marker label values in twoway mata

[Niels Henrik Bruun]

Hi
When I run the code

sysuse auto, clear
summarize price
mata:
    mean = st_numscalar("r(mean)")
    sd = st_numscalar("r(sd)")
    p = st_data(., "price")
    R = st_nobs()
    plot_m = sort( (p, (1::R)), 1), mean :+ sd :* invnormal( (1::R) :/ (R+1))
    m = plot_m[., (1,3)]
    mlbl = plot_m[., 2]
end
twoway (scatter matamatrix(m)) (function y=x, range(price)) , legend(off)

I get a nice (Q-Q) graph



However, I would like to add marker labels in the scatter plot.
But I can't. I've tried eg.

. twoway (scatter matamatrix(m), mlabel(matamatrix(mlbl))) (function y=x, range(price)) , legend(off)
option mlabels() not allowed
r(198);

Is there a way of getting marker labels onto the scatter points?

[William Lisowski]

This seems to be a start at what you want.

sysuse auto, clear
summarize price
mata:
    mean = st_numscalar("r(mean)")
    sd = st_numscalar("r(sd)")
    p = st_data(., "price")
    R = st_nobs()
    plot_m = sort( (p, (1::R)), 1), mean :+ sd :* invnormal( (1::R) :/ (R+1))
end
getmata (y mlbl x) = plot_m
twoway (scatter y x, mlabels(mlbl)) (function y=x, range(price)) , legend(off)

[Niels Henrik Bruun]

William Lisowski Thank you very much.
I'd forgot -putmatrix-, so this is a very nice solution

Although I had hoped I would have been able to use matamatrix

[William Lisowski]

Niels Henrik Bruun You came close, farther than I would have. Since the output of help twoway scatter suggests that the arguments are variable names and yet you were able to successfully pass it a matrix that it interpreted correctly, I'd say you exploited an undocumented feature that I'll keep in mind for future reference. But apparently your luck ran out at the mlabels() option, which reacted unfavorably to a matrix name as an argument and issue the sort of error message we often see when Stata encounters something it never imagined it would.