How to plot a line parallel to a line with a distance of d between them ?
18 vues (au cours des 30 derniers jours)
Afficher commentaires plus anciens
I have a line whose slope is m and y-intercept is c.
I wan to make a parallel line above and below to this line with at a distance of d between them.
Can anyone help ?
0 commentaires
Réponses (2)
Roger Stafford
le 5 Mar 2014
My guess is that where Priya says "a parallel line above and below to this line with at a distance of d between them", the orthogonal distance between them is to be d, not the vertical distance. If so, the equations of the two lines would be:
Line above:
y = m*x + c + d*sqrt(1+m^2);
Line below:
y = m*x + c - d*sqrt(1+m^2);
2 commentaires
Roger Stafford
le 6 Mar 2014
Priya, I suggest you set m equal to a very large number such as m = 100, and make a plot of your three lines (using "axis equal") to see if a vertical displacement by d rather than an orthogonal one is what you are really after. The lines will look much closer together than your d value if a vertical displacement is used.
Iain
le 5 Mar 2014
For where you want to plot it:
x = 0:1:42;
m = 4;
c = -12;
Line 1 =
y1 = m*x + c
Line 2 (above by d)
y2 = m*x + c + d
Line 3 (below by d)
y3 = m*x + c - d
plot(x,y1,x,y2,x,y3)
2 commentaires
jaya prakash
le 2 Déc 2014
Hi
how could you tell that
x = 0:1:42; m = 4; c = -12;
for every line?
for example if i had a set of polygon points say a=[0 0;1 0;1 1;0 1] then how i will get a offset for a square with a distance d=0.1 ?
thanks in advance for helping
jaya prakash
le 2 Déc 2014
Otherwise i will keep my question in a simple way
i have a line from point a(0,0) to b(1,1)
how would i get a offset line at a distance d=0.1 on both sides ?
thanks in advance
Voir également
Catégories
En savoir plus sur Line Plots dans Help Center et File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!