Home > Support > NI Product Manuals > LabVIEW Communications System Design Suite 1.0 Manual

Computes the base e natural logarithm of a specified input value.

If x is 0, ln is - . If x is not complex and is less than 0, ln is not a number (NaN).

connector_pane_image
datatype_icon

x

An input for this operation. x must be in the range [1/e, 1) and unsigned. The integer word length must be 0 bits.

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

datatype_icon

input valid

A Boolean that specifies 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 data point is valid and can be processed.
FALSE The data point is not valid.
datatype_icon

ready for output

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.
Note  

If this terminal is FALSE during a given cycle, the output valid terminal returns FALSE during that cycle.

Default: TRUE

datatype_icon

ln(x)

Natural logarithm of x. If x is outside the range [1/e, 1), ln(x) is undefined.

datatype_icon

undefined

A Boolean that indicates whether ln(x) is undefined.

TRUE ln(x) is undefined.
FALSE ln(x) is not undefined.
datatype_icon

output valid

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 The node has not computed a result that downstream nodes can use.
datatype_icon

ready for input

A Boolean that indicates whether this node is ready to accept new input data. Use a Feedback Node to wire this output to the ready for output input of an upstream node.

TRUE The node is ready to accept new input data.
FALSE The node is not ready to accept new input data.
Note  

If this terminal returns FALSE during a given cycle, LabVIEW discards any data that other nodes send to this node during the following cycle. LabVIEW discards this data even if the input valid terminal is TRUE during the following cycle.