Ahkab

another step in the current time-based release scheme.

This release features support for the Fourier (.FOUR) and Fast Fourier Transform
directives (.FFT). Piece-wise linear functions are also now supported in Python,
with extra features like a repeat directory to enable periodicity.

Moreover, as in the previous releases, several commits were devoted to improving
the documentation: you can find the new, improved documentation online at
http://ahkab.readthedocs.org/en/latest/

Features added:

* FEATURES

* Add .FOUR and .FFT support
* Add PWL waveforms (available from python only)

Backwards incompatible changes:

* AC analyses are from now defined in Hz (compliant with SPICE). This also means
that there is no omega (accessed through 'w') in the results set, it is now
replaced by a frequency vector, expressed in Hz and accessed as 'f'.

User code can be usually easily fixed substituting ``2*pi*r[w]`` with ``r[f]``
or the like. Sorry for any trouble this creates.

Changes from contributors and pull requests merged:

*None.*

Bugs fixed, short list:

BUGFIX: Fix opening of files in system that do not default to utf-8
BUGFIX: Suppress error message on Windows
BUGFIX: Use all assumptions, fix 32
BUGFIX: fix reading the netlist from stdin
BUGFIX: Use different options for SH and BFPSS
BUGFIX: no DC value -> return t=0
BUGFIX: convert to uppercase before comparison

in the current time-based release scheme.

This release features a new memoization system, AM and FM time functions,
improved docs and error message. We also got rid of the last instances of
`np.mat` in the code.

Moreover, as in the previous releases, several commits were devoted to improving
the documentation: you can find the new, improved documentation online at
http://ahkab.readthedocs.org/en/latest/

Features added:

* FEATURES

* Implement a memoization system.
* Replace `mytime_function.value()` with `mytime_function(time)`.
* Add AM to the time functions.
* Add the SFFM time function.
* `find_vde_index()` now allows for `elem` and `part_id` args.
* `remove_elem()` now allows `elem` and `part_id` args.

Backwards incompatible changes:

* the time functions have been moved to their own module, named
`time_functions.py`. This means code referring to the `sin`, `pulse` and `exp`
functions needs to change from `devices.sin` to `time_functions.sin`.
* You now need to call `set_results()` to set `pss_solution` data.

Changes from contributors and pull requests merged:

*None.*

Bugs fixed, short list:

BUGFIX: plotting: remember to set the active figure.
BUGFIX: fix a bug in `circuit.remove_elem()`, add tests.
BUGFIX: fix a bug in `circuit.find_vde()`, add tests.
BUGFIX: fix error message in circuit.py.
BUGFIX: Do not ask for prediction if we don't have enough points.

in the current time-based release scheme.

Features added:

This release brings the test coverage of the codebase over the 80% milestone for
the first time. It also features a faster substitution algorithm for symbolic
simulations, we empoly the ``tabulate`` module more extensively, producing a
prettier output (for example ``print_short()`` now prints a pretty table.)

Internally, We removed occurrences of ``np.matrix``, in favor of ``np.array``,
according to the overall planned switch in the library. This should be
completely transparent to the user.

A few changes that have been introduced are *incompatible* with the previous
releases:

* The axis iterators ``utilities.log_axis_iterator`` and
``utilities.lin_axis_iterator`` now follow the syntax ``(min, max, points)``.
* The solution method ``solution.asmatrix()`` has been renamed to
``solution.asarray()``.
* We droppped the (undocumented) support for accessing singularities in
``pz_solution`` as ``'Re(p0)'`` and ``'Im(p0)'``. Hopefully, being
undocumented it had little use. Please use ``numpy.real(r['p0'])`` or
``numpy.imag(r['p0'])`` to achieve the same result.
* Remove ``printing.table_print()`` for ``print(printing.table())``.

We apologize about the above, we believe the technical debt we paid with the
changes above makes up for the discomfort to our userbase.

Moreover, as in the previous releases, several commits were devoted to improving
the documentation: you can find the new, improved documentation online at
http://ahkab.readthedocs.org/en/latest/

Issues fixed

* 29 - ``ahkab`` should now work well in IPython running under Python2 again.

Changes from contributors and pull requests merged:

*None.*

Bugs fixed, short list:

* BUGFIX: Always plot in tests even if the test fails (especially then!)
* BUGFIX: catch ``ValueError`` in ``results.cid``
* BUGFIX: fix ``pss_solution.asmatrix()``
* BUGFIX: import ``codecs`` even if on Ipython
* BUGFIX: fix iterator off-by-one in ``symbolic_solution``
* BUGFIX: key misses in ``symbolic_solution`` raise ``KeyErrors``
* BUGFIX: fix slicing in the solution (use it too)
* BUGFIX: ``dc_solution.values()`` now slices along the correct axis
* BUGFIX: ``load_csv()`` raises ``ValueError``
* BUGFIX: key misses raise ``KeyErrors``
* BUGFIX: prevent breaking readline on ipython, fixes 29
* BUGFIX: ensure w is always returned as real data, not cplx
* BUGFIX: Improve the iterators syntax, always include endpoints.
* BUGFIX: raise ``KeyError`` for key misses in ac_solution
* BUGFIX: ``items()`` returns no arrays.
* BUGFIX: ``values()`` returns a list, not an array.
* BUGFIX: fix iterator increment-by-one bug

Version 0.15 is just a bugfix release addressing the fact that the minimum version of the ``sympy`` release that is needed is 0.7.6.

Version 0.14 represents the culmination of three months of efforts, yet another step in the current time-based release scheme.

This release features much improved tabular print-outs, thanks to ``tabulate``, faster circuit checking and reverse node look-ups.

Moreover, as in the previous releases, many commits were devoted to improving the documentation: you can find the new, improved documentation online at http://ahkab.readthedocs.org/en/latest/

Features added:

* Use ``tabulate`` to print out pretty tables. *They are pretty, oh so pretty tables.*
* Add and use ``circuit.get_nodes_number()``.
* Change ``nodes_dict`` to speed up reverse lookups.
* Faster duplicate IDs check.

Changes from contributors and pull requests merged:

*None.*

Bugs fixed, short list:

* BUGFIX: row/col reference,
* BUGFIX: Suppress printing of the netlist file if there is None.
* BUGFIX: Add a wrapper around stdout to fix encoding errors on *UNIX, when no locale is set (PY2 only).
* BUGFIX: Print warning if the locale is not set.

Version 0.13 represents the culmination of efforts dating back to January and contains 135 commits.

This release features current-controlled current sources and voltage sources and new options to select the format of numbers printed for user display and how the MNA matrix is built in Symbolic Analysis.

Moreover, as in the previous releases, many commits were devoted to improving the documentation: you can find the new, improved documentation at http://ahkab.readthedocs.org/en/latest/

Features added:

* Implement CCCS, fixes 22
* Implement CCVS, fixes 21
* Add option to formulate the MNA and N matrices with resistors for symbolic analysis.
* Add options to suppress zeros and select printing precision.

Changes from contributors and pull requests merged:

*None.*

Bugs fixed, short list:

* BUGFIX: fix printing of missing elements.
* BUGFIX: fix missing import
* BUGFIX: reset look-up table when the temperature changes
* BUGFIX: catch missing matplotlib
* BUGFIX: remove early test It masks more detailed tests below.
* BUGFIX: fix get_netlist_elem_line()Pass the element nodes through nodes_dict
* BUGFIX: correct the netlist label for tran start time (tstart)
* BUGFIX: fix parsing of capacitors wrt comments.
* BUGFIX: fix all Symbols to be uppercase
* BUGFIX power by VCCS
* BUGFIX: Fix total power computation for GIsources.