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<p>The instance attributes are created during and on conclusion of
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calling the <aclass="reference internal" href="#MDAnalysis.analysis.base.AnalysisBase.run" title="MDAnalysis.analysis.base.AnalysisBase.run"><codeclass="xref py py-meth docutils literal notranslate"><spanclass="pre">AnalysisBase.run()</span></code></a> method. Accessing an attribute
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before it has been created will raise an <aclass="reference external" href="https://docs.python.org/3/library/exceptions.html#AttributeError" title="(in Python v3.13)"><codeclass="xref py py-exc docutils literal notranslate"><spanclass="pre">AttributeError</span></code></a>.</p>
<spanclass="sig-name descname"><spanclass="pre">times</span></span><aclass="headerlink" href="#MDAnalysis.analysis.base.AnalysisBase.times" title="Link to this definition"></a></dt>
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<dd><p>array of Timestep times. Only exists after calling
<spanclass="sig-name descname"><spanclass="pre">frames</span></span><aclass="headerlink" href="#MDAnalysis.analysis.base.AnalysisBase.frames" title="Link to this definition"></a></dt>
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<dd><p>array of Timestep frame indices. Only exists after calling
<spanclass="sig-name descname"><spanclass="pre">results</span></span><aclass="headerlink" href="#MDAnalysis.analysis.base.AnalysisBase.results" title="Link to this definition"></a></dt>
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<dd><p>results of calculation are stored after call
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to <aclass="reference internal" href="#MDAnalysis.analysis.base.AnalysisBase.run" title="MDAnalysis.analysis.base.AnalysisBase.run"><codeclass="xref py py-meth docutils literal notranslate"><spanclass="pre">AnalysisBase.run()</span></code></a></p>
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<dd><p>Results of calculation are stored here, after call
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to <aclass="reference internal" href="#MDAnalysis.analysis.base.AnalysisBase.run" title="MDAnalysis.analysis.base.AnalysisBase.run"><codeclass="xref py py-meth docutils literal notranslate"><spanclass="pre">AnalysisBase.run()</span></code></a>.</p>
<spanclass="sig-name descname"><spanclass="pre">n_frames</span></span><aclass="headerlink" href="#MDAnalysis.analysis.base.AnalysisBase.n_frames" title="Link to this definition"></a></dt>
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<dd><p>number of <em>analyzed</em> frames, i.e., after taking into account
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the <cite>start</cite>, <cite>stop</cite>, and <cite>step</cite> values from
<spanclass="sig-name descname"><spanclass="pre">start</span></span><aclass="headerlink" href="#MDAnalysis.analysis.base.AnalysisBase.start" title="Link to this definition"></a></dt>
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<dd><p>Frame index of the first trajectory frame that was analyzed.
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Only exists after calling <aclass="reference internal" href="#MDAnalysis.analysis.base.AnalysisBase.run" title="MDAnalysis.analysis.base.AnalysisBase.run"><codeclass="xref py py-meth docutils literal notranslate"><spanclass="pre">AnalysisBase.run()</span></code></a>.</p>
<spanclass="sig-name descname"><spanclass="pre">stop</span></span><aclass="headerlink" href="#MDAnalysis.analysis.base.AnalysisBase.stop" title="Link to this definition"></a></dt>
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<dd><p>Frame index of the last trajectory frame that was analyzed.
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Only exists after calling <aclass="reference internal" href="#MDAnalysis.analysis.base.AnalysisBase.run" title="MDAnalysis.analysis.base.AnalysisBase.run"><codeclass="xref py py-meth docutils literal notranslate"><spanclass="pre">AnalysisBase.run()</span></code></a>.</p>
<spanclass="sig-name descname"><spanclass="pre">step</span></span><aclass="headerlink" href="#MDAnalysis.analysis.base.AnalysisBase.step" title="Link to this definition"></a></dt>
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<dd><p>Every <cite>step</cite> frame was analyzed, as <codeclass="docutils literal notranslate"><spanclass="pre">trajectory[start:stop:step]</span></code>.
