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# Debugging
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## Contents
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1. [File Sink and Source](#file-sink-and-source)
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## File Sink and Source
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GNU Radio flowgraphs are real-time signal processing applications that typically
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operate on continuous streams of data. This can make it difficult to investigate
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signal characteristics or debug unexpected behaviour. The GNU Radio *File Sink*
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and *File Source* blocks are a handy way to allow offline investigation of the
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signal at various points in your flowgraph using Python scientific libraries or
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MATLAB.
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<div align="center">
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</div>
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When included in your flowgraph, the *File Sink* block will save data samples
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to a binary file that can then be loaded as an array in Python or MATLAB.
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Similarly, a known test waveform can be generated in Python or MATLAB and then
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fed into your flowgraph using the *File Source* block. The combination of sink
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and source can also be used to save a waveform for latter playback.
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See the following GNU Radio documentation pages to understand these blocks and
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how to binary waveforms files can be loaded/created in MATLAB and Python.
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- [GNU Radio File Sink](https://wiki.gnuradio.org/index.php/File_Sink)
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- [GNU Radio File Source](https://wiki.gnuradio.org/index.php/File_Source) |
