Hi all,<br>I&#39;m trying to use \psxTick but I get &quot;Undefined control sequence&quot; when I run LaTeX.<br>Can anyone tell me what I am doing wrong?<br><br>I&#39;ve included the following packages:<br><br>\usepackage{pstricks,pstricks-add,pst-math,pst-plot,pst-3dplot}<br>
<br><br>This is my code:<br><br>\begin{figure}[hbt]<br>  \begin{center}<br>    \psset{xAxisLabel=,yAxisLabel=}<br>    \begin{psgraph}[ticks=none,Dx=2,Dy=2](0,0)(-5,-5)(5,5){0.5\textwidth}{!}<br>      \psxTick(1.5){$a^2$}<br>
      \psplot[linewidth=1.25pt,algebraic]{-4.0}{4.0}{ 3*sin(3.141592*x/8.0) }<br>    \end{psgraph}<br>  \end{center}<br>\end{figure<br><br><br>//Johan<br>