# How to make lines at given angles?

6 views (last 30 days)
Mariam Shahab on 21 Dec 2022
Commented: Mariam Shahab on 21 Dec 2022
Hi all,
Im trying to make 5 lines at the following angles: 90, 180, 270, and 360 degrees.
This is my code so far:
angle=0;
lineLength2 = 20;
angle=[90:90:360];
k=15;
l=12;
plot(k,l); % this is the center. All five lines start from here.
hold on;
e= k + lineLength2*cosd(angle(1));
h= l + lineLength2*sind(angle(1));
plot([k l], [e h]);
hold off;
Can someone kinldy guide me how to make a for loop so that 5 lines are contsructed accroding to their respective angles?
Thanks!

Bora Eryilmaz on 21 Dec 2022
Edited: Bora Eryilmaz on 21 Dec 2022
Looks like you are actually looking for 4 lines since angles of 0 and 360 would produce the same lines. But here is the for-loop you want:
lineLength2 = 20;
angle=[90:90:360];
k=15;
l=12;
plot(k,l,'ro'); % this is the center. All five lines start from here.
hold on;
for i = 1:numel(angle)
e = k + lineLength2*cosd(angle(i));
h = l + lineLength2*sind(angle(i));
plot([k e], [l h]);
end
hold off;
Mariam Shahab on 21 Dec 2022
Thank you! That helps.

Midhulesh Vellanki on 21 Dec 2022
you pretty much have it, you just need to loop over the code for generating the lines and plotting, in MATLAB plotting goes as plot(X,Y). plot([k l], [e h]); becomes plot([k e], [l h]);
angle=0;
lineLength2 = 20;
angle=[90:90:360];
k=15;
l=12;
plot(k,l, '*'); % this is the center. use '*' so that it is visible
hold on;
for i=1:4
e= k + lineLength2*cosd(angle(i));
h= l + lineLength2*sind(angle(i));
plot([k e], [l h]);
end
hold off;
Mariam Shahab on 21 Dec 2022
Thank you