MATLAB: REFLINE ISSUE

line

I am using Matlab R2010b. I want to make a reference line at coordinates x=0 and y=0. I used to do that in Matlab 2009 but now can't do that. It gives me an error message " Undefined function or method 'refline' for input arguments of type 'double'". I changed the data type to single but I am still getting the same message. Could you please tell me hoe I can fix it?

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type ver and check that the statistics toolbox is installed.

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It would be easier if you defined both of your functions in each plot with the same X-data. Then you could use the much more efficient code in How to change axis of graph and interpolate data.

This works for today’s plots (I tested it on all of them):

% GET INFORMATON FROM FIGURE: 
openfig('Figure(7).fig');
h1c = get(gca, 'Children');
Xdc = get(h1c, 'XData');
Ydc = get(h1c, 'YData');
maxlen = max(cell2mat(cellfun(@max, cellfun(@size, Xdc, 'Uni',0),'Uni',0)))
Xd2 = cell2mat(Xdc(2));
Yd2 = cell2mat(Ydc(2));
Xd = Xd2;
Yd1 = cell2mat(Ydc(1));
Yd = [Yd1(1)*ones(size(Xd2)); Yd2];
% CALCULATIONS: 
Ydn = diff(Yd, [], 1);              % Subtract line from curve to create zero-crossings
Zx = circshift(Ydn, [0 1]) .* Ydn;  % Use circshift to detect them
Zxi = find(Zx < 0);                 % Their indices
for k1 = 1:length(Zxi)              % Use interp1(Y,X,0) to get line intercepts as Xzx
    Xzx(k1) = interp1([Ydn(Zxi(k1)-1) Ydn(Zxi(k1))], [Xd(1,Zxi(k1)-1) Xd(1,Zxi(k1))], 0);
end
% PLOT ZERO-CROSSINGS ON FIGURE TO CHECK: 
hold on
plot(Xzx, repmat(Yd(1,1),1,length(Xzx)), '*r')
hold off

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