loop for sum in matrix

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]

Read about reshape

[Mingde]

I know about reshape(I don't want to change shape), but in this work is using for loop.

Answer 1

[SAI SRUJAN]

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]

ok, let's me try this code.