MATLAB Function Reference

atan

Inverse tangent

Syntax

• Y = atan(X)
  

Description

Y = atan(X) returns the inverse tangent (arctangent) for each element of X. For real elements of X, atan(X) is in the range .

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

Examples

Graph the inverse tangent function over the domain .

• x = -20:0.01:20; 
  plot(x,atan(x)), grid on
  
  
  

Definition

The inverse tangent can be defined as

Algorithm

atan 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

atan2, tan, atanh

assignin

atan2