Why is theta=0 not on top

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Heidi Hirsh
Heidi Hirsh 2019-6-4
评论： Walter Roberson 2019-6-5
I am tryin to plot polar histograms of currents. For some reason 90 degrees is plotting on top. Even thought I define the direction as clockwise and zero on top. Does anyone know why this is happening?
%% June 12-17
clear t1; clear t2; clear k1; clear k2;
t1=datenum(2018,06,12,00,00,00);
t2=datenum(2018,08,07,00,00,00);
k1 = find(abs(t1-time) == min(abs(t1-time)));
k2 = find(abs(t2-time) == min(abs(t2-time)));
f1=figure(1)
clear wind_direction; clear wind_speed
direction = PKdir(k1:k2);
speed = PKmag(k1:k2);
% direction = PKdir;
% speed = PKmag;
polarhistogram(deg2rad(direction(speed<.28)),deg2rad(0:10:360),'FaceColor','r','displayname','.12-.28 m/s','Normalization','probability')
hold on
polarhistogram(deg2rad(direction(speed<.12)),deg2rad(0:10:360),'FaceColor','y','displayname','.09-.12 m/s','Normalization','probability')
polarhistogram(deg2rad(direction(speed<.09)),deg2rad(0:10:360),'FaceColor','g','displayname','.06-.09 m/s','Normalization','probability')
polarhistogram(deg2rad(direction(speed<.06)),deg2rad(0:10:360),'FaceColor','b','displayname','.03-.06 m/s','Normalization','probability')
polarhistogram(deg2rad(direction(speed<.03)),deg2rad(0:10:360),'FaceColor','m','displayname','0-.03 m/s','Normalization','probability')
pax.ThetaDir = 'clockwise';
pax.ThetaZeroLocation = 'top';
Ax = gca;
RT = Ax.RTick;
Ax.RTickLabel = compose('%2d%%', RT*100);
legend('Show','fontsize',16)
title('PK: June 12 - June 17','fontsize',16)

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采纳的回答

Akira Agata
Akira Agata 2019-6-5
After "Ax = gca;" in your code, please add the following two lines.
Ax.ThetaDir = 'clockwise';
Ax.ThetaZeroLocation = 'top';
  1 个评论
Walter Roberson
Walter Roberson 2019-6-5
pax is not defined in the code, so it might not have any relationship to the current axes. It might not be defined at all, in which case pax.ThetaDir = 'clockwise' might simply be a structure assignment.

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