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

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Andy
Andy 2014-10-25
评论： Star Strider 2014-10-25
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);

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Star Strider
Star Strider 2014-10-25
Try this:
text(5/7, 6/9, str);
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