I have plotted the response of a Filter using "freqs()". Now, I want to highlight the points on the plot corresponding to Y=0.1 and Y=0.1. Please suggest me how to do it. Any help will be greatly appreciated.
Hi
Lets say you have a curve, and you know one point which you want to highlight. Then simply plot that point with different marker.
Ex.
a = fspecial('gaussian', [100 1],0.9); % Gaussian distriubution.
plot(a); % you will see Gaussian curve. Now I want to highlight the maximum value.
[y x] = max(a);
hold on; % hold the plot for other curves
plot(x,y,'o','MarkerSize',10);
Regards
There are multiple ways to do this. Two of them are stated above by Jinfeng Li and Md Sazal Miah.
Alternatively, you can also use Plot Edit Mode after you plot the graph on MATLAB. Use this guide:
http://matlab.izmiran.ru/help/techdoc/creating_plots/plot_t14.html#33847
But if you really want to have more control over the graphs, you should use a graph plotting software such as Origin. They produce amazing visualizations.
Niloy Sikder , Md Sazal Miah , Jinfeng Li I have attached the graph. Now, I just want to Mark/highlight the point on the curve corresponding to Y=0.7 and Y=0.1. Now please help me exactly what do I have to do.
Niloy Sikder Thnx a lot for this video. It helped me to determine those required points. But, now I need to do this completely by Coding only, so that directly this points get highlighted on executing.
Possibly you want this : first figure. Then use the code below. If both x and y values are available then simply use plot(x,y). But here only y values are available, corresponding x values need to be determined. Since there is no equation, y values cannot be used to solve for x. Therefore, use a loop to identify the x-axis values (w) around a specified y value, say y = 1. Use a large number of frequency values (w). If number of points in w is small, then the required y value may not actually correspond to an actual point on the curve. See second figure. There is no point for y = 1, so the nearest neighbouring point is selected.
w = 1:.01:3; h = freqs(b,a,w); y = abs(h);
plot(w,y, '.'), grid on; hold on;
% identify point on curve for y=1
for i=1:numel(y)
if y(i)< 1.01, break; end
end
scatter(w(i), y(i), 30, 'r', 'filled')
xlabel 'Frequency \omega (rad/sec)', ylabel 'Magnitude y'
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