.netlib.org.
See Also
asec
, asech
, eps
, pi
, secd
, sech
script | secd |
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