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Jeromelei
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jjdg: ½ð±Ò+3, ¸Ðл²ÎÓë 2017-08-23 12:00:47
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jjdg: ½ð±Ò+3, ¸Ðл²ÎÓë 2017-08-23 12:00:47
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Assume you use matlab % Generate an example input data dt = 0.0001; t = -0.05 : dt : 0.05; t0 = 0 : dt : 1/150; f75Hz_p = [zeros(1, length(t(1) : dt : t0(1) - dt)), sin(2*pi*75*t0), zeros(1, length(t0(end) + dt : dt : t(end)))]; f75Hz_n = -[zeros(1, length(t(1) : dt : t0(1) - dt)), sin(2*pi*75*t0), zeros(1, length(t0(end) + dt : dt : t(end)))]; % Plot the data without any legend figure(1); plot(t, f75Hz_p, 'k-'); hold on; plot(t, f75Hz_n, 'k:'); % By default, Matlab does not provide the legend property you want % Therefore, you could use annotation textarrow property instead % x and y are original positions for the textarrow, dx is used for % incremental length of the textarrow x = 0.15; y = 0.8; dx = 0.1; % Drawing (headless) text arrows, so that one of them can have % a string properly which is your legend entry label. Use x,y,dx % for positioning annotation('textarrow', [x,x+dx], [y,y], ... 'linestyle', '-', 'color', 'k', 'textcolor', 'k', 'headstyle', 'none') annotation('textarrow', [x+dx+0.005, x+2*dx+0.005], [y,y], ... 'linestyle', ':', 'color', 'k', 'textcolor', 'k', 'headstyle', 'none') annotation('textarrow', [x + 2*dx + 0.07, x + 3*dx], [y y], ... 'linestyle', 'none', 'textcolor', 'k', 'headstyle', 'none', 'string', '75Hz') |
2Â¥2017-08-23 03:38:31











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