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<a href="Scientific-module.html">Package Scientific</a> ::
<a href="Scientific.Physics-module.html">Package Physics</a> ::
<a href="Scientific.Physics.PhysicalQuantities-module.html">Module PhysicalQuantities</a> ::
Class PhysicalUnit
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<!-- ==================== CLASS DESCRIPTION ==================== -->
<h1 class="epydoc">Class PhysicalUnit</h1><p class="nomargin-top"></p>
<p>Physical unit</p>
<p>A physical unit is defined by a name (possibly composite), a scaling
factor, and the exponentials of each of the SI base units that enter into
it. Units can be multiplied, divided, and raised to integer powers.</p>
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<td><span class="summary-sig"><a name="__div__"></a><span class="summary-sig-name">__div__</span>(<span class="summary-sig-arg">self</span>,
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<td><span class="summary-sig"><a href="Scientific.Physics.PhysicalQuantities.PhysicalUnit-class.html#__init__" class="summary-sig-name">__init__</a>(<span class="summary-sig-arg">self</span>,
<span class="summary-sig-arg">names</span>,
<span class="summary-sig-arg">factor</span>,
<span class="summary-sig-arg">powers</span>,
<span class="summary-sig-arg">offset</span>=<span class="summary-sig-default">0</span>)</span></td>
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<td><span class="summary-sig"><a name="__mul__"></a><span class="summary-sig-name">__mul__</span>(<span class="summary-sig-arg">self</span>,
<span class="summary-sig-arg">other</span>)</span></td>
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<td><span class="summary-sig"><a name="__pow__"></a><span class="summary-sig-name">__pow__</span>(<span class="summary-sig-arg">self</span>,
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<td><span class="summary-sig"><a name="__rdiv__"></a><span class="summary-sig-name">__rdiv__</span>(<span class="summary-sig-arg">self</span>,
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<span class="summary-type"> </span>
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<td><span class="summary-sig"><a name="__rmul__"></a><span class="summary-sig-name">__rmul__</span>(<span class="summary-sig-arg">self</span>,
<span class="summary-sig-arg">other</span>)</span></td>
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<td><span class="summary-sig"><a name="__str__"></a><span class="summary-sig-name">__str__</span>(<span class="summary-sig-arg">self</span>)</span></td>
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<span class="summary-type"><code>float</code></span>
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<td><span class="summary-sig"><a href="Scientific.Physics.PhysicalQuantities.PhysicalUnit-class.html#conversionFactorTo" class="summary-sig-name">conversionFactorTo</a>(<span class="summary-sig-arg">self</span>,
<span class="summary-sig-arg">other</span>)</span><br />
Returns:
the conversion factor from this unit to another unit</td>
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<span class="summary-type">(<code>float</code>, <code>float</code>)</span>
</td><td class="summary">
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<td><span class="summary-sig"><a href="Scientific.Physics.PhysicalQuantities.PhysicalUnit-class.html#conversionTupleTo" class="summary-sig-name">conversionTupleTo</a>(<span class="summary-sig-arg">self</span>,
<span class="summary-sig-arg">other</span>)</span><br />
Returns:
the conversion factor and offset from this unit to another unit</td>
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<span class="summary-type"> </span>
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<td><span class="summary-sig"><a name="isAngle"></a><span class="summary-sig-name">isAngle</span>(<span class="summary-sig-arg">self</span>)</span></td>
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<span class="summary-type"><code>bool</code></span>
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<td><span class="summary-sig"><a href="Scientific.Physics.PhysicalQuantities.PhysicalUnit-class.html#isCompatible" class="summary-sig-name">isCompatible</a>(<span class="summary-sig-arg">self</span>,
<span class="summary-sig-arg">other</span>)</span><br />
Returns:
<code>True</code> if the units are compatible, i.e.</td>
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<td><span class="summary-sig"><a name="isDimensionless"></a><span class="summary-sig-name">isDimensionless</span>(<span class="summary-sig-arg">self</span>)</span></td>
