plot several X=const
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Hello,
I have a vector G (with 120 values).
I'd like to plot a vertical line for each value of this vector in a graph having an other curve. How can I do this?
thank you
回答（1 个）
Image Analyst
2014-9-17
Perhaps the stem() function?
g = rand(1, 10);
plot(g, 'ro-', 'LineWidth', 2);
hold on;
stem(g);
4 个评论
José-Luis
2014-9-17
x = 1:100;
y = cos(x .* 2 .* pi ./100);
X = rand(1,10) .* 100;
Y = interp1(x,y,X);
plot(x,y,'r-','Marker','*');
hold on
stem(X,Y)
Image Analyst
2014-9-17
Maxime's "Answer" moved here since it's not an answer to her original question:
ok, thank but it is not that I want exactely:
I mean:
I have a Y vector comprising a set of values (eg Y = (2.5, 34, 65, -12, etc ...) I have another G vector comprising a set of values (eg G = (12.5, 5.789, 4.6102, 21.09, etc ...).
I would like to draw on the same graph the curve defined by the vector Y, and, the vertical lines of equation X = 12.5, X = 5.789, X = 4.6102, X = X 21.09 = ... etc (the values defined by my G vector...
How can I do ?
!!!! Y and G have not the same length
Image Analyst
2014-9-17
编辑：Image Analyst
2014-9-17
How about this:
Y = [2.5, 34, 65, -12]
G = [12.5, 5.789, 4.6102, 21.09]
plot(Y, 'ro-', 'LineWidth', 4);
grid on;
hold on;
stem(G, max(Y)*ones(1, length(G)), 'Marker', 'none', 'LineWidth', 4);
Note: Y and G don't have to have the same number of elements. ALso, you have not defined an X for the Y values so I'm just assuming X is the index number. For the "G" lines, I'm having them go just from 0 up to the max Y value since you gave no indication of where the lines start or stop.
Image Analyst
2014-9-17
Another option to go the full height of the graph is to use line() function:
Y = [2.5, 34, 65, -12]
G = [12.5, 5.789, 4.6102, 21.09]
plot(Y, 'ro-', 'LineWidth', 4);
grid on;
hold on;
yl = ylim();
for k = 1 : length(G)
x = G(k);
line([x, x], yl, 'Marker', 'none', 'LineWidth', 4);
end
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2014-9-17
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