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<pre class="prettyprint"><span class="k"><span class="k">set</span></span><span
 class="p"> </span><span class="nb"><span class="p">parametric</span></span><span
 class="p">
</span><span class="f"><span class="p">x</span></span><span class="o">(</span><span
 class="v"><span class="p">u</span></span><span class="o">,</span><span
 class="v"><span class="p">v</span></span><span class="o">)</span><span
 class="o"><span class="o">=</span></span><span class="p"> </span><span
 class="v"><span class="p">v</span></span><span class="o"><span
 class="o"><</span></span><span class="n"><span class="n">2</span></span><span
 class="o"><span class="o">*</span></span><span class="c"><span
 class="p">pi</span></span><span class="p"> </span><span class="o"><span
 class="o">?</span></span><span class="p"> </span><span class="p"><span
 class="o">(</span></span><span class="n"><span class="n">2.5</span></span><span
 class="n"><span class="o">-</span><span class="n">1</span></span><span
 class="n"><span class="n">.5</span></span><span class="o"><span
 class="o">*</span></span><span class="f"><span class="p">cos</span></span><span
 class="p"><span class="o">(</span></span><span class="v"><span
 class="p">v</span></span><span class="p"><span class="o">))</span></span><span
 class="o"><span class="o">*</span></span><span class="f"><span
 class="p">cos</span></span><span class="p"><span class="o">(</span></span><span
 class="v"><span class="p">u</span></span><span class="p"><span
 class="o">)</span></span><span class="o"><span class="p"> </span><span
 class="o">:</span></span><span class="p"> \
        </span><span class="v"><span class="p">v</span></span><span
 class="o"><span class="o"><</span></span><span class="n"><span
 class="n">3</span></span><span class="o"><span class="o">*</span></span><span
 class="c"><span class="p">pi</span></span><span class="p"> </span><span
 class="o"><span class="o">?</span></span><span class="p"> </span><span
 class="n"><span class="o">-</span><span class="n">2</span></span><span
 class="o"><span class="o">+</span></span><span class="p"><span
 class="o">(</span></span><span class="n"><span class="n">2</span></span><span
 class="o"><span class="o">+</span></span><span class="f"><span
 class="p">cos</span></span><span class="p"><span class="o">(</span></span><span
 class="v"><span class="p">u</span></span><span class="p"><span
 class="o">))</span></span><span class="o"><span class="o">*</span></span><span
 class="f"><span class="p">cos</span></span><span class="p"><span
 class="o">(</span></span><span class="v"><span class="p">v</span></span><span
 class="p"><span class="o">)</span></span><span class="o"><span
 class="p">    </span><span class="o">:</span></span><span class="p"> \
                 </span><span class="n"><span class="o">-</span><span
 class="n">2</span></span><span class="o"><span class="o">+</span></span><span
 class="n"><span class="n">2</span></span><span class="o"><span
 class="o">*</span></span><span class="f"><span class="p">cos</span></span><span
 class="p"><span class="o">(</span></span><span class="v"><span
 class="p">v</span></span><span class="p"><span class="o">)</span></span><span
 class="o"><span class="o">-</span></span><span class="f"><span
 class="p">cos</span></span><span class="p"><span class="o">(</span></span><span
 class="v"><span class="p">u</span></span><span class="p"><span
 class="o">)</span></span><span class="p">
</span><span class="f"><span class="p">y</span></span><span class="o">(</span><span
 class="v"><span class="p">u</span></span><span class="o">,</span><span
 class="v"><span class="p">v</span></span><span class="o">)</span><span
 class="o"><span class="o">=</span></span><span class="p"> </span><span
 class="v"><span class="p">v</span></span><span class="o"><span
 class="o"><</span></span><span class="n"><span class="n">2</span></span><span
 class="o"><span class="o">*</span></span><span class="c"><span
 class="p">pi</span></span><span class="p"> </span><span class="o"><span
 class="o">?</span></span><span class="p"> </span><span class="p"><span
 class="o">(</span></span><span class="n"><span class="n">2.5</span></span><span
 class="n"><span class="o">-</span><span class="n">1</span></span><span
 class="n"><span class="n">.5</span></span><span class="o"><span
 class="o">*</span></span><span class="f"><span class="p">cos</span></span><span
 class="p"><span class="o">(</span></span><span class="v"><span
 class="p">v</span></span><span class="p"><span class="o">))</span></span><span
 class="o"><span class="o">*</span></span><span class="f"><span
 class="p">sin</span></span><span class="p"><span class="o">(</span></span><span
 class="v"><span class="p">u</span></span><span class="p"><span
 class="o">)</span></span><span class="o"><span class="p"> </span><span
 class="o">:</span></span><span class="p"> \
                </span><span class="f"><span class="p">sin</span></span><span
 class="p"><span class="o">(</span></span><span class="v"><span
 class="p">u</span></span><span class="p"><span class="o">)</span></span><span
 class="p">
</span><span class="f"><span class="p">z</span></span><span class="o">(</span><span
