scipy tutorial - Baustatik-Info-Server

SciPy Reference Guide, Release 0.8.dev
Inputs:
file_name – The complete path name to the file to open
or an open file-like object
permission – Open the file with given permissions: (‘r’, ‘w’, ‘a’)
for reading, writing, or appending. This is the same as the mode argument in
the builtin open command.
format – The byte-ordering of the file:
([’native’, ‘n’], [’ieee-le’, ‘l’], [’ieee-be’, ‘B’]) for native, little-endian, or bigendian
respectively.
Attributes:
endian – default endian code for reading / writing order – default order for reading
writing (‘C’ or ‘F’) file – file object containing read / written data
Methods:
seek, tell, close – as for file objects rewind – set read position to beginning of file
read_raw – read string data from file (read method of file) write_raw – write string
data to file (write method of file) read_array – read numpy array from binary file
data write_array – write numpy array contents to binary file
Example use: >>> from StringIO import StringIO >>> import numpy as np >>> from
scipy.io import npfile >>> arr = np.arange(10).reshape(5,2) >>> # Make file-like object
(could also be file name) >>> my_file = StringIO() >>> npf = npfile(my_file)
>>> npf.write_array(arr) >>> npf.rewind() >>> npf.read_array((5,2), arr.dtype) >>>
npf.close() >>> # Or read write in Fortran order, Big endian >>> # and read back
in C, system endian >>> my_file = StringIO() >>> npf = npfile(my_file, order=’F’,
endian=’>’) >>> npf.write_array(arr) >>> npf.rewind() >>> npf.read_array((5,2),
arr.dtype)
3.6.4 Wav sound files (scipy.io.wavfile)
read(file) Return the sample rate (in samples/sec) and data from a WAV file
write(filename, rate, data) Write a numpy array as a WAV file
read(file)
Return the sample rate (in samples/sec) and data from a WAV file
The file can be an open file or a filename. The returned sample rate is a Python integer The data is returned as a
numpy array with a
data-type determined from the file.
write(filename, rate, data)
Write a numpy array as a WAV file
filename – The name of the file to write (will be over-written) rate – The sample rate (in samples/sec). data – A
1-d or 2-d numpy array of integer data-type.
The bits-per-sample will be determined by the data-type To write multiple-channels, use a 2-d array
of shape (Nsamples, Nchannels)
Writes a simple uncompressed WAV file.
214 Chapter 3. Reference