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I tried your code and everything seems to be OK (see attachment)<br>
So the problem lies somewhere else (version ?)<br>
<br>
Philippe Camus<br>
<br>
<br>
On 2010-04-30 20:30, Zbigniew Nitecki wrote:
<blockquote cite="mid:F29C9173-729F-41C2-B44D-3905EEAA1FEA@tufts.edu"
type="cite">
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I'm attaching a file and an output picture. Briefly, here is the code:
<div>
<blockquote type="cite">
<div><span> </span> \begin{pspicture}(-3.5,-3)(3.5,3.5) </div>
<div><span> </span> \psset{Alpha=90, Beta=30} </div>
<div><span> </span> \multido{\rt=0+20}{18}{% </div>
<div><span> </span> \pstThreeDLine[arrows=->, arrowscale=2,
linewidth=2pt, linecolor=gray]% </div>
<div><span> </span> (\rt\space cos 3 mul, \rt\space sin 3 mul, 0)%
</div>
<div><span> </span> (\rt\space cos 3 \rt\space 2 div sin 1.5 mul
sub mul,% </div>
<div><span> </span> \rt\space sin 3 \rt\space 2 div sin 1.5 mul
sub mul,% </div>
<div><span> </span> \rt\space 2 div cos 1.5 mul)% </div>
<div><span> </span> } </div>
<div><span> </span></div>
<div><span> </span>
\parametricplotThreeD[yPlotpoints=100](-1,1)(0,360){ </div>
<div><span> </span> u 0.5 mul cos t mul 3 add u cos mul % </div>
<div><span> </span> u 0.5 mul cos t mul 3 add u sin mul % </div>
<div><span> </span> u 0.5 mul sin t mul% </div>
<div><span> </span> } </div>
<div><span> </span></div>
<div><span> </span> \parametricplotThreeD[plotstyle=curve,
linewidth=2pt](0,720){ </div>
<div><span> </span> t 0.5 mul cos 3 add t cos mul % </div>
<div><span> </span> t 0.5 mul cos 3 add t sin mul % </div>
<div><span> </span> t 0.5 mul sin% </div>
<div><span> </span> } </div>
<div><span> </span></div>
<div><span> </span> \parametricplotThreeD[plotstyle=curve,
linestyle=dashed, linewidth=2pt]% </div>
<div><span> </span> (0,360){t cos 3 mul t sin 3 mul 0} </div>
<div><span> </span> \end{pspicture} </div>
</blockquote>
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<div><span>
<p>Note the following features: the first multido draws gray arrows,
whose starting points should lie on the dashed given by the last
parametricplot.</p>
<div>I don't see any difference between the coding of the curve and
of the starting points (other than \rt in place of u). Yet look where
the arrow start.</div>
<div><br>
</div>
<div>What have I done wrong?</div>
<p><br>
</p>
<p><br>
</p>
<p> </p>
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<p> </p>
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<div><span>
<p> <br>
Zbigniew Nitecki </p>
<p> Department of Mathematics </p>
<p> Tufts University </p>
<p> Medford, MA 02155 </p>
<p><br>
</p>
<p> telephones: </p>
<p> Office<span><span> <span> </span></span></span>(617)627-3843 </p>
<p> Dept.<span><span> <span> </span></span></span>(617)627-3234 </p>
<p> Dept. fax<span><span> <span> </span></span></span>(617)627-3966
</p>
<a moz-do-not-send="true" href="http://www.tufts.edu/%7Eznitecki/">http://www.tufts.edu/~znitecki/</a></span>
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