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43 lines
1.3 KiB
ReStructuredText
43 lines
1.3 KiB
ReStructuredText
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.. _hdf5_tut_ex3:
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Example 3 : Use the dictionary interface of the archive
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--------------------------------------------------------------------
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The archive is like a dictionary, persistent on disk.
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`[for Python afficionados, it is similar to a shelve, but in a portable format]`.
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Therefore, one can iterate on its elements.
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Let us imagine that you have stored 5 Green functions in an hdf5 file.
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For example, we can create such a file as :download:`[file] <./tut_ex3.py>`:
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.. literalinclude:: tut_ex3.py
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Imagine that we want to plot those functions :download:`[file] <./tut_ex3b.py>`:
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.. literalinclude:: tut_ex3b.py
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:lines: 1-13
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This produces the following plot (scaled semi-circular density of states).
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.. image:: tut_ex3b.png
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:width: 750
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:align: center
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Various pythonic constructs can be used in combinaison with HDFArchive, e.g.
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in order to plot only a few curves from a list ::
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keylist = ['D=1', 'D=3']
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for g in ( R[x] for x in keylist) : # use an iterator
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oplot( (- 1/pi * g).imag, "-o", name = 'g' )
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or if we want to add the names ::
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for n,g in ( (x,R[x]) for x in keylist) : # use an iterator
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oplot( (- 1/pi * g).imag, "-o", name = n )
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The advantage of using an iterator is that the object is only retrieved from disk when needed.
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