Insert text in a specific location of a graph

问题

I have two functions y=5*x+3 and y=8*x+2.

After i type the command:

graph twoway (function y=5*x+3) (function y=8*x+2)

I can use the graphics editor to write text near the intersection of the two lines.

However, I would not like to do this all the time.

Is there a way to create the graph with the text without adding it later?

回答1:

There is a text option for the graph twoway command that does this.

First, you obviously need to solve for x and then get the value of y:

5x + 3 = 8x + 2
x = (-3 + 2) / -3
x = 0.333

y = 8 * 0.333 + 2
y = 4.664

With both coordinates at hand, you just need to add the textbox in your twoway command:

twoway (function y=5*x+3) (function y=8*x+2), text(4.664 0.333 "Intersection", placement(11))

See added text options in the Stata manual for more details.

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EDIT:

Alternatively, you could also use a marker:

twoway (function y=5*x+3) (function y=8*x+2) (scatteri 4.664 0.333 (11) "Intersection")

The entry on graph twoway scatteri in the Stata manual provides additional information.

来源：https://stackoverflow.com/questions/51987747/insert-text-in-a-specific-location-of-a-graph