How to graph a logistic equation using tikz
up vote
4
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}
tikz-pgf
asked Dec 11 at 6:12
Garth Fleming
37218
add a comment |
up vote
4
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}
tikz-pgf
asked Dec 11 at 6:12
Garth Fleming
37218
add a comment |
up vote
4
down vote
favorite
up vote
4
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}
tikz-pgf
asked Dec 11 at 6:12
Garth Fleming
37218
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
tikz-pgf
asked Dec 11 at 6:12
Garth Fleming
37218
asked Dec 11 at 6:12
Garth Fleming
37218
edited Dec 11 at 6:30
asked Dec 11 at 6:12
Garth Fleming
37218
asked Dec 11 at 6:12
Garth Fleming
37218
asked Dec 11 at 6:12
Garth Fleming
37218
37218
add a comment |
add a comment |
2 Answers
2
active
oldest
votes
up vote
7
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}
answered Dec 11 at 6:34
nidhin
3,279927
1
Thank you so much...this works great. I had fun reproducing the math as well.
– Garth Fleming
Dec 11 at 7:03
add a comment |
up vote
6
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}
answered Dec 11 at 6:52
Herbert
267k23407716
add a comment |
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2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
up vote
7
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}
answered Dec 11 at 6:34
nidhin
3,279927
1
Thank you so much...this works great. I had fun reproducing the math as well.
– Garth Fleming
Dec 11 at 7:03
add a comment |
up vote
7
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}
answered Dec 11 at 6:34
nidhin
3,279927
1
Thank you so much...this works great. I had fun reproducing the math as well.
– Garth Fleming
Dec 11 at 7:03
add a comment |
up vote
7
down vote
accepted
up vote
7
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}
answered Dec 11 at 6:34
nidhin
3,279927
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}
answered Dec 11 at 6:34
nidhin
3,279927
answered Dec 11 at 6:34
nidhin
3,279927
answered Dec 11 at 6:34
nidhin
3,279927
answered Dec 11 at 6:34
nidhin
3,279927
3,279927
1
Thank you so much...this works great. I had fun reproducing the math as well.
– Garth Fleming
Dec 11 at 7:03
add a comment |
1
Thank you so much...this works great. I had fun reproducing the math as well.
– Garth Fleming
Dec 11 at 7:03
1
1
Thank you so much...this works great. I had fun reproducing the math as well.
– Garth Fleming
Dec 11 at 7:03
Thank you so much...this works great. I had fun reproducing the math as well.
– Garth Fleming
Dec 11 at 7:03
add a comment |
up vote
6
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}
answered Dec 11 at 6:52
Herbert
267k23407716
add a comment |
up vote
6
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}
answered Dec 11 at 6:52
Herbert
267k23407716
add a comment |
up vote
6
down vote
up vote
6
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}
answered Dec 11 at 6:52
Herbert
267k23407716
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}
answered Dec 11 at 6:52
Herbert
267k23407716
edited Dec 11 at 7:19
answered Dec 11 at 6:52
Herbert
267k23407716
answered Dec 11 at 6:52
Herbert
267k23407716
answered Dec 11 at 6:52
Herbert
267k23407716
267k23407716
add a comment |
add a comment |
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