Hi,

I am trying to get R to return just the slope of a linear regression line,
but it seems that R has to return both the slope and the name of the slope.
For example,

> a=coef(lm(y~miles))
> a
(Intercept)       miles
   360.3778     -7.2875
> names(a)
[1] "(Intercept)" "miles"
> a[1]
(Intercept)
   360.3778
> a[2]
  miles
-7.2875

I don't understand the data structure that's returned from coef(). names(a)
seems to suggest that coef() returns two columns of data, column one is the
Intercept, and column two miles. But R keeps telling me that the return
value from coef() has only one dimension, i.e., a[,2] doesn't work, but a[2]
works. However, a[2] contains more than the slope, it also has the name of
the slope. Does anyone know how to access just the slope without its name?

Thanks,

Tom

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