How to print changing y value on plot using the "COMET" function

For the following code I am trying to print the y value as a function of time on the plot itself (shown here is a damped sine wave function). However, the value is not printing. Many thanks in advance for any help.

x = linspace(0,5,250);
for k = 2:length(x)
    
    y = exp(-350.*x).*25.*cos(4.*x)+200;
    
    ax = axes;
    set(ax, 'xlim', [0 3], 'ylim', [150 300]);
    
    hold(ax);
    
    comet(ax,x,y)
    
    txt = num2str(y);                    %%%%%%ISSUE CODE
    text(2.15,275,sprintf('%d',txt))     %%%%%%ISSUE CODE
   
end

Answer 1

[Walter Roberson]

text(2.15,275,txt)

Alternately instead of assigning anything to txt use

text(2.15,275,sprintf('%d',y))

[Michael Armstrong]

Thanks again, Walter Robinson. The text is appearing behind the background of the plot, and I should include "delete(y)" at the end of the loop. I'll comment again once I've fixed the issue.

[Walter Roberson]

if exist('lab', 'var') && ishghandle(lab); delete(lab); end
lab = text(2.15,275,sprintf('%d',y));

WIth regards to it appearing behind the plot: use a z coordinate in the text() call.