Matrix data plot

I have 4 vectors, x1,y1,x2,y2. where x1 and y1 represent starting points and x2 and y2 are end points of lines, which I want to plot. Each i-th pair [x1(i), y1(i) x2(i) y2(i)] represents new separated line.

I would like to execute the plotting with a single plot command. I plot my data with set(h1,'xdata',...,'ydata',...) command for speed optimization. Is it possible to execute the plotting with a single plot command ?

I appreciate your help!

Answer 1

[the cyclist]

The best way is to use x and y as data sources. I don't have much experience with this, but here is a working example. I tried to initialize with (0,0) or empty sets for x and y, but that choked for reasons that I do not understand. Maybe this will get you started, though.

x1 = rand(8,1);
x2 = rand(8,1);
x = [x1 x2]';

y1 = rand(8,1);
y2 = rand(8,1);
y = [y1 y2]';

figure
h = plot(x,y,'XDataSource','x','YDataSource','y');

for np = 1:10,

      x1 = rand(8,1);
      x2 = rand(8,1);
      x = [x1 x2]';

      y1 = rand(8,1);
      y2 = rand(8,1);
      y = [y1 y2]';

      refreshdata(h,'caller')
      drawnow
      pause(0.5)

end

[Gustl]

Cyclist, thank you very much for your help ! Works like a charm!

Answer 2

[the cyclist]

Does this do what you mean?

x1 = rand(8,1);
x2 = rand(8,1);

y1 = rand(8,1);
y2 = rand(8,1);

plot([x1 x2]',[y1 y2]')

Answer 3

[Gustl]

Thank you very much for the answer. Yes, this does exactly what I want to do. But the problem is, if I want to make the plot faster by setting the data to the plot handle, it reports "Value must be a column or row vector"..

So this is my code:

figure
h1=plot(0,0,'r-');hold on;
x1 = rand(8,1);
x2 = rand(8,1);
y1 = rand(8,1);
y2 = rand(8,1);

plot([x1 x2]',[y1 y2]'); %this does what i want to do
set(h1,'xdata',[x1 x2]','ydata',[y1 y2]') % this doens't work

Any ideas?

Answer 4

[Gustl]

I've also tried by assigning the variable to the properties "xdatasource" and "ydatasource" by using

h1=plot(0,0,'r-');
x1 = rand(8,1);
x2 = rand(8,1);
y1 = rand(8,1);
y2 = rand(8,1);

xx=[x1 x2]';yy=[y1 y2]';
set(h1,'xdatasource','xx','ydatasource','yy');
refreshdata;

...but still without success...Is it somehow possible to get the this work?

[Sean de Wolski]

h = plot([x1 x2]',[y1 y2]')

You will see that h is a vector with a handle to each line data point. You could manually set the xdata/ydata for each line, this would likely be fast.

I would use a for-loop to generate n lines, each with it's own xdata/ydata.