MATLAB: Displaying time on plot

display timeon plot

Hi Does anyone know how to display points time on plot? I have 15 points(15 x and 15 y) and 15 different years(1980,1982,1983,…) corresponding to the points. I can plot the point like plot(x,y,'.r').How I may display the years of each point on plot?

Thanks a lot!

Best Answer

Use the text() function. There are a number of date and time functions that you might want to use in conjunction with sprintf() to create a string to display on your graph at some (x,y) location with text().

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MATLAB: Displaying the radius on the plot

I am not quite certain what you want.

The Code —

t = linspace(0, 2*pi);
r = [1.5; 2];                                           % Radius
ctr = [0.5; 0.2];                                       % Circle Center
x = [r*cos(t) + ctr(1)]';
y = [r*sin(t) + ctr(2)]';
figure
plot(x, y)
hold on
plot([1 1]*ctr(1), [1 1]*ctr(2),'+r')                    % Plot Center
plot([ctr(1) x(20,1)], [ctr(2) y(20,1)],'-b')
plot([ctr(1) x(40,2)], [ctr(2) y(40,2)],'-r')
hold off
axis equal
axis([ -3  3    -3  3])
text(x(20,1), y(20,1), '$R\ =\ 1.5$','Interpreter','latex')
text(x(40,2), y(40,2), '$R\ =\ 2.0$','Interpreter','latex')

The Plot —

This draws the radii and labels them.

Experiment to get the result you want.

MATLAB: Show time labels on points in a quiver plot (inside the plot)

I don't think quiver has any built-in labeling capabilities, but you could manually add text to any location(s) with text(x,y,'text string'). Here's an example with several text labels:

x = 1:3; 
y = [5 2 7]; 
strings = {'string 1';'string 2';'string 3'}; 
plot(x,y,'r.')
axis([0 4 1 8])
text(x,y,strings)

Best Answer

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MATLAB: Displaying the radius on the plot

MATLAB: Show time labels on points in a quiver plot (inside the plot)

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