Way to programmatically draw lines on a two-way figure

[HP Williams]

Hello
I am trying to figure out if there is a way to draw a line from point (X1,Y1) to point (X2,Y2) when creating a two-way graph. I know I can make lines at a specific X or Y coordinate, but these lines continue the length of the graph window.
Is this possible without manually doing it with the graph editor?

thanks!

hp

[Clyde Schechter]

Here's a toy example of how to do this:

clear*
sysuse auto
gen x = 15 in 1
replace x = 30 in 2
gen y = 4500 in 1
replace y = 12000 in 2

graph twoway (scatter price mpg) (line y x)

[Andrew Musau]

help tw scatteri

sysuse auto, clear
tw scatter mpg weight||scatteri 30 2500 30 4000, recast(line)  lw(vthick) leg(off)

Res.:

[HP Williams]

amazing! thanks to both of you for the help!

[Nick Cox]

See also https://journals.sagepub.com/doi/pdf...6867X241276116 for a miniature review of adding extra lines to graphs.