[OS X TeX] Gnuplot call from within pgfplot

[Joshua Smith]

All,

I am trying to use pgfplots to create a figure, and I am calling gnuplot to evaluate a specified function to create the data, as follows:

\begin{tikzpicture}
  \begin{axis}[xmin=0, xmax=0.011, ymin=0, ymax=1.1, scaled x ticks=base 10:3, xtick scale label code/.code={}]
    \addplot[\red, very thick] gnuplot[id=convection10, domain=0:0.010, samples=100] {(cosh(sqrt(4 * 100 / 14 / 0.005) * (0.010 - x)) + (100 / sqrt(4 * 100 / 14 / 0.005) / 14) * sinh(sqrt(4 * 100 / 14 / 0.005) * (0.010 - x))) / (cosh(sqrt(4 * 100 / 14 / 0.005) * 0.010) + (100 / sqrt(4 * 100 / 14 / 0.005) / 14) * sinh(sqrt(4 * 100 / 14 / 0.005) * 0.010))};
  \end{axis}
\end{tikzpicture}

I have installed gnuplot and I can call it manually from a Terminal window.  However, when I compile my TeX file using TeXShop, I get the error:

./09-13-2013 Main.tex:349: Package pgfplots Error: Sorry, the gnuplot-result file '"09-13-2013 Lecture Notes.convection10.table"' could not be found. Maybe you need to enable the shell-escape feature? For pdflatex, this is '>> pdflatex -shell-escape'. You can also invoke '>> gnuplot <file>.gnuplot' manually on the respective gnuplot file..

WIthin TeXShop, the engine is set to be

pdflatex --file-line-error --synctex=1 --shell-escape

so, why is gnuplot not being called automatically?

Thanks,
Josh
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