Draw a line between two shapes

and i got a matrix like this

x =

    7   1     here i want to draw a line between the blue circle no.1 with the red triangle no.7

    1   1     here i want to draw a line between the blue circle no.1 with the red triangle no.1

    9   2     here i want to draw a line between the blue circle no.2 with the red triangle no.9

    5   2     and so on...

    4   3     .

    8   3     .

    10  4

    7   4

    6   5

    2   5

but i don't know how to do it Thank you! :)

Answer 1

[Image Analyst]

When you plotted the data with plot() or scatter(), you must have had the coordinates. I'll assume they are called xData and yData. And (the poorly named) x is a list of indexes that you want to draw between. So you'd do

hold on;
for row = 1 : size(x, 1)
    x1 = xData(x(row, 1));
    y1 = yData(x(row, 1));
    x2 = xData(x(row, 2));
    y2 = yData(x(row, 2));
    line([x1, x2], [y1, y2], 'LineWidth', 2, 'Color', 'k');
end

[Image Analyst]

I don't care if it's random. The fact is you still have the coordinates or there is no possible way you could have created that plot. So my code will work. If you think you don't have any data, then tell me how you created that plot.