Hi H,
Looking at your example and the help page, it looks to me as though
the plot is consistent with the "A" matrix:
Oz
Rain Nice
Rain 0.25 0.75
Nice 0.60 0.40
# help page
A - square coefficient matrix, specifying the links (rows=to, cols=from).
In your plot (attached):
Rain (col) goes to Rain (row) 0.25
Rain (col) goes to Nice (row) 0.6
Nice (col) goes to Nice (row) 0.4
Nice (col) goes to Rain (row) 0.75
This is a bit confusing, but it seems to do what it says it does.
Jim
On Thu, Sep 16, 2021 at 10:40 AM H <age...@meddatainc.com> wrote:
>
> I am using plotmat 1.6.5 (part of the diagram package) in R 3.6 to plot
> Markov transition charts but have run into an issue that I was hoping someone
> could shed light on here. I did e-mail the maintainer over a month ago but
> have not received a reply.
>
> The issue is that the directional arrows point in the wrong direction. A
> brief example:
>
> stateNames <- c("Rain", "Nice")
> Oz <- matrix(c(0.25, 0.75, 0.6, 0.4), nrow = 2, byrow = TRUE)
> rownames(Oz) <- stateNames; colnames(Oz) <- stateNames
> plotmat(Oz, pos = c(1, 1), lwd = 1, box.lwd = 2, cex.txt = 0.8, box.size =
> 0.1, box.type = "circle", box.prop = 0.5, box.col = "light yellow",
> arr.length = 0.2, arr.width = 0.2, self.cex = 0.4, self.shifty = 0.01,
> self.shiftx = 0.13, main = "")
>
> In the above example both arrows seem to point in the direction opposite to
> what I expect. Has anyone encountered this and know how to fix it?
>
> Thanks.
>
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