For loop from 4-D to 3-D

yrlst = 2006:2017;

%12 years of data; each file contains daily dataset for 7 months

for i=1:length(yrlst)
    year0 = yrlst(i);
    fname = strcat('ice_drift_',num2str(year0),'_',num2str(year0+1), '_winter.mat')
    tmp = load(fname);
    long1 = tmp.long;
    lat1 = tmp.lat;
    u1 = tmp.uid;
    v1 = tmp.vid;
    flag1 = tmp.flagid;
 
    u(i,:,:,:) = u1; %4-D file contains in the order of [12,7,145,73]
    v(i,:,:,:) = v1; %4-D file contains in the order of [12,7,145,73]
    flag(i,:,:,:) = flag1;   
end

%However i want to save them in [12*7,145,73]

Answer 1

[Matt J]

 u=reshape(u,[],145,73);
 v=reshape(v,[],145,73);