Connect points to the straight line

Hi everybody,

How can I connect the points to the straight line in the figure ?

Thanks

[David Hill]

Are you talking about a stem() plot? Look at the stem() function.

[Linda Scarzanella]

yes, I checked and it works for me! Do you know if there's a way to show the distance from the point to the line? (or the point value, cuz I'd like to have it directly on the plot)

Answer 1

[Star Strider]

Try this (with your own data):

x = 1:10;                                           % Create Data
y = 2.5*rand(size(x));                              % Create Data
stln = 0;

figure
plot(x, stln+zeros(size(x)), '-r')                 % Straight Line
hold on
plot(x, y, 'xk')                                    % Points
plot([x; x], [zeros(size(y))+stln; y], '-g')        % Connecting Lines
hold off
ptlbls = compose('  %2.1f', y);
text(x, y, ptlbls, 'HorizontalAlignment','left', 'VerticalAlignment','middle')
axis([0  11    -0.1  2.5])

Make appropriate changes to use it with your data.

[Linda Scarzanella]

it doens't work. the error 'vectors must be the same length' comes out. I think the problem is the 'connecting lines' line

[Star Strider]

It works with my test data, or I would not have posted it. I would have to see your code and data to determine what the problem is.

If you want to use the stem function instead:

figure
stem(x, y)
ptlbls = compose('  %2.1f', y);
text(x, y, ptlbls, 'HorizontalAlignment','left', 'VerticalAlignment','middle')

If the horizontal line is something other than at 0, use the BaseValue name value pair to specify it, and use ShowBaseLine. to turn it 'on' or 'off'.

[Linda Scarzanella]

The problem was that my data were an array of 10 rows and 1 column. I switched them to 1 row and 10 col. and it worked ! Thanks again!!

[Star Strider]

My pleasure!

If my Answer helped you solve your problem, please Accept it!

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