graph with gap?

[River Huang]

Dear All, I draw the following graph,

clear

set obs 100

gen x = _n
gen c = 50
gen d = (x >= c)

twoway (line d x if x < 49.9) (line d x if x >= 50), ///
ylabel(#3) xline(50, lpattern(dash) noextend) xlabel(#10) legend(off)

The problem is that how can I fill the gap (as indicated by the red circle)? Thanks for your suggestions.

[William Lisowski]

Here's one approach.

clear

set obs 101

gen x = _n
gen c = 50
replace x = c-.00001 in 101
sort x
gen d = (x >= c)

twoway (line d x if x < 50) (line d x if x >= 50), ///
ylabel(#3) xline(50, lpattern(dash) noextend) xlabel(#10) legend(off)

[River Huang]

Hi William, Great and thank you.

[Nick Cox]

I'd mention also the use of twoway function for plotting deterministic functions.

[River Huang]

Hi, Nick, Many thanks for your instruction. I have the following code for the same/similar graph.

twoway function d = 0, range(0 50) || function d = 1, range(50 100) ///
ylabel(#3) xline(50, lpattern(dash) noextend) xlabel(#10) legend(off)