How to graph a logistic equation using tikz











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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}









share|improve this question




























    up vote
    3
    down vote

    favorite












    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}









    share|improve this question


























      up vote
      3
      down vote

      favorite









      up vote
      3
      down vote

      favorite











      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}









      share|improve this question















      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}






      tikz-pgf






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      share|improve this question




      share|improve this question








      edited 1 hour ago

























      asked 1 hour ago









      Garth Fleming

      36718




      36718






















          2 Answers
          2






          active

          oldest

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          up vote
          4
          down vote



          accepted










          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}


          enter image description here






          share|improve this answer





















          • Thank you so much...this works great. I had fun reproducing the math as well.
            – Garth Fleming
            28 mins ago


















          up vote
          3
          down vote













          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}


          enter image description here






          share|improve this answer























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            2 Answers
            2






            active

            oldest

            votes








            2 Answers
            2






            active

            oldest

            votes









            active

            oldest

            votes






            active

            oldest

            votes








            up vote
            4
            down vote



            accepted










            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}


            enter image description here






            share|improve this answer





















            • Thank you so much...this works great. I had fun reproducing the math as well.
              – Garth Fleming
              28 mins ago















            up vote
            4
            down vote



            accepted










            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}


            enter image description here






            share|improve this answer





















            • Thank you so much...this works great. I had fun reproducing the math as well.
              – Garth Fleming
              28 mins ago













            up vote
            4
            down vote



            accepted







            up vote
            4
            down vote



            accepted






            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}


            enter image description here






            share|improve this answer












            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}


            enter image description here







            share|improve this answer












            share|improve this answer



            share|improve this answer










            answered 57 mins ago









            nidhin

            2,769926




            2,769926












            • Thank you so much...this works great. I had fun reproducing the math as well.
              – Garth Fleming
              28 mins ago


















            • Thank you so much...this works great. I had fun reproducing the math as well.
              – Garth Fleming
              28 mins ago
















            Thank you so much...this works great. I had fun reproducing the math as well.
            – Garth Fleming
            28 mins ago




            Thank you so much...this works great. I had fun reproducing the math as well.
            – Garth Fleming
            28 mins ago










            up vote
            3
            down vote













            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}


            enter image description here






            share|improve this answer



























              up vote
              3
              down vote













              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}


              enter image description here






              share|improve this answer

























                up vote
                3
                down vote










                up vote
                3
                down vote









                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}


                enter image description here






                share|improve this answer














                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}


                enter image description here







                share|improve this answer














                share|improve this answer



                share|improve this answer








                edited 12 mins ago

























                answered 39 mins ago









                Herbert

                267k23406716




                267k23406716






























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