How do I put an arrow on the left end only? How do I put an arrow on both ends?

After all the examples shown to you above, is it really that hard to read documentation on Arrow and see examples there on exactly what you are asking? You have a complete control with option Arrowheads, which you could have found out if you would only make an effort to read the docs:

Plot[Sin[x], {x, 0, 2 Pi}] /.Line[x_] -> {Arrowheads[{-.1, .05}], Arrow[x]}

Set size parameter 0 to "remove" Arrowheads. Please invest effort in learning doc examples in future. Read the forum rules:

http://wolfr.am/READ-1ST

Hi Peter, it is not very clear what you want to achieve, do you have some code or sketch?

You may have a look at the free package CurvesGraphics6

I have seen this package put arrows in the middle. Can it put arrows only at one end or the other or both for any relation?

Graphics[Cases[Plot[Sin[x],{x,0,2Pi}],Line[x_]:>Arrow[Line[x]],\[Infinity]]]
Graphics[Cases[ParametricPlot[{Sin[u],Sin[2u]},{u,0,2Pi}],Line[x_]:>Arrow[Line[x]],\[Infinity]]]
Graphics[Cases[Plot[0.3x^2-1x,{x,-3,3}],Line[x_]:>Arrow[Line[x]],\[Infinity]]]
Graphics[Cases[Plot[{Sin[x],Sin[2x]},{x,0,2Pi}],Line[x_]:>Arrow[Line[x]],\[Infinity]]]

This will work for plot functions that do not produce GraphicsComplex objects: ParametricPlot with parametric curves, Plot, PolarPlot, et cetera...

These are examples. I used Snagit to capture the screen. I will use this arrow code in the free solution videos at eTutoring.com

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