# Create a parametric plot, with only positive axes - stability diagram?

GROUPS:
 Hello everyone!I started using Mathematica today (have only a little bit OF Matlab experience).I got the following code: r[x_]= 2x / (x^2+1)^2; s[x_] = (x^2 (-1+x^2))/(1+x^2)^2; ParametricPlot[{r[x],-s[x]}, {x,0,10}, PlotStyle -> {Blue}, AxesLabel->{Style[r,Large],Style[s,Large]},LabelStyle->Directive[Bold]] My task seems to be quite easy, but I fail: I want to get this plot, but only with positive s-axis - no negative s-values needed.Can anybody help me, please?Thank you so much!
1 year ago
3 Replies
 Look up PlotRange in docs: http://reference.wolfram.com/language/ref/PlotRange.htmlMake it a habit to read docs carefully. If you would carefully read ParametricPlot docs you would find examples there that solves your problem.
1 year ago
 I allready looked up PlotRange and tried out a lot, but I was not able to get it working.I now tried some things and fixed the Problem with ... ParametricPlot[{r[x],-s[x]}, {x,0,**1**},... even though I mathematically don't understand what I did... how would ich have to arrange the "PlotRange"?
1 year ago
 (Click "Reply" to reply to a specific comment to have comments structured). Something like this? r[x_] = 2 x/(x^2 + 1)^2; s[x_] = (x^2 (-1 + x^2))/(1 + x^2)^2; ParametricPlot[{r[x], -s[x]}, {x, 0, 10}, PlotStyle -> {Blue}, FrameLabel -> {Style[r, Large], Style[s, Large]}, LabelStyle -> Directive[Bold], PlotRange -> {Automatic, {0, .13}}, AspectRatio -> 1, PlotTheme -> "Detailed"]