MATLAB Function Reference

cos

Cosine

Syntax

• Y = cos(X)
  

Description

The cos function operates element-wise on arrays. The function's domains and ranges include complex values. All angles are in radians.

Y = cos(X) returns the circular cosine for each element of X.

Examples

Graph the cosine function over the domain .

• x = -pi:0.01:pi; 
  plot(x,cos(x)), grid on
  
  
  

The expression cos(pi/2) is not exactly zero but a value the size of the floating-point accuracy, eps, because pi is only a floating-point approximation to the exact value of .

Definition

The cosine can be defined as

Algorithm

cos 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

acos, acosh, cosh

corrcoef

cosh