R help - May 2009 - Lattice scales question: using "at" when log = TRUE

All,

I have a simple lattice plot where I have set log = TRUE for the y scale.

When I attempt to change the tick locations via the "at" argument
within
scales, the supplied numeric vector is not followed. Any suggestions much
appreciated for the example below:

y = c(10^1.5, 10^2, 10^3, 10^2)
t = c(1,2,3,4)
xyplot(y ~ t, type = "b", scales = list(y = list(log = TRUE)))

## tick marks not followed for supplied marks below:
xyplot(y ~ t, type = "b", scales = list(y = list(log = TRUE), at =
c(10^1,
10^2, 10^2.5, 10^3)))

Cheers,
David

PS - 
Another thing is that the scale is no longer in scientific notations, but
that is okay since this can be fixed via the labels argument within scales:
e.g., labels = c(expression(10^1), expression(10^2), ...)
An example of fancy labels for log axes is on p.147 of Deepayan's Lattice
book.

Your parentheses are wrong.  It should be

y = list(log = TRUE, at = ...)


On Sat, May 16, 2009 at 5:11 PM, Afshartous, David
<DAfshartous at med.miami.edu> wrote:
>
> All,
>
> I have a simple lattice plot where I have set log = TRUE for the y scale.
>
> When I attempt to change the tick locations via the "at" argument
within
> scales, the supplied numeric vector is not followed. Any suggestions much
> appreciated for the example below:
>
> y = c(10^1.5, 10^2, 10^3, 10^2)
> t = c(1,2,3,4)
> xyplot(y ~ t, type = "b", scales = list(y = list(log = TRUE)))
>
> ## tick marks not followed for supplied marks below:
> xyplot(y ~ t, type = "b", scales = list(y = list(log = TRUE), at
= c(10^1,
> 10^2, 10^2.5, 10^3)))
>
> Cheers,
> David
>
> PS -
> Another thing is that the scale is no longer in scientific notations, but
> that is okay since this can be fixed via the labels argument within scales:
> e.g., labels = c(expression(10^1), expression(10^2), ...)
> An example of fancy labels for log axes is on p.147 of Deepayan's
Lattice
> book.
>
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