Mark points with a value in a MATLAB plot

Question

The following command does mark the points with a square, but it does not put a value in (for example, (21,0), ...).

X = [21 8 2 1 0]

Y = [0 1 2 3 4]

plot(X,Y,'k-s')

Which parameter should I add so all 5 point values come on the plot?

The values can't be typed one by one as they can change, because they are random numbers.

Answer 1

You can display text on your plot by using the functions NUM2STR, CELLSTR, and STRTRIM to format the coordinate values into a cell array of strings and using the function TEXT to display them:

strValues = strtrim(cellstr(num2str([X(:) Y(:)],'(%d,%d)')));
text(X,Y,strValues,'VerticalAlignment','bottom');

And your plot will look like this for the sample data above: