Re: [R] [ggplot] trouble with ggabline and log-log-plots

From: hadley wickham <h.wickham_at_gmail.com>
Date: Tue 24 Oct 2006 - 22:49:10 GMT

> Well, my data does not start at 0 either (no log-log plot starts at 0).
> I think the line should start where the data-points start at. So, one
> can should be able to get this from the range where the values are
> plotted.

Yes, but for abline (the way it is currently written) to work out where that line should go, uses the equation y = mx + c. In this case, where c = 0, or -infinity on the log scale, y is going to be -infinty for the entire range of x's. I don't see how to interpret the specification in a consistent manner otherwise.

> I wrote some functions which do produce nice tick-marks with
> lattice-plots, but the syntax is really messy. However, my functions can
> produce lists with at and label members with according ticks. If you
> like, I sent them to you along with an example plot.

Yes, I'd like to see them. If the algorithm is good, I'm happy to clean up the code and include it.

Regards,

Hadley



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