\graphing witth multiple functions

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Answer 1

[Shubham Gupta]

Try :

a = gca;
hold on
plot(a.XLim,[560, 560],'m--') % plots horizontal line at y = 560

To find the intersection point at y = 560 with the function data ('ydata' for example below)

indx = find((ydata-560).*([ydata(1),ydata(1:end-1)]-560)<0); % finds index corresponding to intersection points

num_of_intersection = length(indx)
xintersect = xdata(indx)

Let me know if there is any doubt

[Shubham Gupta]

I am sorry, I forgot to mention that I assumed ydata to be a row vector. So, can you please try to define ydata as a row vector before finding indeces for the intersection? Use:

ydata = Plength(:,3)';