[R] draw with plotrix

[Jim Lemon]

Hi Luigi,
Try this:

brkdn.plot(y~x+z,data=Q)

Jim

On Thu, Aug 27, 2020 at 9:57 PM Luigi Marongiu <marongiu.luigi using gmail.com> wrote:
>
> Hello,
> I have a dataframe as follows
> ```
> x = c(rep("1000 pmol", 2), rep("100 pmol", 2), rep("10 pmol", 2),
> rep("0 pmol", 2))
> y = c(2.7642, 2.8192, 2.1976, 2.2816, 1.8929, 1.8883, 1.0051, 0.8561)
> z = c(rep("Sample",6), rep("Control", 2))
> Q = data.frame(x, y, z, stringsAsFactors = FALSE)
> ```
> I am trying to use plotrix to draw y broke down by x and differentiate
> the markers by z, but I get:
> ```
> > brkdn.plot(
> +   y, groups=x, obs=z,
> +   data=Q, mct="mean", md="std.error",
> +   stagger=NA, dispbar=TRUE,
> +   type="p", pch=16,
> +   main="Measurement",
> +   xlab=expression(bold("Amount of probe")),
> +   ylab=expression(bold("Optical density"))
> + )
> Error in .subset2(x, i, exact = exact) : no such index at level 1
>
> ```
> and similar with other combinations (`obs = x`...).
> What is the correct syntax?
> Thank you
>
>
> --
> Best regards,
> Luigi
>
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