[R] panel.rect and log scale in lattice plot

Ivan Krylov kry|ov@r00t @end|ng |rom gm@||@com
Wed Mar 23 11:33:52 CET 2022

On Wed, 23 Mar 2022 09:38:34 +0000
"Garbade, Sven via R-help" <r-help using r-project.org> wrote:

>            cpl <- current.panel.limits()

If you str() the return value of current.panel.limits() from the panel
function with log-scaling enabled, you can see that it contains the
logarithm of the y-values, as do the y values themselves. This is
consistent with ?xyplot saying:

>> Note that this is in reality a transformation of the data, not the
>> axes. Other than the axis labeling, using this feature is no
>> different than transforming the data in the formula; e.g.,
>> ‘scales=list(x = list(log = 2))’ is equivalent to ‘y ~ log2(x)’.

...although it could be more explicit.

If you take a logarithm of 10 and 500, lrect() should be able to
produce a rectangle in the right place.

Best regards,

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