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# atand

2-quadrant and 4-quadrant element-wise inverse tangent, result in degree

### Calling Sequence

```phi = atand(x)
phi = atand(y, x)```

### Arguments

x

a real scalar, vector or matrix.

phi

a real scalar, vector or matrix.

x, y

real scalars, vectors or matrices of the same size.

phi

a 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)```