Python Block with Vectors: Difference between revisions

From GNU Radio
Jump to navigation Jump to search
Line 25: Line 25:
** Value: 16
** Value: 16
* Stream to Vector, Num Items: vectorLength
* Stream to Vector, Num Items: vectorLength
*
* Vector to Stream, Num Items: vectorLength

Revision as of 13:59, 31 January 2022

Template:TutorialNavigation

This tutorial describes how the Python Embedded Block can be modified to accept vector inputs and outputs, and how the input_items vector indexing is different between vectors and streams.

The previous tutorial, Creating Your First Block, demonstrates how to create a Python block using the Embedded Python Block. The next tutorial, Python Block Message Passing describes how to send and receive messages using the Embedded Python Block.

Building the flowgraph

This tutorial uses vectors, please complete the Streams and Vectors tutorial before moving on.

Add the following blocks to the flowgraph:

  • Signal Source
  • Throttle
  • Stream to Vector
  • Embedded Python Block
  • Vector to Stream
  • QT GUI Time Sink (two copies)
  • Variable

Modify the following block properties:

  • Signal Source, Frequency: 100
  • QT GUI Time Sink (both copies), Autoscale: Yes
  • Variable
    • Id: vectorLength
    • Value: 16
  • Stream to Vector, Num Items: vectorLength
  • Vector to Stream, Num Items: vectorLength