tkz-fct not creating a visible graph

Question

I've tried copying a pasting code from various examples posted on this site and in the manual, but the graph is never visible.

MWE: (this MWE comes from this posting)

\documentclass[tikz]{standalone}
\usepackage{tkz-fct}
\begin{document}
\begin{tikzpicture}[>=stealth']
\tkzInit[xmin=-15,xmax=25,
         ymin=-250,ymax=50,
         xstep=5,ystep=50]
\tkzAxeXY
\tkzFct[domain=-10:24,color=blue,very thick,<->]{14*\x-\x**2}
\end{tikzpicture}
\end{document}

Results in:

Answer 1

Note that tkz-fct doesn't do the calculations itself, they are performed by Gnuplot (I think). Therefore, you need to allow for execution of external programs by compiling with the --shell-escape flag, i.e.

pdflatex -shell-escape filename.tex

There will be a warning in the log related to this, saying something like

Package pgf Warning: Plot data file `filename.tkzfct.table' not found. on input line 32.

The .table file is generated by Gnuplot, and read by tkz-fct, without -shell-escape you wont get that file.