Last Modified: September 10, 2016

Computes the arctangent of one value divided by another value (**y**/**x**). The arctangent is in pi radians, which use fewer FPGA resources than radians. To convert this value into radians, divide the result by pi.

This input supports only scalar values of the fixed-point data type.

x and y Coercion

If you wire fixed-point data types with different configurations to the inputs, this node uses a shared, signed fixed-point data type to represent the value of both inputs internally. The maximum word length of this internal data type is 64 bits. If the configurations of the inputs result in an internal word length greater than 64 bits, this node rounds off the fractional bits of one input to achieve an internal word length of 64 bits, resulting in a loss of precision. This node rounds off the input that has the most fractional bits.

An input to this operation

This input supports only scalar values of the fixed-point data type.

x and y Coercion

A Boolean that describes whether the next data point has arrived for processing. Wire the **output valid** output of an upstream node to this input to transfer data from the upstream node to this node.

TRUE | The next data point has arrived for processing. |

FALSE | The next data point has not arrived for processing. |

A Boolean that specifies whether downstream nodes are ready for this node to return a new value. Use a Feedback Node to wire the **ready for input** output of a downstream node to this input of the current node.

True | The downstream node is ready for the next data point. |

False | The downstream node is not ready for the next data point. |

**Default: **TRUE

Arctangent of **y**/**x** in pi radians, which use fewer FPGA resources than radians. To convert this value into radians, divide **atan2(y,x)** by pi.

A Boolean that indicates whether this node has computed a result that downstream nodes can use. Wire this output to the **input valid** input of a downstream node to transfer data from the node to the downstream node.

True | The node has computed a result that downstream nodes can use. |

False | This node has not computed a result that downstream nodes can use. Any data output returns an undefined value. The undefined value returned by a data output may differ between simulation and hardware. |

If you wire a fixed-point data type to only **x** or **y**, this node coerces the unwired input to match the configuration of the wired terminal.

**Where This Node Can Run: **

Desktop OS: none

FPGA: All devices