[R] Drawing Tangent

[Martin Maechler]

>>>>> "Arun" == Arun Kumar Saha <arun.kumar.saha at gmail.com>
>>>>>     on Thu, 26 Apr 2007 23:44:03 +0530 writes:

    Arun> Dear all R-users,
    Arun> I would like to draw a tangent of a given function for a particular (given)
    Arun> point. However the straight line representing it should not cut any axis, it
    Arun> should be a small line. Can anyone tell me how to do this?

You will eventually call segments() to draw that short line.

par("usr") {and maybe e.g. par("pin")} will probably be relevant when
determining how long the line segment(s) should be.

Martin Maechler, ETH Zurich