atand

Arguments

x

real scalar, vector or matrix

phi

real scalar, vector or matrix

x, y

real scalars, vectors or matrices of the same size

phi

real scalar, vector or matrix

Description

The first form computes the 2-quadrant inverse tangent, which is the inverse of tand(phi). The phi elements are in the interval [-90, 90].

The second form computes the 4-quadrant arctangent (atan2 in Fortran), this is, it returns the argument (angle) of the complex number x+i*y. The range of atand(y,x) is [-180,180i].

Both forms yield identical values if x>0.

Examples

// example with the second form
x=[0,1/sqrt(3),1,sqrt(3),%inf,0]
atand(x)

See Also

• tan — tangent
• tand — set floating point exception mode

Authors

• Serge Steer, INRIA