Noisex.Utils.write_to_file

You're seeing just the function write_to_file, go back to Noisex.Utils module for more information.
Link to this function

write_to_file(noisemap, filename)

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Specs

write_to_file(Noisex.Noise.noisemap(), String.t()) ::
  {:ok, :wrote} | {:error, String.t()}

Writes the given noise map to a file. filename requires an extension (.png is recommended).