I am trying to plot a perpendicular at the endpoint of a line in MATLAB. However, I don't think the angle between these two lines is 90 degrees. I know points x1, y1, x2, y2, then
plot([x1 x2],[y1 y2],'r'); hold on; grid on
p = polyfit([x1 x2], [y1 y2], 1); % get line parameters
m = p(1); % get slope
m=-1/m; % calculate perpendicular slope
y=-55.5:0.02:-54.8;
x=x1+((y-y1)./m);
plot(x,y,'g');
axis square;
However, in the plot, it does not show 90 degree angle. What am I doing wrong here. Thanks.
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