How do I connect points in a scatter plot with a line?

Hi

I plot a scatter for multiple points and i want to connect them using line. Below is my code. The plot i get is only scatter, I cant connect them through a line. Any help appreciated!

x=[1,2,3,4,5,6,7,8,9];

y=[1,2,3,4,5,6,7,8,9];

hold all

for i=1:8

scatter(x(i),y(i),'X')

line(x(i),y(i))

end

Thanks

Matt

Answer 1

[Ben11]

If you want to plot both markers and a line, you can use the plot function and specify a line style that includes marker symbols and a line style, such as '-x'. For example, this code plots a line with crosses at the data points.

plot(x,y,'-x')

If you are trying to plot only the first eight points, then use this code instead:

plot(x(1:8),y(1:8),'-x')

If you are plotting from a cell array, then use this code instead:

plot(cell2mat(x(1:8)),cell2mat(y(1:8)),'-x')

[Matt]

Thanks! It works :)

[Ben11]

Great! You can accept John's answer as I kind of use his to answer your question. Glad it helped!

Answer 2

[John D'Errico]

You asked this question before! In fact, you asked exactly that question, but for some reason nobody managed to give a good answer.

plot(x(1:8),y(1:8),'b-x')

There is NO need for a loop. The above single line will plot x marks at each point, and connect them with a line, all in blue.

If you prefer to plot the line in blue, and the x marks in red, this will do it:

plot(x(1:8),y(1:8),'b-',x(1:8),y(1:8),'rx')

[Matt]

Thank you John! For ur undersnatding!

I try to ask my question here with simple way. The actual problem I have here is a bit complex. I am ploting data from Cell. That means:-

hold all

for i=1:8

scatter(x{1,i},y{1,i},'X')

line(x{1,i},y{1,i})

end

I try like this according to your previous answer!

plot(x{1,(1:8)},y{1,(1:8)},'X')

But it says me "Too many input arguments" I have spend too much time on this. I cant get the trick!!

[H ZETT M]

Hey, this question is pretty old,but I want to know something similar. I got scattered points on a 2D surface and I want just to connect those points that are close to each other. Basically I want to say something like "connect the points that are in a range of 10m to each other" Any ideas how to do this ?

[John D'Errico]

@ZETT: This is a TOTALLY different question. Ask it as a question. A separate and new question.

Answer 3

[Brian B]

Don't use a for loop:

x=[1,2,3,4,5,6,7,8,9];
y=[1,2,3,4,5,6,7,8,9];

hold on
scatter(x,y,'X')
line(x,y)

or just

   plot(x,y,'-o')

[John D'Errico]

Both of you have missed that for some reason, he wants to plot the first 8 elements.