Problem using quiver comand

I have two 360*180*12 matrices with meteorological data and it's significance; I want to plot the data and use quiver to draw arrows where that dada is significative:

    figure
for i=1:12 
subplot(4,3,i);imagescnan(loni,lati,squeeze(double(r4_sat(:,:,i)))'),colorbar;
hold on
subplot(4,3,i);quiver(loni,lati,r4_sat_significative, r4_sat_significative ),colorbar;

This is the code I am triying to use; draw one of the matrices and quiver the other on top; this gives me an error. Can someone please tell me how to represent it properly?

Answer 1

[Cyril GADAL]

Hello,

Can you give us the error you obtain ? Thus, you should probably write it this way :

figure
for i=1:12 
  subplot(4,3,i);
  imagescnan(loni,lati,squeeze(double(r4_sat(:,:,i)))')
  colorbar
  hold on
  quiver(loni,lati,r4_sat_significative, r4_sat_significative )
end

Don't forget the end at the end for the loop. Also, be carefull with the double use of colorbar, even if there is probably a way to have two colobar, I don't see why you want ... I assume that the colorbar is for the image you want to plot ?

[Jaime de la Mota]

It seems that it needs all four components to have the same size, but loni is a vector of 360 longitudes, lati is a vector of 180 latitudes and r4_sat_significative is a 360x180x12. It tells me that r4_sat_significative and loni should have the same dimensions.

[Cyril GADAL]

I think the error probably comes from the fact you forgot the i in r4_sat_significative :

figure
for i=1:12 
  subplot(4,3,i);
  imagescnan(loni,lati,squeeze(double(r4_sat(:,:,i)))')
  colorbar
  hold on
  quiver(loni,lati,r4_sat_significative(:,:i), r4_sat_significative(:,:,i) )
end

You can keep loni and lati as vectors, it should work.