[R] How to draw plot marks without label?

Luigi Marongiu m@rong|u@|u|g| @end|ng |rom gm@||@com
Wed Sep 6 07:38:54 CEST 2023

Thank you that is exactly it.
I know these are basic questions but I can't find the solution on
either manuals or online...
Best regards

On Tue, Sep 5, 2023 at 11:33 PM Bert Gunter <bgunter.4567 using gmail.com> wrote:
> Luigi:
> For base R graphics, you should always consult ?par for optional graphical parameters when the high level graphics function doesn't appear to provide the control you would like. I don't use base graphics -- i.e. i"m not particularly facile with it -- but as you provided an example, I decided to try to help. I think this is what you may want:
> stripchart(
>            Y ~ X, data = df,  ## better way to specify data  instead of $
>            method = "jitter", offset=1/3,
>            vertical = TRUE, las=1,
>            pch=16, cex=2,
>            ylab="Y", xlab="X",
>            yaxt= "n",  ## don't plot y axes
>            main="Example")
> ## Now add y axis on right with default tick mark locations
> axis(side = 4, labels = FALSE)
> How I got this (you may find this useful to modify the above if I didn't get what you wanted) was as follows:
> stripchart() does not seem to allow the direct control over the axes you want. The 'axes' parameter help in ?stripchart sent me to?par to see if I could specify an axis on the right instead of on the left, but it did not seem to provide such an option. So I decided to use what the yaxt parameter described to omit the y axis in the high level (stripchart) call, and then add it back with a subsequent call to axis(). I just used default tick locations in that call, but you can specify them explicitly as ?axis describes
> Again, if this is not what you wanted, I hope you can use the above to modify stripchart() to your desired specification.
> Cheers,
> Bert
> On Tue, Sep 5, 2023 at 12:57 PM Luigi Marongiu <marongiu.luigi using gmail.com> wrote:
>> I would like to draw a graph where the y-lables are missing but the
>> marks still present.
>> In this example, I get marks from 20000 to 140 000 with increments of
>> 20 000. I could use `plot(... yaxt="n"...)` combined with `axis(2,
>> at..., label="")` but this needs to know exactly the sequence of marks
>> provided by plot. But this sequence might change.
>> Thus is there a way to plot the marks without labels?
>> Also, is it possible to draw the marks on the right side?
>> Thank you.
>> ```
>> y = c(42008, 19076, 150576, 48192, 26153, 37931, 36103, 17692,
>>       61538,41027, 71052, 94571)
>> df = data.frame(X = c(rep(0, 6), rep(25, 6)), Y = y)
>> stripchart(df$Y ~ df$X,
>>            method = "jitter", offset=1/3,
>>            vertical = TRUE, las=1,
>>            pch=16, cex=2,
>>            ylab="Y", xlab="X",
>>            main="Example")
>> ```
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Best regards,

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