Draw vertical and horizontal reference lines
First you should set the axis limits, then plot the lines. Here's a demo
figure
point = [0.7, 0.5]; % Here the point that will have the reference lines
axLims = [0 1 -2 2]; %[x-min, x-max, y-min, y-max] axis limits
plot(point(1), point(2), 'o')
xlim(axLims(1:2));
ylim(axLims(3:4));
hold on
plot([point(1), point(1)], [axLims(3), point(2)], 'k-') %vertical line
plot([axLims(1), point(1)], [point(2), point(2)], 'k-') %horizontal line
Display coordinates of point
text(axLims(1), axLims(3), sprintf('point (%.2f, %.2f)', point), 'HorizontalAlignment', 'Left', 'VerticalAlignment', 'Bottom')
