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Connect the sink at input index to the source at output index. Samples from other input ports are consumed and dumped. Other output ports produce no samples.

output[output_index][i] = input[input_index][i]


(R): Run-time adjustable

Enabled (R)
Whether or not input gets copied to output.
NOTE: Selector block prior to GR 3.8 does not have Enabled parameter
Number of Inputs
Number of input streams
Number of Outputs
Number of output streams
Input Index (R)
Used to choose which input stream gets used. It is typical for this to be changed in realtime using e.g. a QT GUI Chooser
Output Index (R)
Used to choose which output stream gets the input copied to it. It is typical for this to be changed in realtime using e.g. a QT GUI Chooser

Example Flowgraph

This example flowgraph is located in the GNU Radio examples under src/gnuradio/gr-blocks/examples/selector.grc

Selector example flowgraph.png

In this example, there are three input signals, which can be directed by the parameters of the selector block to one of two of the output ports. In the case where the input is set to 0 and the output is set to 0, we get the cosine signal passing from input 0 to Output 0. In this case Output 1 produces no samples.

Selector output 1.png

If we change the output index to 1, and the input index to 1, we see the triangle wave produced at output 1. Output 0 in this case is producing no output samples, but the QT GUI Time sink does not update the display.

Selector output 2.png

Source Files

C++ files
Header files
Public header files
Block definition