MATLAB: Loop doesn’t work

for looploopmatrix

Hello People :),
I have a 2464×220 matrix with 44 countries represented by 56 rows each and 5 columns each. I want to do some matrix mulitplication and sum the co2 emissions e11 +e21 in the end, but it calculates 44 times the same number(which is correct, but just for 1 country ) . It just gives me the first countries number and repeats it although i am trying to tell matlab to calcluate it for 44 different countries. I did the following:
kk=1:56:2464;
yy=1:5:220;
Co2_CB=ones([44,1]);
for j=kk
    v=j+55;
    r=yy;
    q=r+4;
e11_j=sum(Q(j:v,r:q),'all');
e21_j=Q(1:2464,r:q);
e21_j(j:v,:)=[];
e21_j=sum(e21_j,'all');
Co2_CB(j)=e11_j+e21_j;
end
 
Co2_CB(Co2_CB==0)=[];
Co2_CB(Co2_CB==1)=[];
I dont understandt why matlab does not calculates the other 43 numbers.
Thanks in advance

Best Answer

Note that you can use sepblockfun
https://www.mathworks.com/matlabcentral/fileexchange/48089-separable-block-wise-operations
to do blockwise summation over the 56x5 sub-tiles of Q.
E11=sepblockfun(Q,[56,5],'sum')
This might make it easier to see how to get the restof what you want.
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