How can I use the text and sprintf functions to label a point on a graph?

I need to label a point with its coordinates (x = 5/6, y = 6/9) correct to 4 decimal places. The line y consists of one plot, hence the (x, y, str). When I try the following code no label appears on my graph.

x = 5/7:5/7;
y = % equation of line
plot(x, y);
str = sprintf('%0.4', 5/7, 6/9);
text(x, y, str);

Answer 1

[Star Strider]

Try this:

text(5/7, 6/9, str);

[Andy]

Still doesn't work

[Star Strider]

I didn’t catch the fact that in your assignment of x you are plotting a point rather than a line. You also omitted the ‘f’ format descriptor in your sprintf call.

I supplied my own equation, and this works:

x = 0:2;                        % Define Line
y = 2*x - 3;
plot(x, y);
str = sprintf(' %0.4f ', 5/7, 6/9);
text(5/7, 6/9, str);

[Andy]

Whoops. I added the 'f', works now. Thank you very much

[Star Strider]

My pleasure!

It happens to us all...