R devel - May 1997 - R-alpha: abline not recognized coef member of list

Hello, R developers.

  I found a little different behavior of R with S.

  at R-0.49:
    > a
    [1] 12 23 22 34 44 54 55 70 78
    > plot(a)
    > abline(lsfit(seq(1,len=length(a)), a))
    Error: no applicable method for "coefficients"

  at S (from AT&T '92) result draw coefficient line without error.
Then I think to need define a function as followed:

    coefficients.default <- function(x) x$coef

---
Nobuhiro Yasutomi, ISAC, Inc.
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