# loop for sum in matrix

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Mingde on 20 Jul 2022
Edited: Mingde on 20 Jul 2022
Hello
I want to using loop for do this work. matrix shape(16x10)
converting sum matrix from 2000->200->5 (5x40x10)
i have M1 = [1 2 3 4 .... 2000]
i want to sum each 10 index so the total index is 200, M2=[1+2+3+...+10, 11+12+...20, 21+22+23+...+30, ... ,1991+1992+...2000]
So M3= [55, 155, 255,....+19955]
and I want to sum each 40 index so the total index is 5, M4=[.... , ..... ,.... ,.... ,.... ]
one more thing, I want to make matrix overlab
from 2000->200->40->5
KSSV on 20 Jul 2022
Mingde on 20 Jul 2022
Edited: Mingde on 20 Jul 2022
I know about reshape(I don't want to change shape), but in this work is using for loop.

SAI SRUJAN on 20 Jul 2022
Hi Mingde,
From my understanding of your question,you want to find m4 using for loops.The following code might help,
m1=1:2000;
m2=[];
sum=0;
for i=1:2000
sum=sum+m1(i);
if rem(i,10)==0
m2=[m2 sum];
sum=0;
end
end
m4=[];
for i=1:200
sum=sum+m2(i);
if rem(i,40)==0
m4=[m4 sum];
sum=0;
end
end
Mingde on 20 Jul 2022
ok, let's me try this code.