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Only exists after calling <aclass="reference internal" href="#MDAnalysis.analysis.base.AnalysisBase.run" title="MDAnalysis.analysis.base.AnalysisBase.run"><codeclass="xref py py-meth docutils literal notranslate"><spanclass="pre">AnalysisBase.run()</span></code></a>.</p>
<spanclass="sig-name descname"><spanclass="pre">DEFAULT_ACCEPTORS</span></span><emclass="property"><spanclass="w"></span><spanclass="p"><spanclass="pre">=</span></span><spanclass="w"></span><spanclass="pre">{'CHARMM27':</span><spanclass="pre">('OE2',</span><spanclass="pre">'OW',</span><spanclass="pre">'OG',</span><spanclass="pre">'OE1',</span><spanclass="pre">'OH',</span><spanclass="pre">'O',</span><spanclass="pre">'OD2',</span><spanclass="pre">'ND1',</span><spanclass="pre">'OH2',</span><spanclass="pre">'OC1',</span><spanclass="pre">'OD1',</span><spanclass="pre">'SD',</span><spanclass="pre">'OC2',</span><spanclass="pre">'NE2',</span><spanclass="pre">'OG1',</span><spanclass="pre">'SG'),</span><spanclass="pre">'GLYCAM06':</span><spanclass="pre">('OW',</span><spanclass="pre">'OS',</span><spanclass="pre">'OY',</span><spanclass="pre">'N',</span><spanclass="pre">'NT',</span><spanclass="pre">'OH',</span><spanclass="pre">'SM',</span><spanclass="pre">'O',</span><spanclass="pre">'O2'),</span><spanclass="pre">'other':</span><spanclass="pre">()}</span></em><aclass="headerlink" href="#MDAnalysis.analysis.hydrogenbonds.wbridge_analysis.WaterBridgeAnalysis.DEFAULT_ACCEPTORS" title="Link to this definition"></a></dt>
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<spanclass="sig-name descname"><spanclass="pre">DEFAULT_ACCEPTORS</span></span><emclass="property"><spanclass="w"></span><spanclass="p"><spanclass="pre">=</span></span><spanclass="w"></span><spanclass="pre">{'CHARMM27':</span><spanclass="pre">('OG',</span><spanclass="pre">'SD',</span><spanclass="pre">'NE2',</span><spanclass="pre">'SG',</span><spanclass="pre">'OC1',</span><spanclass="pre">'OE2',</span><spanclass="pre">'OD1',</span><spanclass="pre">'OH2',</span><spanclass="pre">'OH',</span><spanclass="pre">'OC2',</span><spanclass="pre">'OE1',</span><spanclass="pre">'ND1',</span><spanclass="pre">'OG1',</span><spanclass="pre">'OW',</span><spanclass="pre">'OD2',</span><spanclass="pre">'O'),</span><spanclass="pre">'GLYCAM06':</span><spanclass="pre">('N',</span><spanclass="pre">'NT',</span><spanclass="pre">'OH',</span><spanclass="pre">'O2',</span><spanclass="pre">'OS',</span><spanclass="pre">'OW',</span><spanclass="pre">'OY',</span><spanclass="pre">'SM',</span><spanclass="pre">'O'),</span><spanclass="pre">'other':</span><spanclass="pre">()}</span></em><aclass="headerlink" href="#MDAnalysis.analysis.hydrogenbonds.wbridge_analysis.WaterBridgeAnalysis.DEFAULT_ACCEPTORS" title="Link to this definition"></a></dt>
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<dd><p>default atom names that are treated as hydrogen <em>acceptors</em>
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(see <aclass="reference internal" href="#default-atom-names-for-water-bridge-analysis"><spanclass="std std-ref">Default heavy atom names for CHARMM27 force field.</span></a>);
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use the keyword <cite>acceptors</cite> to add a list of additional acceptor names.</p>
<spanclass="sig-name descname"><spanclass="pre">DEFAULT_DONORS</span></span><emclass="property"><spanclass="w"></span><spanclass="p"><spanclass="pre">=</span></span><spanclass="w"></span><spanclass="pre">{'CHARMM27':</span><spanclass="pre">('OW',</span><spanclass="pre">'OG',</span><spanclass="pre">'ND1',</span><spanclass="pre">'NZ',</span><spanclass="pre">'ND2',</span><spanclass="pre">'NE',</span><spanclass="pre">'NH1',</span><spanclass="pre">'N',</span><spanclass="pre">'NH2',</span><spanclass="pre">'OH',</span><spanclass="pre">'NE2',</span><spanclass="pre">'OG1',</span><spanclass="pre">'OH2',</span><spanclass="pre">'SG',</span><spanclass="pre">'NE1'),</span><spanclass="pre">'GLYCAM06':</span><spanclass="pre">('OW',</span><spanclass="pre">'N',</span><spanclass="pre">'NT',</span><spanclass="pre">'OH',</span><spanclass="pre">'N3'),</span><spanclass="pre">'other':</span><spanclass="pre">()}</span></em><aclass="headerlink" href="#MDAnalysis.analysis.hydrogenbonds.wbridge_analysis.WaterBridgeAnalysis.DEFAULT_DONORS" title="Link to this definition"></a></dt>
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<spanclass="sig-name descname"><spanclass="pre">DEFAULT_DONORS</span></span><emclass="property"><spanclass="w"></span><spanclass="p"><spanclass="pre">=</span></span><spanclass="w"></span><spanclass="pre">{'CHARMM27':</span><spanclass="pre">('OG',</span><spanclass="pre">'N',</span><spanclass="pre">'OH2',</span><spanclass="pre">'OH',</span><spanclass="pre">'ND2',</span><spanclass="pre">'NE2',</span><spanclass="pre">'ND1',</span><spanclass="pre">'OG1',</span><spanclass="pre">'NE1',</span><spanclass="pre">'NH2',</span><spanclass="pre">'OW',</span><spanclass="pre">'NZ',</span><spanclass="pre">'SG',</span><spanclass="pre">'NH1',</span><spanclass="pre">'NE'),</span><spanclass="pre">'GLYCAM06':</span><spanclass="pre">('N3',</span><spanclass="pre">'N',</span><spanclass="pre">'NT',</span><spanclass="pre">'OH',</span><spanclass="pre">'OW'),</span><spanclass="pre">'other':</span><spanclass="pre">()}</span></em><aclass="headerlink" href="#MDAnalysis.analysis.hydrogenbonds.wbridge_analysis.WaterBridgeAnalysis.DEFAULT_DONORS" title="Link to this definition"></a></dt>
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<dd><p>default heavy atom names whose hydrogens are treated as <em>donors</em>
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(see <aclass="reference internal" href="#default-atom-names-for-water-bridge-analysis"><spanclass="std std-ref">Default heavy atom names for CHARMM27 force field.</span></a>);
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use the keyword <cite>donors</cite> to add a list of additional donor names.</p>
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