MATLAB: Draw the minimal value from the plot

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Let assume we have plot of some function (actually we have plot of the function-values at some sample points). Is it possible to get the minimal function-value from this plot?
Update (better description): I have figure (.fig file) of the plot of some function and I would like to obtain the minimal function-value from the plot in this figure.
Currently I am trying something like that: fighandler = openfig( inName ); yData = get( fighandler, 'YData' );
However, it doesn't work.

Best Answer

h=plot(0,0); %any plot will do
ydata=get(h,'YData');
min(ydata)
%draw a horizontal line with y that minimum 
line(get(gca,'Xlim'),[min(ydata) min(ydata)])
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