The {\tt psline} command can be used in a multitude of ways.


There is a special option on {\tt psline} that allows you to specify dots and arrows. 


\psset{unit=1cm}
\begin{center}
\begin{pspicture}(-2.5,-1)(7.6,4)
\psline(-2,0)(-2,2)
\psline{-*}(-1,0)(-1,2)
\psline{*-}(0,0)(0,2)
\psline{*-*}(1,0)(1,2)
\psline{<-*}(2,0)(2,2)
\psline{*->}(3,0)(3,2)
\psline{<->}(4,0)(4,2)
\psline{<-}(5,0)(5,2)
\psline{->}(6,0)(6,2)
\psline(7,0)(7,2)
\end{pspicture}
\end{center}

Which can be produced with the following source:

\begin{verbatim}
\begin{pspicture}(-2.5,-1)(7.6,4)
\psline(-2,0)(-2,2)
\psline{-*}(-1,0)(-1,2)
\psline{*-}(0,0)(0,2)
\psline{*-*}(1,0)(1,2)
\psline{<-*}(2,0)(2,2)
\psline{*->}(3,0)(3,2)
\psline{<->}(4,0)(4,2)
\psline{<-}(5,0)(5,2)
\psline{->}(6,0)(6,2)
\psline(7,0)(7,2)
\end{pspicture}
\end{verbatim}



They can be useful for creating kronecker delta plots:


\psset{unit=1cm}
\begin{center}
\begin{pspicture}(-3,-1)(4,4)
    
\rput(-2.5,1.5){$\cdots$}
\rput(3.5,1.5){$\cdots$}

\psline{-*}(-2,0)(-2,2)
\rput(-1.7,2){(2)}
\rput(-2,-0.3){-2}

\psline{-*}(-1,0)(-1,3)
\rput(-0.7,3){(3)}
\rput(-1,-0.3){-1}


\psline{-*}(0,0)(0,2)
\rput(0.3,2){(2)}
\rput(0,-0.3){0}


\psline{-*}(1,0)(1,3)
\rput(1.3,3){(3)}
\rput(1,-0.3){1}


\psline{-*}(2,0)(2,2)
\rput(2.3,2){(2)}
\rput(2,-0.3){2}


\psline{-*}(3,0)(3,3)
\rput(3.3,3){(3)}
\rput(3,-0.3){3}

\psline{->}(-3,0)(4,0)
\rput(4,-0.3){ $n$ }
\rput(4,3){ $x(n)$ }

\end{pspicture}
\end{center}


\psset{unit=1cm}
\begin{verbatim}
\begin{pspicture}(-3,-1)(4,4) 
\rput(-2.5,1.5){$\cdots$}
\rput(3.5,1.5){$\cdots$}
\psline{-*}(-2,0)(-2,2)
\rput(-1.7,2){(2)}
\rput(-2,-0.3){-2}
\psline{-*}(-1,0)(-1,3)
\rput(-0.7,3){(3)}
\rput(-1,-0.3){-1}
\psline{-*}(0,0)(0,2)
\rput(0.3,2){(2)}
\rput(0,-0.3){0}
\psline{-*}(1,0)(1,3)
\rput(1.3,3){(3)}
\rput(1,-0.3){1}
\psline{-*}(2,0)(2,2)
\rput(2.3,2){(2)}
\rput(2,-0.3){2}
\psline{-*}(3,0)(3,3)
\rput(3.3,3){(3)}
\rput(3,-0.3){3}
\psline{->}(-3,0)(4,0)
\rput(4,-0.3){ $n$ }
\rput(4,3){ $x(n)$ }
\end{pspicture}
\end{verbatim}


Other uses include creating representations of vectors:


\psset{unit=1cm}
\begin{center}
\begin{pspicture}(-3,-6)(3,6)
    

\psline{->}(0,-6)(0,-1)
\psline{->}(-2.5,-3.5)(2.5,-3.5)


\rput(0.8,-4.8){$\Psi_1 = \left[ \begin{array}{r} 1 \\ -1 \\ \end{array} \right]$}
\psline[linewidth=1.5 pt]{->}(0,-3.5)(1,-4.5)

\rput(2.22487174976714,-2){$\vec{x}$}
\psline[linewidth=1.5 pt]{->}(0,-3.5)(2.42487174976714,-2.10000107243568)

