<font color='black' size='2' face='Arial, Helvetica, sans-serif'><font size="2"><font face="Arial, Helvetica, sans-serif">Dear Kari,<br>
<br>
</font></font>The result is perfect. Effectively, the parameter "N" (the number of field lines) can be used to obtain the best symmetry.<br>
<br>
<br>
<font size="2"><font face="Arial, Helvetica, sans-serif">B</font></font>est wishes<font color="black" face="Arial, Helvetica, sans-serif" size="2">
<div> <br>
manuel<br>
</div>
<div> <br>
</div>
<div style="clear: both;"></div>
<div> <br>
</div>
<div> <br>
</div>
<div style="font-family: arial,helvetica; font-size: 10pt; color: black;">-----E-mail d'origine-----<br>
De : Kari Eloranta <kari.eloranta@me.com><br>
A : pstricks@tug.org<br>
Envoyé le : Dimanche, 20 Février 2011 7:34<br>
Sujet : [pstricks] Re : about pst-electricfield<br>
<br>
<div id="AOLMsgPart_3_c636cd47-abfb-4bfc-a5ac-f728696f56a2">
<span class="Apple-style-span" style="font-family: Times;"><pre style="white-space: pre-wrap;">Dear Manuel,</pre><pre style="white-space: pre-wrap;">Thank you very, very much. I was only hoping my problem would be solved. I am writing material for my students, and now I am able to send them the text tomorrow. What a beautiful way to start a sunny Sunday morning :-)</pre><pre style="white-space: pre-wrap;">I modified the suggested code a bit to maintain symmetry (changed 16 to 15 in \psElectricfield).</pre><pre style="white-space: pre-wrap;"> </pre><pre><span class="Apple-style-span" style="white-space: pre-wrap;">\begin{center}<br>
\begin{pspicture*}(-4,-4)(4,4)<br>
\psframe*[linecolor=green!20](-4,-4)(4,4)<br>
\psgrid[subgriddiv=0,gridcolor=lightgray,griddots=10]<br>
\rput{90}(0,0){\psElectricfield[Q={[2 0 2 15][2 0 -2 15]}]}<br>
\rput[0](-2,0){\large{$+$}}<br>
\rput[0](2,0){\large{$+$}}<br>
\end{pspicture*}<br>
\end{center}</span></pre><pre style="white-space: pre-wrap;">Best regards,</pre><pre style="white-space: pre-wrap;"> Kari</pre><pre style="white-space: pre-wrap;"><br>
</pre><pre style="white-space: pre-wrap;">Dear Kari,<br>
<br>
Try with this code :<br>
<br>
\documentclass{article}<br>
\usepackage{pst-electricfield}<br>
\begin{document}<br>
\begin{center}<br>
\begin{pspicture*}(-4,-4)(4,4)<br>
\psframe*[linecolor=green!20](-4,-4)(4,4)<br>
\psgrid[subgriddiv=0,gridcolor=lightgray,griddots=10]<br>
\rput{90}(0,0){\psElectricfield[Q={[2 0 2 16][2 0 -2 16]}]}<br>
\rput[0](-2,0){\large{$+$}}<br>
\rput[0](2,0){\large{$+$}}<br>
\end{pspicture*}<br>
\end{center}<br>
\end{document} <br>
<br>
<br>
Best regards,<br>
<br>
<br>
M.L.<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
-----E-mail d'origine-----<br>
De : Kari Eloranta <<a target="_blank" href="http://tug.org/mailman/listinfo/pstricks">kari.eloranta at me.com</a>><br>
A : <a target="_blank" href="http://tug.org/mailman/listinfo/pstricks">pstricks at tug.org</a><br>
Envoyé le : Samedi, 19 Février 2011 15:25<br>
Sujet : [pstricks] about pst-electricfield<br>
<br>
<br>
<br>
<br>
I have used the pst-electricfield package to draw the field of two positive point charges. However, the code below produces<br>
a line connecting the two charges. I do not think that it should be like that, but more like in <a target="_blank" href="http://dev.physicslab.org/Document.aspx?doctype=3&filename=Electrostatics_PointChargesElectricFields.xml.">http://dev.physicslab.org/Document.aspx?doctype=3&filename=Electrostatics_PointChargesElectricFields.xml.</a><br>
<br>
<br>
Am I mistaken? If I am not, is there a way of correcting it?<br>
<br>
<br>
Best regards,<br>
Kari<br>
<br>
<br>
<br>
<br>
\begin{center}<br>
\begin{pspicture*}(-4,-3)(4,3)<br>
\psframe*[linecolor=green!20](-4,-3)(4,3)<br>
\psgrid[subgriddiv=0,gridcolor=lightgray,griddots=10]<br>
\psElectricfield[Q={[2 -2 0][2 2 0]}]<br>
\rput[0](-2,0){\large{$+$}} \rput[0](2,0){\large{$+$}}<br>
\end{pspicture*}\label{fig:twoEqPointCharges}\caption{The electric field of two equal positive point charges.}<br>
\end{center}<br>
<br>
<br>
***************************************<br>
Kari Eloranta<br>
Ketunpolku 1<br>
40400 Jyväskylä<br>
Puh: +358 40 586 7654</pre></span>
<div><br>
</div>
<div><span class="Apple-style-span" style="font-size: 12px;">
<div style="word-wrap: break-word;"><span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px;">
<div style="word-wrap: break-word;">
<div>
<div><br>
</div>
<div>***************************************</div>
<div>Kari Eloranta</div>
<div>Ketunpolku 1</div>
<div>40400 Jyväskylä</div>
<div>Puh: +358 40 586 7654</div>
</div>
<div><br>
</div>
</div>
</span><br class="Apple-interchange-newline"></div>
</span><br class="Apple-interchange-newline"><br class="Apple-interchange-newline">
</div>
<br>
=
</div>
<!-- end of AOLMsgPart_3_c636cd47-abfb-4bfc-a5ac-f728696f56a2 -->
<div id="AOLMsgPart_4_c636cd47-abfb-4bfc-a5ac-f728696f56a2" style="margin: 0px; font-family: Tahoma,Verdana,Arial,Sans-Serif; font-size: 12px; color: rgb(0, 0, 0); background-color: rgb(255, 255, 255);">
<pre style="font-size: 9pt;"><tt>_______________________________________________<br>
PSTricks mailing list<br>
<a href="mailto:PSTricks@tug.org">PSTricks@tug.org</a><br>
<a href="http://tug.org/mailman/listinfo/pstricks" target="_blank">http://tug.org/mailman/listinfo/pstricks</a><br>
archive: <a href="http://www.tug.org/pipermail/pstricks/" target="_blank">http://www.tug.org/pipermail/pstricks/</a><br>
</tt></pre>
</div>
<!-- end of AOLMsgPart_4_c636cd47-abfb-4bfc-a5ac-f728696f56a2 -->
</div>
</font></font>