Plot connected vertical points with different marks

I have a vector x=[ 1 2 3 4], and a matrix of size: 3x4.

I want to plot something like this:

Update: the number of vertical points can be different (in my example I used 3, but they can be from 2 to 5).

Update 2: "x" mark is not the center, it might happen than "x" mark is lower or higher than the other two points, for a particular x value.

Any ideas?

Answer 1

[Star Strider]

Try something like this —

x=[ 1 2 3 4];
M = rand(3,4);
Mx = max(M);
Mn = min(M);

figure
plot(x, Mx, 'd')
hold on
plot(x, Mn, 'o')
plot([x; x], [Mx; Mn], '--k')
hold off
grid
xlim([0 5])

.I am not certain what the ‘x’ markers in the centres of the lines represent, so I did not include them. However they could llikely be added with one plot call.

.

[Rub Ron]

hi thanks, actually there can be more points than 3 points, So the "x" point is not the center, but an independent point, than can be lower or higher than the other points.

[Kevin Holly]

x = 1:4;
m = [0.4 0.3 0.5 0.4; 0.25 0.25 0.30 0.20; 0.15 0.20 0.11 0.11];

scatter(x,m(1,:),'d')
hold on
scatter(x,m(2,:),'x')
scatter(x,m(3,:),'o')

for i = 1:4
plot([x(i) x(i)],[m(1,i) m(3,i)],'r')
end

xlim([0 5])
ylim([0 0.6])
xlabel('x')
ylabel('y')

[Star Strider]

@Rub Ron — My code can likely be adapted reasonably easily to any size matrix and compatible-size independent variable vector. It would help to have an actual matrix and to know what you want to display. The ‘x’ markers are then just another plot or scatter call within the hold block.

@Kevin Holly — Thank you!

Adding the ‘x’ markers to my previous code —

x=[ 1 2 3 4];
M = rand(3,4);
Mx = max(M);
Mn = min(M);
xv = rand(size(x));

figure
plot(x, Mx, 'd')
hold on
plot(x, Mn, 'o')
plot([x; x], [Mx; Mn], '--k')
plot(x, xv, 'xm', 'MarkerSize',10)                          % Added
hold off
grid
axis([0  5    0  1])                                        % Optional

.

[Rub Ron]

@Kevin Holly thanks!

Answer 2

[Image Analyst]

Try this:

markerSize = 14;
lineWidth = 2;
x = [1 2 3 4]
y = 0.1 + 0.4 * rand(3, 4)
[rows, columns] = size(y)
for col = 1 : columns
	yTop = max(y(:, col));
	yBottom = min(y(:, col));
 	yMid = setdiff(y(:, col), [yTop; yBottom]);
	% Plot line
	plot([x(col), x(col)], [yBottom, yTop], 'b-', 'LineWidth', 3);
	hold on;
	% Plot markers
	plot(x(col), yTop, 'bd', 'LineWidth', lineWidth, 'MarkerSize', markerSize);
	plot(x(col), yBottom, 'bo', 'LineWidth', lineWidth, 'MarkerSize', markerSize);
	plot(x(col), yMid, 'bx', 'LineWidth', lineWidth, 'MarkerSize', markerSize);	
end
grid on;

[Rub Ron]

Hi, thank you. The number of vertical points can be different, from 2 to 5 (in my example I used 3). Can it be generalized? Sorry if I was not explicit.

[Image Analyst]

Yeah, that was not specified. But it looks like you've accepted an answer so I guess you got it all figured out for the case of variable number of rows.