如何找到线之间的交点matlab [重复]

A = [1,2;3,4;5,6]
b = [7,8,9]\'
x = A\\b

ginput

[x,y]=ginput;

x

y

line1 = GetLineFromTwoImagePoints(p1, p2);
line2 = GetLineFromTwoImagePoints(q1, q2);
intersection = GetPointFromTwoImageLines(line1, line2);

function line = GetLineFromTwoImagePoints( one, two )
    line = cross([one 1], [two 1]);
end

function point = GetPointFromTwoImageLines( one, two )
    p = cross(one, two);
    point = [p(1)/p(3) p(2)/p(3)];
end