How to plot 1 point on a graph.

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Nhut Ngo
Nhut Ngo 2020-3-7
回答： Image Analyst 2020-3-7
Hi guys,
I'm trying to plot just 1 dot on the graph at x coordinate of 29.08882087 but I'm stuck with it. Could anyone help me with that please? Thank you.

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回答（2 个）

Ameer Hamza
Ameer Hamza 2020-3-7
You can pass more inputs to plot function to tell it just to plot a point. For example,
plot(29.08882087, y_coordinate, '.', 'MarkerSize', 30)
replace the value of y_coordinate to specify the location of point on y-axis.
Image Analyst
Image Analyst 2020-3-7
Try this:
c = 23892.80076;
k = 4099768.2;
m = 2000;
Y = 0.1;
w = (0:100);
X = Y*((k^2 + (c.*w).^2) ./ ((k-m.*(w.^2)).^2 + (c .* w).^2)).^0.5;
plot(w, X, 'b-', 'LineWidth', 2);
grid on;
xlabel('w', 'FontSize', 15);
ylabel('X', 'FontSize', 15);
% Plot point at w = 29.08882087
w = 29.08882087;
X = Y*((k^2 + (c.*w).^2) ./ ((k-m.*(w.^2)).^2 + (c .* w).^2)).^0.5;
hold on;
plot(w, X, 'r.', 'LineWidth', 2, 'MarkerSize', 25);

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