# How to show the directions (arrows in the graph) for a ParametricPlot [duplicate]

f[t_] := 2*t - 3;
f1[t_] := 6*t - 7;
ParametricPlot[{f[t], f1[t]}, {t, -3, 3}]


The above code shows the graph... but it can't show me the directions. How can this be achieved?

## marked as duplicate by J. M. is away♦Dec 14 '15 at 11:05

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• – user9660 Dec 14 '15 at 8:58

One way to post-process your plot (caveat: will probably not work for any combination):

f[t_] := 2*t - 3; f1[t_] := 6*t - 7;
ParametricPlot[{f[t], f1[t]}, {t, -3, 3}] /.  Line[content___] :> {Arrowheads[ConstantArray[0.05, 5]], Arrow[content]}


• Thnx....to you. – Nasim Dec 14 '15 at 9:14

This question may get marked as a duplicate, there are many question about adding arrows to plots, but none of them has an answer of how to programmatically add an arrow for a parametric plot. For that answer, I looked to this post on Wolfram Community,

arrowParametricPlot[f_List, p_List, opts : OptionsPattern[]] :=
Block[{δ = (p[[3]] - p[[2]])/100.},
ParametricPlot[f, p,
Evaluate[FilterRules[{opts}, Options[ParametricPlot]]],

{arrowParametricPlot[{f[t], f1[t]}, {t, -3, 3}, ImageSize -> 100],