MATLAB: Data extract from graph.

data acquisitiongraph

I have a plot I created in matlab using excel data. I would like my code to provide a Y value for the X value that I provide. Is this possible? Please note that i cannot look for the Y value, the code should automatically assign the Y value from the graph for provided X value.
Thanks for the Help.

Best Answer

  • Providing that x is monotonic:
    h = findobj(gca, '-property', 'XData');
    hx = h.XData;
    hy = h.YData;
    [shx, idx] = sort(hx);
    shy = hy(hx);
    corresponding_y = interp1(shx, shy, given_x);