Scale quiver plots using quiver or quiver2

Question

Jenny 2015-10-23

1
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/250593-scale-quiver-plots-using-quiver-or-quiver2

Or 5m 0314 P43 Quiver.xlsx

I have current speed and direction data in 10 min intervals (attached file).

I would like to quiver the plots (with time along the x-axis)and include a scale which represents the 'speed' of the current.

I have tried using both 'quiver' and 'quiver2' with no success. Quiver2 looks like a great function but I did not manage to get it to work. I also tried quiverscale.m with no good result.

I would greatly appreciate help in correctly scaling the quiver plot.

Jenny

My code so far:

DD_rad = (90-Dir5m).*pi./180;
[x1,y1]=pol2cart(DD_rad,Spd5m);
x2=x1(1:6:end);
y2=y1(1:6:end);
figure
set(gcf,'Units','Normalize','Position',[0.3 0 0.4 0.9])
t = (Date(1) + (1:length(x1))./(24*6))'; % Each element of x1 corresponds to 10min and not a day so need to divide by 24*6 (*60/10) since am adding 1 to every element of x1 to calc. t.
%t2=t(1:2:end); % plot every 2nd element
t2=t(1:6:end); % plot every 6th element
xmin=t(1); 
xmax=t(end); 
scaleFactor=4; % orig 4
%quiver(t2,zeros(size(x2)),x2,y2,'ShowArrowHead','off',scaleFactor); % does not plot with ShowArrowHead - off command.
quiver(t2,zeros(size(x2)),x2,y2,scaleFactor); % plotting every 6th current vector.
ylabel('[m/s]','Fontsize',12);
xlabel('Dato','Fontsize',12);
axis equal
xlim([xmin xmax]);
set(gca,'xtick',t2(1:96:end),'Fontsize',12);
% Change scaling of y-labels:
yTicks = get(gca,'YTick')';
set(gca,'YTickLabel',num2str(yTicks./(scaleFactor))); % scale factor was originally 4
% End scaling
datetick('x','dd.mm','keepticks');
hold off