# How to plot contourf using following information?

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UTKARSH VERMA on 7 Jan 2021
Commented: UTKARSH VERMA on 7 Jan 2021
I am having data as follows:
lon 256*1double
lat 128*1double
time 3654*1double
pr 256*128*3654double
I am using contourf(lon,lat,pr(:,:,:)) or contourf(lon,lat,pr(:,:,:)') but there is error of dimension

KSSV on 7 Jan 2021
pr is a 3D matrix, you cannot use contourf on a 3D matrix. You need to draw layer by layer.
[m,n,p] = size(pr) ;
for i = 1:p
contourf(lon,lat,pr(:,:,i)) ; % if throws error, trispose pr
drawnow
end
Also have a look on slice.
UTKARSH VERMA on 7 Jan 2021
Thank you!

Bjorn Gustavsson on 7 Jan 2021
You would have to make one contour-plot for each time-step:
i_time = 1;
contourf(lon,lat,pr(:,:,i_time)')
If I understood the dimensions correctly. So to get all you'll have to "animate" in some fashion. What gives the best illustration of what's going on depends on what's going on (a tautology, I know) so you have to be prepared to try different ideas to see what works best. I can for example imagine something like this working:
for i_time = 1:(size(pr,3)-3)
contour(lon,lat,pr(:,:,i_time)',10,'b')
hold on
contour(lon,lat,pr(:,:,i_time+1)',10,'c')
contour(lon,lat,pr(:,:,i_time+2)',10,'g')
contour(lon,lat,pr(:,:,i_time+3)',10,'r')
hold off
drawnow
end
HTH
UTKARSH VERMA on 7 Jan 2021
Thank you!

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