Description: |
Produces the arctangent of X. | ||

Class: |
Elemental function; Generic | ||

Arguments: | X must be of type real. | ||

Results: |
The result type is the same as X and is expressed in radians. The value lies in the range -pi/2 to pi/2. |

Specific Name | Argument Type | Result Type |
---|---|---|

ATAN | REAL(4) | REAL(4) |

DATAN | REAL(8) | REAL(8) |

QATAN | REAL(16) | REAL(16) |

**Examples**

ATAN (1.5874993) has the value 1.008666.

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