\rput(0.8,-2.5){$\Psi_0 = \left[ \begin{array}{r} 1 \\ 1 \\ \end{array} \right]$}
\psline[linewidth=1.5 pt]{->}(0,-3.5)(1,-2.5)

\psline{->}(0,0)(0,5)


\psline{->}(-2.5,2.5)(2.5,2.5)

\rput(2.22487174976714,3.95){$\vec{x}$}
\psline[linewidth=1.5 pt]{->}(0,2.5)(2.42487174976714,3.89999892756432)


\rput(1,2){$\Psi_0 = \left[ \begin{array}{r} 1 \\ 0 \\ \end{array} \right]$}
\psline[linewidth=1.5 pt]{->}(0,2.5)(0,3.5)


\rput(0,3.5){$\Psi_1 = \left[ \begin{array}{r} 0 \\ 1 \\ \end{array} \right]$}
\psline[linewidth=1.5 pt]{->}(0,2.5)(1,2.5)

\end{pspicture}
\end{center}

Which can be created with the following source:

\psset{unit=1cm}
\begin{verbatim}
\begin{pspicture}(-3,-6)(3,6)
\psline{->}(0,-6)(0,-1)
\psline{->}(-2.5,-3.5)(2.5,-3.5)
\rput(0.8,-4.8){$\Psi_1 = \left[ \begin{array}{r} 1 \\ -1 \\ \end{array} \right]$}
\psline[linewidth=1.5 pt]{->}(0,-3.5)(1,-4.5)
\rput(2.22487174976714,-2){$\vec{x}$}
\psline[linewidth=1.5 pt]{->}(0,-3.5)(2.42487174976714,-2.10000107243568)
\rput(0.8,-2.5){$\Psi_0 = \left[ \begin{array}{r} 1 \\ 1 \\ \end{array} \right]$}
\psline[linewidth=1.5 pt]{->}(0,-3.5)(1,-2.5)
\psline{->}(0,0)(0,5)
\psline{->}(-2.5,2.5)(2.5,2.5)
\rput(2.22487174976714,3.95){$\vec{x}$}
\psline[linewidth=1.5 pt]{->}(0,2.5)(2.42487174976714,3.89999892756432)
\rput(1,2){$\Psi_0 = \left[ \begin{array}{r} 1 \\ 0 \\ \end{array} \right]$}
\psline[linewidth=1.5 pt]{->}(0,2.5)(0,3.5)
\rput(0,3.5){$\Psi_1 = \left[ \begin{array}{r} 0 \\ 1 \\ \end{array} \right]$}
\psline[linewidth=1.5 pt]{->}(0,2.5)(1,2.5)
\end{pspicture}
\end{verbatim}

You can also use {\tt linestyle=dashed} in the options. 


\psset{unit=1cm}
\begin{center}
\begin{pspicture}(-2.5,-1)(7.6,4)
\psline[linestyle=dashed](-2,0)(-2,2)
\psline[linestyle=dashed]{-*}(-1,0)(-1,2)
\psline[linestyle=dashed]{*-}(0,0)(0,2)
\psline[linestyle=dashed]{*-*}(1,0)(1,2)
\psline[linestyle=dashed]{<-*}(2,0)(2,2)
\psline[linestyle=dashed]{*->}(3,0)(3,2)
\psline[linestyle=dashed]{<->}(4,0)(4,2)
\psline[linestyle=dashed]{<-}(5,0)(5,2)
\psline[linestyle=dashed]{->}(6,0)(6,2)
\psline[linestyle=dashed](7,0)(7,2)
\end{pspicture}
\end{center}

Which can be produced with the following source:

\begin{verbatim}
\begin{pspicture}(-2.5,-1)(7.6,4)
\psline[linestyle=dashed](-2,0)(-2,2)
\psline[linestyle=dashed]{-*}(-1,0)(-1,2)
\psline[linestyle=dashed]{*-}(0,0)(0,2)
\psline[linestyle=dashed]{*-*}(1,0)(1,2)
\psline[linestyle=dashed]{<-*}(2,0)(2,2)
\psline[linestyle=dashed]{*->}(3,0)(3,2)
\psline[linestyle=dashed]{<->}(4,0)(4,2)
\psline[linestyle=dashed]{<-}(5,0)(5,2)
\psline[linestyle=dashed]{->}(6,0)(6,2)
\psline[linestyle=dashed](7,0)(7,2)
\end{pspicture}
\end{verbatim}
