Tukukkk

I am not sure why this doesn't work. At first I thought the issue was x values close to zero. So I broke it up into two separate graphs that ignored x values close to zero. I have tried copying code snippets form others. Theirs works (using different function to graph), but mine does not.

The error I get is:! PGF Math Error: p' orp(' in {2500*exp(0.05*-10.0)/(100+25*(exp(0.05*-10.0)-1))}')

documentclass{standalone}



usepackage{tikz}



begin{document}



begin{center}

    begin{tikzpicture}[scale=0.1]

            draw [<->,very thick] (0,-10) -- (0,100) node [above] {$y$};

            draw [<->,very thick] (-10,0) -- (160,0) node [right] {$x$};

            draw [domain=-10:160,samples=1000] plot (x,{2500*exp(0.05*x)/(100+25*(exp(0.05*x)-1))});

        end{tikzpicture}

end{center}

It is because the dimension is too large to plot. A work around is to rewrite the function to be plotted in a way that it won't cause dimension too large error.

documentclass[border=3mm]{standalone}

usepackage{tikz}

begin{document}

    begin{tikzpicture}[scale=0.1]

            draw [<->,very thick] (0,-10) -- (0,100) node [above] {$y$};

            draw [<->,very thick] (-10,0) -- (160,0) node [right] {$x$};

            draw [domain=-10:160,samples=100] plot (x,{100/(1+3*(exp(-0.05*x))});

        end{tikzpicture}

end{document}

For comparism purpose. Run with xelatex

documentclass[pstricks]{standalone}

usepackage{pst-plot}

begin{document}



begin{psgraph}[Dx=25,Dy=25,llx=-0.5,lly=-0.5,

     urx=0.5,ury=0.5,xAxisLabel=$x$,

     yAxisLabel=$y$]{->}(0,0)(-15,-10)(160,110){10cm}{8cm}

 psplot[plotpoints=1000,algebraic,linewidth=1.5pt,

   linecolor=blue]{-10}{160}{2500*Euler^(0.05*x)/(100+25*(Euler^(0.05*x)-1))}

end{psgraph}   



end{document}