matlab plot(x_data)

Line = get(gca, 'k');
x_data = Line.XData;
y_data = Line.YData;
id = ~(isnan(x_data(:)) | isnan(y_data(:)));
figure; plot(x_data(id), y_data(id))
firstid = find(id, 1);
figure; 
plot(x_data(firstid:(firstid + sum(id) - 1)), y_data(id))

[Walter Roberson]

What is the question?

http://www.mathworks.com/matlabcentral/answers/6200-tutorial-how-to-ask-a-question-on-answers-and-get-a-fast-answer