Math Forum Discussions

Themis Matsoukas

Posts: 284
From: Penn State
Registered: 6/20/10

Re: Labelling each curve and changing grid in ParametricPlot
Posted: Feb 3, 2013 2:49 AM

Plain Text

Here is one way to label the curves:

plot[\[Tau]_, \[CapitalOmega]_] :=
Module[{arg, abs}, {arg, abs} =
Through[{Arg,
Abs}[(1 + I*2*\[CapitalOmega])/(1 +
I*2*\[Tau]*\[CapitalOmega])]];
{arg/Degree, 20*Log10[abs]}]

\[Tau]list = {7, 8, 9, 10, 11, 12, 13, 14, 15};

txtlist =
Table[plot[\[Tau], \[CapitalOmega]], {\[Tau], \[Tau]list}] /. \
\[CapitalOmega] -> -0.52;

Show[ParametricPlot[
Table[plot[\[Tau], \[CapitalOmega]], {\[Tau], \[Tau]list}], {\
\[CapitalOmega], -0.5, -0.01}, AspectRatio -> 1,
GridLines -> Automatic, GridLinesStyle -> Dashed,
ImageSize -> Large],
Graphics[Table[
Text[\[Tau]list[[ii]], txtlist[[ii]]], {ii,
1, \[Tau]list // Length}]]]

I am not sure what exactly you want to do with the grid but you can specify your own regular or irregular grid using the option GridLines. See the examples in documentation.

Themis