Hi Deepayan,

Thanks for the reply, but when I enter the " type = "b" " code into the 
auto.key
(see below) command I get the following message:

Error in valid.pch(x$pch) : zero-length 'pch'

Any suggestions?

xyplot(
        #basic settings
        bias ~ sample_size | measure,
        data = bias,
        groups = exp_tau,
        type = "b",
        pch = c(1,2,3,4,5),
        xlab = "Sample Size",
        ylab = "Bias (ms)",
        #make strips transparent
        strip = function(bg, ...) strip.default(bg = 'transparent', ...),
        # tweak scales
        scales=list(
                x=list(
                        at = c(20, 40, 60),
                        tck = c(1,0),
                        alternating = F
                ),
                y=list(
                        at = c(-50, -25, 0, 25, 50),
                        tck = c(1,0),
                        alternating = F
                )
        ),
        # tell key to match symbols to those used in the plot
        par.settings = list(
                superpose.symbol = list(
                        cex = .8,
                        pch = c(1,2,3,4,5)
                )
        ),
        # key settings
        auto.key = list (
                type = "b",
                lines = T,
                border = T,
                cex.title = 1.2,
                title = "Expected Tau",
                text = c("30 ms", "80 ms", "130 ms", "180 ms", "230 ms"),
                space = "right"
        )
)


Quoting Deepayan Sarkar <[EMAIL PROTECTED]>:

> On 7/30/05, Mike Lawrence <[EMAIL PROTECTED]> wrote:
>> Quick correction:
>>
>> The lines "lines = T," & "type = "b"" in the "par.settings" section should
>> not
>> be there. They are remnants of my previous (failed) attempts at solving the
>> problem. Below is the correct code:
>>
>> xyplot(
>>      #basic settings
>>      bias ~ sample_size | measure,
>>      data = bias,
>>      groups = exp_tau,
>>      type = "b",
>>      pch = c(1,2,3,4,5),
>>      #make strips transparent
>>      strip = function(bg, ...) strip.default(bg = 'transparent', ...),
>>      # tweak scales
>>      scales=list(
>>              x=list(
>>                      at = c(20, 40, 60),
>>                      tck = c(1,0),
>>                      alternating = F
>>              ),
>>              y=list(
>>                      at = c(-50, -25, 0, 25, 50),
>>                      tck = c(1,0),
>>                      alternating = F
>>              )
>>      ),
>>      # tell key to match symbols to those used in the plot
>>      par.settings = list(
>>              superpose.symbol = list(
>>                      cex = .8,
>>                      pch = c(1,2,3,4,5)
>>              )
>>      ),
>>      # key settings
>>      auto.key = list (
>>              lines = T,
>>              size = 7,
>
> You seem to be missing a 'type="b"' somewhere here. The type="b"
> argument to xyplot is actually handled by the panel function. The key
> has type="l" by default (see under 'key' in ?xyplot) and has to be
> changed explicitly.
>
>>              border = T,
>>              cex.title = 1.2,
>>              title = "Expected Tau",
>>              text = c("30 ms", "80 ms", "130 ms", "180 ms", "230 ms"),
>>              space = "right",
>>      )
>> )
>>
>>
>>
>> Quoting Mike Lawrence <[EMAIL PROTECTED]>:
>>
>> > Hi all,
>> >
>> > I'm having a problem with the auto.key function in xyplot. I hate to
>> > bother the
>> > list like this and I'm positive I must be missing something very simple,
>> yet
>> > I've spent the last day searching for a solution to no avail.
>> >
>> > Essentially, I want a key that contains entries in which the plot points
>> are
>> > superimposed on a line of the same color as the points, like this:
>> o--o--o
>> > Now, given the presence of the default "divide" command, I assume this is
>> > simple; indeed, I get the impression that this representation is
>> > supposed to be
>> > produced automatically. Yet I can't seem to get it to work!
>> >
>> > Now, I've incorporated various other tweaks to my xyplot function, so I'm
>> > wondering if these tweaks are somehow hindering my efforts. The function
>> is
>> > pasted below; I am making a 3x3 plot, each panel contains 5 lines and it
>> is
>> > these lines that I want represented in the key. See the comments for
>> > descriptions of the modifications.
>> >
>> > Any help would be greatly appreciated.
>> >
>> > Cheers,
>> >
>> > Mike
>> >
>> >
>> > xyplot(
>> >    #basic settings
>> >    bias ~ sample_size | measure,
>> >    data = bias,
>> >    groups = exp_tau,
>> >    type = "b",
>> >    pch = c(1,2,3,4,5),
>> >    #make strips transparent
>> >    strip = function(bg, ...) strip.default(bg = 'transparent', ...),
>> >    # tweak scales
>> >    scales=list(
>> >            x=list(
>> >                    at = c(20, 40, 60),
>> >                    tck = c(1,0),
>> >                    alternating = F
>> >            ),
>> >            y=list(
>> >                    at = c(-50, -25, 0, 25, 50),
>> >                    tck = c(1,0),
>> >                    alternating = F
>> >            )
>> >    ),
>> >    # tell key to match symbols to those used in the plot
>> >    par.settings = list(
>> >            superpose.symbol = list(
>> >                    cex = .8,
>> >                    pch = c(1,2,3,4,5)
>> >            ),
>> >            lines = T,
>> >            type = "b"
>> >    ),
>> >    # key settings
>> >    auto.key = list (
>> >            lines = T,
>> >            size = 7,
>> >            border = T,
>> >            cex.title = 1.2,
>> >            title = "Expected Tau",
>> >            text = c("30 ms", "80 ms", "130 ms", "180 ms", "230 ms"),
>> >            space = "right",
>> >    )
>> > )
>> >
>> >
>> >
>> > --
>> >
>> > Mike Lawrence, BA(Hons)
>> > Research Assistant to Dr. Gail Eskes
>> > Dalhousie University & QEII Health Sciences Centre (Psychiatry)
>> >
>> > [EMAIL PROTECTED]
>> >
>> > "The road to Wisdom? Well, it's plain and simple to express:
>> > Err and err and err again, but less and less and less."
>> > - Piet Hein
>> >
>> > ______________________________________________
>> > [email protected] mailing list
>> > https://stat.ethz.ch/mailman/listinfo/r-help
>> > PLEASE do read the posting guide!
>> http://www.R-project.org/posting-guide.html
>> >
>>
>>
>>
>> --
>>
>> Mike Lawrence, BA(Hons)
>> Research Assistant to Dr. Gail Eskes
>> Dalhousie University & QEII Health Sciences Centre (Psychiatry)
>>
>> [EMAIL PROTECTED]
>>
>> "The road to Wisdom? Well, it's plain and simple to express:
>> Err and err and err again, but less and less and less."
>> - Piet Hein
>>
>> ______________________________________________
>> [email protected] mailing list
>> https://stat.ethz.ch/mailman/listinfo/r-help
>> PLEASE do read the posting guide!
>> http://www.R-project.org/posting-guide.html
>>
>



-- 

Mike Lawrence, BA(Hons)
Research Assistant to Dr. Gail Eskes
Dalhousie University & QEII Health Sciences Centre (Psychiatry)

[EMAIL PROTECTED]

"The road to Wisdom? Well, it's plain and simple to express:
Err and err and err again, but less and less and less."
- Piet Hein

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