Split PDF into single pages

pdftk p_node_edit_operations.pdf burst output p_node_edit_operations_%02d.pdf

Colour a vector depending on a condition in gnuplot

plot "data.txt" using 1:2:(+0):(-($2-$3)):(($2 > $3) ? (rgb("0","255","0")):(rgb("255","0","0"))) notitle with vectors lc rgb variable

plot arrows between values in gnuplot

plot "data.txt" using 1:2 title "orig" lt 2 pt 2, \
 "data.txt" using 1:3 title "step 1 1" lt 1 pt 3, \
 "data.txt" using 1:2:(+0):(-($2-$3)) notitle with vectors arrowstyle 1

Crop a PDF with Latex

\documentclass{article}
\usepackage{graphicx}
\usepackage[active,tightpage]{preview}
\PreviewMacro[{*[][]{}}]{\includegraphics}
\begin{document}
\pagestyle {empty}

\includegraphics[viewport=0 270 420 570]{NawrockiFig-crop.pdf}

\end{document}