Thanks for tracking this down.

Andrew

On Mon, Jun 16, 2008 at 4:49 PM, Peter Dalgaard <p.dalgaard@biostat.ku.dk>
wrote:

> Andrew Yee wrote:
>
>> I've been trying to figure out a parameter that will let you separately
>> adjust the parameters for the axis line from the tick mark.
>>
>> In the following example, I would like to suppress the axis line, but keep
>> the tick marks.
>>
>>
> The source code is the ultimate reference. We have in do_axis in
> src/main/plot.c:
>
>   if (doticks) {
>       gpptr(dd)->col = col;/*was fg */
>       GLine(axis_low, axis_base, axis_high, axis_base, NFC, dd);
>       for (i = 0; i < n; i++) {
>           x = REAL(at)[i];
>           if (low <= x && x <= high) {
>               x = GConvertX(x, USER, NFC, dd);
>               GLine(x, axis_base, x, axis_tick, NFC, dd);
>           }
>       }
>   }
>
> and, as you see, there is no way the line parameters can change between the
> GLine calls, no hope of finding a magical par() setting. So I'm afraid you
> have to bite the bullet, do the relevant coordinate calculations, and use
> segments() do draw the ticks. (Or try convincing Paul Murrell to change the
> design, but that takes longer...).
>
> --
>  O__  ---- Peter Dalgaard             Øster Farimagsgade 5, Entr.B
>  c/ /'_ --- Dept. of Biostatistics     PO Box 2099, 1014 Cph. K
> (*) \(*) -- University of Copenhagen   Denmark      Ph:  (+45) 35327918
> ~~~~~~~~~~ - (p.dalgaard@biostat.ku.dk)              FAX: (+45) 35327907
>
>

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