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<td><span class="summary-sig"><a name="name"></a><span class="summary-sig-name">name</span>(<span class="summary-sig-arg">self</span>)</span></td>
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<td><span class="summary-sig"><a name="setName"></a><span class="summary-sig-name">setName</span>(<span class="summary-sig-arg">self</span>,
<span class="summary-sig-arg">name</span>)</span></td>
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<a name="__init__"></a>
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<h3 class="epydoc"><span class="sig"><span class="sig-name">__init__</span>(<span class="sig-arg">self</span>,
<span class="sig-arg">names</span>,
<span class="sig-arg">factor</span>,
<span class="sig-arg">powers</span>,
<span class="sig-arg">offset</span>=<span class="sig-default">0</span>)</span>
<br /><em class="fname">(Constructor)</em>
</h3>
</td><td align="right" valign="top"
>
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<dl class="fields">
<dt>Parameters:</dt>
<dd><ul class="nomargin-top">
<li><strong class="pname"><code>names</code></strong> (<code>dict</code> or <code>str</code>) - a dictionary mapping each name component to its associated
integer power (e.g. <code>{'m': 1, 's': -1}</code>) for <i
class="math">m/s</i>). As a shorthand, a string may be passed
which is assigned an implicit power 1.</li>
<li><strong class="pname"><code>factor</code></strong> (<code>float</code>) - a scaling factor</li>
<li><strong class="pname"><code>powers</code></strong> (<code>list</code> of <code>int</code>) - the integer powers for each of the nine base units</li>
<li><strong class="pname"><code>offset</code></strong> (<code>float</code>) - an additive offset to the base unit (used only for temperatures)</li>
</ul></dd>
</dl>
</td></tr></table>
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<h3 class="epydoc"><span class="sig"><span class="sig-name">conversionFactorTo</span>(<span class="sig-arg">self</span>,
<span class="sig-arg">other</span>)</span>
</h3>
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>
</td>
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<dl class="fields">
<dt>Parameters:</dt>
<dd><ul class="nomargin-top">
<li><strong class="pname"><code>other</code></strong> (<a
href="Scientific.Physics.PhysicalQuantities.PhysicalUnit-class.html"
class="link">PhysicalUnit</a>) - another unit</li>
</ul></dd>
<dt>Returns: <code>float</code></dt>
<dd>the conversion factor from this unit to another unit</dd>
<dt>Raises:</dt>
<dd><ul class="nomargin-top">
<li><code><strong class='fraise'>TypeError</strong></code> - if the units are not compatible</li>
</ul></dd>
</dl>
</td></tr></table>
</div>
<a name="conversionTupleTo"></a>
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cellspacing="0" width="100%" bgcolor="white">
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<h3 class="epydoc"><span class="sig"><span class="sig-name">conversionTupleTo</span>(<span class="sig-arg">self</span>,
<span class="sig-arg">other</span>)</span>
</h3>
</td><td align="right" valign="top"
>
</td>
</tr></table>
<dl class="fields">
<dt>Parameters:</dt>
<dd><ul class="nomargin-top">
<li><strong class="pname"><code>other</code></strong> (<a
href="Scientific.Physics.PhysicalQuantities.PhysicalUnit-class.html"
class="link">PhysicalUnit</a>) - another unit</li>
</ul></dd>
<dt>Returns: (<code>float</code>, <code>float</code>)</dt>
<dd>the conversion factor and offset from this unit to another unit</dd>
<dt>Raises:</dt>
<dd><ul class="nomargin-top">
<li><code><strong class='fraise'>TypeError</strong></code> - if the units are not compatible</li>
</ul></dd>
</dl>
</td></tr></table>
</div>
<a name="isCompatible"></a>
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cellspacing="0" width="100%" bgcolor="white">
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<h3 class="epydoc"><span class="sig"><span class="sig-name">isCompatible</span>(<span class="sig-arg">self</span>,
<span class="sig-arg">other</span>)</span>
</h3>
</td><td align="right" valign="top"
>
</td>
</tr></table>
<dl class="fields">
<dt>Parameters:</dt>
<dd><ul class="nomargin-top">
<li><strong class="pname"><code>other</code></strong> (<a
href="Scientific.Physics.PhysicalQuantities.PhysicalUnit-class.html"
class="link">PhysicalUnit</a>) - another unit</li>
</ul></dd>
<dt>Returns: <code>bool</code></dt>
<dd><code>True</code> if the units are compatible, i.e. if the powers
of the base units are the same</dd>
</dl>
</td></tr></table>
</div>
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