Query regarding Quiver plot

Dear all,

I have data (distance, frequency, arrow amplitude and direction) at several stations along a profile. I want to make induction arrows pseudosection (Distance vs frequency and corresponding arrow behaviour). I used quiver command in matlab. Here, my y axis in log scale and x axis is normal. I am unable get arrows in a proper manner. Kindly guide me.

Thanking you

Vijay

Answer 1

[KSSV]

Get the components first and then use quiver.

u = amplitude.*cos(direction) ;   % be cautious of units of direction/ angle 
v = amplitude.*sin(direction) ; 
quiver(distance, frequency, u,v)

[Vijayakumar Pachigolla]

Dear KSSV,

Thank you for your quick response.

I have already used in the following way

u = AmpliR .* cos(thetaR);

v = AmpliR .* sin(thetaR);

quiver(repmat(x(p,1),length(freq1),1),1./freq1,u,v);

set(gca,'YScale','log');

set(gca,'Ydir','reverse');

ylim([0.001,1000])

set(gca,'YTick', [0.001,0.01,0.1,1,10^1,10^2,10^3,10^4,10^5]);

My frequency is in log scale. But, I am unable to get log scale. If I use 'Y scale' in log. the following error is coming.

Warning: Error updating Quiver.

DataSpace or ColorSpace transform method failed.

Kindly help me in this regard.

Thanking you

Vijay