| MATLAB Function Reference | ![]() |
Y = atan(X)
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.
Graph the inverse tangent function over the domain
.
x = -20:0.01:20; plot(x,atan(x)), grid on

The inverse tangent can be defined as
![]()
atan uses FDLIBM, which was developed at SunSoft, a Sun Microsystems™ business, by Kwok C. Ng, and others. For information about FDLIBM, see http://www.netlib.org.
![]() | assignin | atan2 | ![]() |
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