How can I calculate the slope of segments given the coordinates?

I did linear fit on the data, and I obtained five segments (AB, BC, CD, DE and EF) with X1 and Y1 vector (coordinates for the segments). I want to calculate the slope of each segment with the data contained in the X1 and Y1:

%slopes=(y2_y1)./(x2-x1);

for i=1:size(YI,2);
y(:,1) = YI(2,2)-YI(1,1);
end

for i=1:size(XI,2);
x(:,1) = XI(2,2)-XI(1,1);
end

slopes=y/x;

Answer 1

[Walter Roberson]

slopes = y./x;