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ahkab: Ahkab v 0.18

Giuseppe Venturini; Ian Daniher; endolith; Shahar Or

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    <subfield code="a">&lt;a class="anchor" href="#changelog-for-v-018"&gt;&lt;span class="octicon octicon-link"&gt;&lt;/span&gt;&lt;/a&gt;Changelog for v 0.18

&lt;p&gt;Version 0.18 represents the culmination of almost two months of efforts, yet
another step in the current time-based release scheme.&lt;/p&gt;

&lt;p&gt;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.&lt;/p&gt;

&lt;p&gt;Moreover, as in the previous releases, several commits were devoted to improving
the documentation: you can find the new, improved documentation online at
&lt;a href=""&gt;;/a&gt;&lt;/p&gt;

&lt;a class="anchor" href="#features-added"&gt;&lt;span class="octicon octicon-link"&gt;&lt;/span&gt;&lt;/a&gt;Features added:

&lt;li&gt;Add .FOUR and .FFT support&lt;/li&gt;
&lt;li&gt;Add PWL waveforms (available from python only)&lt;/li&gt;

&lt;a class="anchor" href="#backwards-incompatible-changes"&gt;&lt;span class="octicon octicon-link"&gt;&lt;/span&gt;&lt;/a&gt;Backwards incompatible changes:

&lt;li&gt;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'.&lt;/li&gt;

&lt;p&gt;User code can be usually easily fixed substituting 2*pi*r[w] with r[f]
or the like. Sorry for any trouble this creates.&lt;/p&gt;

&lt;a class="anchor" href="#changes-from-contributors-and-pull-requests-merged"&gt;&lt;span class="octicon octicon-link"&gt;&lt;/span&gt;&lt;/a&gt;Changes from contributors and pull requests merged:

&lt;p&gt;&lt;em&gt;None.&lt;/em&gt; &lt;/p&gt;

&lt;a class="anchor" href="#bugs-fixed-short-list"&gt;&lt;span class="octicon octicon-link"&gt;&lt;/span&gt;&lt;/a&gt;Bugs fixed, short list:

&lt;p&gt;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 -&amp;gt; return t=0
BUGFIX: convert to uppercase before comparison&lt;/p&gt;</subfield>
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