Repetitive anotation in plot

I've got this code and I want it to show the position in x and y and other things but the problem is that it show the string 'Distancia Horizontal' and 'Distancia Vertical' correctly but it repeats the values of x and y, i.e. they accumulate.

while n<100
    n = n + 1
    t = 0:n
    x=((vi*cos(angulo))/b)*(1-(e.^(-b*t)));
    y=((1/b)*((g/b)+vi*sin(angulo))*(1-e.^(-b*t))-((g/b)*t))+altura;
    hold on
    plot(x,y)
    title('Simulacion proyectiles Popocatepetl');
    xlabel('Distancia Horizontal (m)');    
    ylabel('Distancia Vertical (m)');  
    str = {'Posicion en X' x,'Posicion en Y' y};
    dim = [.2 .5 .3 .3];
    delete(a)
    a=annotation('textbox',dim,'String',str,'FitBoxToText','on');
    drawnow;
    pause(1)
    grid on 
    
    if y<0
        n=0
    end    
end

And the message:

[Walter Roberson]

    t = 0:n

so t is a vector.

    x=((vi*cos(angulo))/b)*(1-(e.^(-b*t)));
    y=((1/b)*((g/b)+vi*sin(angulo))*(1-e.^(-b*t))-((g/b)*t))+altura;

x and y are defined in terms of the vector t, so x and y will be vectors.

    while n<100
    n = n + 1
    t = 0:n

n is increasing, so 0:n is increasing. So your x and y vectors are going to get larger, so your annotations are going to get larger.

Perhaps you want

        str = {'Posicion en X' x(end), 'Posicion en Y', y(end)};

Answer 1

[Image Analyst]

Try making x and y into strings. Or else just use sprintf() to build the whole string

str = sprintf('Posicion en X = %.3f, Posicion en Y = %.3f', x(end),  y(end));

If you want them on separate lines, put in a backslash n:

str = sprintf('Posicion en X = %.3f\nPosicion en Y = %.3f', x(end),  y(end));

[Alejandro Castro]

Thank you so much for your answer