Writting the angle on the tip of the arrow in compass function

Question

Ahmed Siddig 2018-6-10

评论： Ahmed Siddig 2018-6-11

Hello,

am using the compass function to plot the direction of (x,y) vectors and i changed the degrees from [0 45 90 ...] to [E NE N ...] using

pax = gca;
angles = 0:45:360;
pax.ThetaTick = angles;
labels = {'E','NE','N','NW','W','SW','S','SE'};
pax.ThetaTickLabel = labels;

so in addition to that i want to write the angle of the vector on the tip of the arrow can you help me out?

thanks.

Walter Roberson 2018-6-10

Are you using the polar.m hack I posted at https://www.mathworks.com/matlabcentral/answers/404890-specify-regions-in-compass?s_tid=prof_contriblnk#comment_576975 ? I ask because compass() normally produces a cartesian axes which does not have a ThetaTickLabel property.

Ahmed Siddig 2018-6-11

Am using the final piece of code you provided me with

set(gca, 'ThetaLim', [225, 315])

thank you very much for that. i have the angle value (V) i just want to make it on the tip of the arrow. much appreciated.

Answer 1

Walter Roberson 2018-6-11

[th, r] = cart2pol(x, y);
text(th, r, sprintfc('%d',round(th(:)*180/pi)))

Here I round the angle to the nearest degree.

Ahmed Siddig 2018-6-11

Thank you so much MR. Roberson. Sorry for troubling you.