 class="v"><span class="p">u</span></span><span class="o">,</span><span
 class="v"><span class="p">v</span></span><span class="o">)</span><span
 class="o"><span class="o">=</span></span><span class="p"> </span><span
 class="v"><span class="p">v</span></span><span class="o"><span
 class="o"><</span></span><span class="c"><span class="p">pi</span></span><span
 class="p">   </span><span class="o"><span class="o">?</span></span><span
 class="p"> </span><span class="n"><span class="o">-</span><span
 class="n">2</span></span><span class="n"><span class="n">.5</span></span><span
 class="o"><span class="o">*</span></span><span class="f"><span
 class="p">sin</span></span><span class="p"><span class="o">(</span></span><span
 class="v"><span class="p">v</span></span><span class="p"><span
 class="o">)</span></span><span class="o"><span class="p">             </span><span
 class="o">:</span></span><span class="p"> \
        </span><span class="v"><span class="p">v</span></span><span
 class="o"><span class="o"><</span></span><span class="n"><span
 class="n">2</span></span><span class="o"><span class="o">*</span></span><span
 class="c"><span class="p">pi</span></span><span class="p"> </span><span
 class="o"><span class="o">?</span></span><span class="p"> </span><span
 class="n"><span class="n">3</span></span><span class="o"><span
 class="o">*</span></span><span class="v"><span class="p">v</span></span><span
 class="n"><span class="o">-</span><span class="n">3</span></span><span
 class="o"><span class="o">*</span></span><span class="c"><span
 class="p">pi</span></span><span class="o"><span class="p">                </span><span
 class="o">:</span></span><span class="p"> \
        </span><span class="v"><span class="p">v</span></span><span
 class="o"><span class="o"><</span></span><span class="n"><span
 class="n">3</span></span><span class="o"><span class="o">*</span></span><span
 class="c"><span class="p">pi</span></span><span class="p"> </span><span
 class="o"><span class="o">?</span></span><span class="p"> </span><span
 class="p"><span class="o">(</span></span><span class="n"><span
 class="n">2</span></span><span class="o"><span class="o">+</span></span><span
 class="f"><span class="p">cos</span></span><span class="p"><span
 class="o">(</span></span><span class="v"><span class="p">u</span></span><span
 class="p"><span class="o">))</span></span><span class="o"><span
 class="o">*</span></span><span class="f"><span class="p">sin</span></span><span
 class="p"><span class="o">(</span></span><span class="v"><span
 class="p">v</span></span><span class="p"><span class="o">)</span></span><span
 class="o"><span class="o">+</span></span><span class="n"><span
 class="n">3</span></span><span class="o"><span class="o">*</span></span><span
 class="c"><span class="p">pi</span></span><span class="o"><span
 class="p">  </span><span class="o">:</span></span><span class="p"> \
                 </span><span class="n"><span class="o">-</span><span
 class="n">3</span></span><span class="o"><span class="o">*</span></span><span
 class="v"><span class="p">v</span></span><span class="o"><span
 class="o">+</span></span><span class="n"><span class="n">12</span></span><span
 class="o"><span class="o">*</span></span><span class="c"><span
 class="p">pi</span></span><span class="p">
</span><span class="k"><span class="k">splot</span></span><span
 class="p"> </span><span class="f"><span class="p">x</span></span><span
 class="p"><span class="o">(</span></span><span class="v"><span
 class="p">u</span></span><span class="o"><span class="o">,</span></span><span
 class="v"><span class="p">v</span></span><span class="p"><span
 class="o">)</span></span><span class="o"><span class="o">,</span></span><span
 class="f"><span class="p">y</span></span><span class="p"><span
 class="o">(</span></span><span class="v"><span class="p">u</span></span><span
 class="o"><span class="o">,</span></span><span class="v"><span
 class="p">v</span></span><span class="p"><span class="o">)</span></span><span
 class="o"><span class="o">,-</span></span><span class="f"><span
 class="p">z</span></span><span class="p"><span class="o">(</span></span><span
 class="v"><span class="p">u</span></span><span class="o"><span
 class="o">,</span></span><span class="v"><span class="p">v</span></span><span
 class="p"><span class="o">)</span></span><span class="p"> </span><span
 class="nb"><span class="p">w</span></span><span class="p"> </span><span
 class="nb"><span class="p">pm3d</span></span>
</pre>
<br>
<br>
Am 30.01.2013 17:29, schrieb Rich Shepard:
<blockquote
 cite="mid:alpine.LNX.2.00.1301300824530.17006@salmo.appl-ecosys.com"
 type="cite">  Several months ago I found a nice image of a Klein
bottle drawn with
  <br>
gnuplot, but the code was no longer available on the Web. So I searched
for
  <br>
PSTricks code to draw one rather than re-inventing the wheel, but did
not
  <br>
find any.
  <br>
  <br>
  Has anyone drawn such an image with PSTricks? If so, may I use and
modify
  <br>
the code? If not, please pass me a pointer where I should start to
create
  <br>
this image. The gnuplot version is attached as a .jpg file.
  <br>
  <br>
TIA,
  <br>
  <br>
Rich<br>
  <pre wrap="">
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