Dear Sirs,

I am a new user of the R package.  When I try to use the curve function it
confuses me.

> curve(x^2)
Works fine.

> curve(x)
Makes a complaint I don't understand.  Why is x^2 valid and x is not?

I check the documentation of curve, and it says the first argument must be
an expression containing x.

> expression(x)
Is an expression containing x.

> curve(expression(x))
Makes a different complaint and mentions different lengths of x and y (but I
use no y here).

I understand that plotting the function y(x) = x is rather silly, but I want
to know what I am doing wrong, for the sake of my understanding of how R
works.

Thank you for support.
Abhilash B.

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